diff --git a/test cases/common/10 man install/meson.build b/test cases/common/10 man install/meson.build
index 05c52782e..d0f3be880 100644
--- a/test cases/common/10 man install/meson.build	
+++ b/test cases/common/10 man install/meson.build	
@@ -1,4 +1,4 @@
-project('man install', 'c')
+project('man install')
 m1 = install_man('foo.1')
 m2 = install_man('bar.2')
 m3 = install_man('foo.fr.1', locale: 'fr')
diff --git a/test cases/common/101 testframework options/meson.build b/test cases/common/101 testframework options/meson.build
index 827bae76a..4621b3050 100644
--- a/test cases/common/101 testframework options/meson.build	
+++ b/test cases/common/101 testframework options/meson.build	
@@ -1,7 +1,7 @@
 # normally run only from run_tests.py or run_project_tests.py
 # else do like
 # meson build '-Dtestoption=A string with spaces' -Dother_one=true -Dcombo_opt=one -Dprefix=/usr -Dlibdir=lib -Dbackend=ninja -Dwerror=True
-project('options', 'c')
+project('options')
 
 assert(get_option('testoption') == 'A string with spaces', 'Incorrect value for testoption option.')
 assert(get_option('other_one') == true, 'Incorrect value for other_one option.')
diff --git a/test cases/common/106 multiple dir configure file/meson.build b/test cases/common/106 multiple dir configure file/meson.build
index a4615fae8..18408fb25 100644
--- a/test cases/common/106 multiple dir configure file/meson.build	
+++ b/test cases/common/106 multiple dir configure file/meson.build	
@@ -1,4 +1,4 @@
-project('multiple dir configure file', 'c')
+project('multiple dir configure file')
 
 subdir('subdir')
 
diff --git a/test cases/common/108 ternary/meson.build b/test cases/common/108 ternary/meson.build
index 7539d569f..0073a1e4c 100644
--- a/test cases/common/108 ternary/meson.build	
+++ b/test cases/common/108 ternary/meson.build	
@@ -1,4 +1,4 @@
-project('ternary operator', 'c')
+project('ternary operator')
 
 x = true
 one = true ? 1 : error('False branch should not be evaluated')
diff --git a/test cases/common/109 custom target capture/meson.build b/test cases/common/109 custom target capture/meson.build
index 58a69cacc..b7622014a 100644
--- a/test cases/common/109 custom target capture/meson.build	
+++ b/test cases/common/109 custom target capture/meson.build	
@@ -1,4 +1,4 @@
-project('custom target', 'c')
+project('custom target')
 
 python3 = import('python3').find_python()
 
diff --git a/test cases/common/111 pathjoin/meson.build b/test cases/common/111 pathjoin/meson.build
index 1c339dd30..64aa338c0 100644
--- a/test cases/common/111 pathjoin/meson.build	
+++ b/test cases/common/111 pathjoin/meson.build	
@@ -1,4 +1,4 @@
-project('pathjoin', 'c')
+project('pathjoin')
 
 # Test string-args form since that is the canonical way
 assert(join_paths('foo')               == 'foo', 'Single argument join is broken')
diff --git a/test cases/common/113 interpreter copy mutable var on assignment/meson.build b/test cases/common/113 interpreter copy mutable var on assignment/meson.build
index b54fec9f0..d414bfc74 100644
--- a/test cases/common/113 interpreter copy mutable var on assignment/meson.build	
+++ b/test cases/common/113 interpreter copy mutable var on assignment/meson.build	
@@ -1,4 +1,4 @@
-project('foo', 'c')
+project('foo')
 
 a = configuration_data()
 a.set('HELLO', 1)
diff --git a/test cases/common/114 skip/meson.build b/test cases/common/114 skip/meson.build
index 16e29c90e..ead955fde 100644
--- a/test cases/common/114 skip/meson.build	
+++ b/test cases/common/114 skip/meson.build	
@@ -1,3 +1,3 @@
-project('skip', 'c')
+project('skip')
 
 error('MESON_SKIP_TEST this test is always skipped.')
diff --git a/test cases/common/12 data/meson.build b/test cases/common/12 data/meson.build
index b5b1e8a62..d318633b3 100644
--- a/test cases/common/12 data/meson.build	
+++ b/test cases/common/12 data/meson.build	
@@ -1,4 +1,4 @@
-project('data install test', 'c',
+project('data install test',
   default_options : ['install_umask=preserve'])
 install_data(sources : 'datafile.dat', install_dir : 'share/progname')
 # Some file in /etc that is only read-write by root; add a sticky bit for testing
diff --git a/test cases/common/123 custom target directory install/meson.build b/test cases/common/123 custom target directory install/meson.build
index ada9ae119..c3bfa2052 100644
--- a/test cases/common/123 custom target directory install/meson.build	
+++ b/test cases/common/123 custom target directory install/meson.build	
@@ -1,4 +1,4 @@
-project('custom-target-dir-install', 'c')
+project('custom-target-dir-install')
 
 docgen = find_program('docgen.py')
 
diff --git a/test cases/common/136 empty build file/meson.build b/test cases/common/136 empty build file/meson.build
index 73d03974f..807c401f7 100644
--- a/test cases/common/136 empty build file/meson.build	
+++ b/test cases/common/136 empty build file/meson.build	
@@ -1,2 +1,2 @@
-project('subdir with empty meson.build test', 'c')
+project('subdir with empty meson.build test')
 subdir('subdir')
diff --git a/test cases/common/139 mesonintrospect from scripts/meson.build b/test cases/common/139 mesonintrospect from scripts/meson.build
index a83b533e2..7db4be4ef 100644
--- a/test cases/common/139 mesonintrospect from scripts/meson.build	
+++ b/test cases/common/139 mesonintrospect from scripts/meson.build	
@@ -1,4 +1,4 @@
-project('mesonintrospect from scripts', 'c')
+project('mesonintrospect from scripts')
 
 python = import('python3').find_python()
 
diff --git a/test cases/common/140 custom target multiple outputs/meson.build b/test cases/common/140 custom target multiple outputs/meson.build
index 30305056b..abc572813 100644
--- a/test cases/common/140 custom target multiple outputs/meson.build	
+++ b/test cases/common/140 custom target multiple outputs/meson.build	
@@ -1,4 +1,4 @@
-project('multiple outputs install', 'c')
+project('multiple outputs install')
 
 gen = find_program('generator.py')
 
diff --git a/test cases/common/143 list of file sources/meson.build b/test cases/common/143 list of file sources/meson.build
index 819509dd6..40c1b8c95 100644
--- a/test cases/common/143 list of file sources/meson.build	
+++ b/test cases/common/143 list of file sources/meson.build	
@@ -1,4 +1,4 @@
-project('test', 'c')
+project('test')
 
 mod_py = import('python3')
 python = mod_py.find_python()
diff --git a/test cases/common/162 subdir if_found/meson.build b/test cases/common/162 subdir if_found/meson.build
index 2c640cfad..05be94fba 100644
--- a/test cases/common/162 subdir if_found/meson.build	
+++ b/test cases/common/162 subdir if_found/meson.build	
@@ -1,4 +1,4 @@
-project('subdir if found', 'c')
+project('subdir if found')
 
 found_dep = declare_dependency()
 not_found_dep = dependency('nonexisting', required : false)
diff --git a/test cases/common/163 default options prefix dependent defaults/meson.build b/test cases/common/163 default options prefix dependent defaults/meson.build
index 9ca4ec552..ee8019215 100644
--- a/test cases/common/163 default options prefix dependent defaults/meson.build	
+++ b/test cases/common/163 default options prefix dependent defaults/meson.build	
@@ -1 +1 @@
-project('default options prefix dependent defaults ', 'c', default_options : ['sharedstatedir=/sharedstate', 'prefix=/usr'])
+project('default options prefix dependent defaults ', default_options : ['sharedstatedir=/sharedstate', 'prefix=/usr'])
diff --git a/test cases/common/166 yield/meson.build b/test cases/common/166 yield/meson.build
index 9b115696f..e8f210682 100644
--- a/test cases/common/166 yield/meson.build	
+++ b/test cases/common/166 yield/meson.build	
@@ -1,4 +1,4 @@
-project('yield_options', 'c')
+project('yield_options')
 
 subproject('sub')
 
diff --git a/test cases/common/166 yield/subprojects/sub/meson.build b/test cases/common/166 yield/subprojects/sub/meson.build
index 832c13cc2..1c29d8651 100644
--- a/test cases/common/166 yield/subprojects/sub/meson.build	
+++ b/test cases/common/166 yield/subprojects/sub/meson.build	
@@ -1,4 +1,4 @@
-project('subbie', 'c')
+project('subbie')
 
 assert(get_option('unshared_option') == 'three', 'Unshared option has wrong value in subproject.')
 assert(get_option('shared_option') == 'two', 'Shared option has wrong value in subproject.')
diff --git a/test cases/common/176 subproject version/meson.build b/test cases/common/176 subproject version/meson.build
index 071466db7..b98f0cbd5 100644
--- a/test cases/common/176 subproject version/meson.build	
+++ b/test cases/common/176 subproject version/meson.build	
@@ -1,4 +1,4 @@
-project('subproject version', 'c',
+project('subproject version',
   version : '2.3.4',
   license: 'mylicense')
 
diff --git a/test cases/common/176 subproject version/subprojects/a/meson.build b/test cases/common/176 subproject version/subprojects/a/meson.build
index dae31300f..aeb85afdb 100644
--- a/test cases/common/176 subproject version/subprojects/a/meson.build	
+++ b/test cases/common/176 subproject version/subprojects/a/meson.build	
@@ -1,4 +1,4 @@
-project('mysubproject', 'c',
+project('mysubproject',
   version : '1.0.0',
   license : 'sublicense')
 
diff --git a/test cases/common/177 subdir_done/meson.build b/test cases/common/177 subdir_done/meson.build
index 1ed697777..62346a224 100644
--- a/test cases/common/177 subdir_done/meson.build	
+++ b/test cases/common/177 subdir_done/meson.build	
@@ -1,7 +1,7 @@
 # Should run, even though main.cpp does not exist and we call error in the last line.
 # subdir_done jumps to end, so both lines are not executed.
 
-project('example exit', 'cpp')
+project('example exit')
 
 if true
   subdir_done()
diff --git a/test cases/common/191 subproject array version/meson.build b/test cases/common/191 subproject array version/meson.build
index 0870bc498..4e5aebf5a 100644
--- a/test cases/common/191 subproject array version/meson.build	
+++ b/test cases/common/191 subproject array version/meson.build	
@@ -1,3 +1,3 @@
-project('master', 'c')
+project('master')
 
 x = subproject('foo', version : ['>=1.0.0', '<2.0'])
diff --git a/test cases/common/191 subproject array version/subprojects/foo/meson.build b/test cases/common/191 subproject array version/subprojects/foo/meson.build
index f4ff53548..615ee92bd 100644
--- a/test cases/common/191 subproject array version/subprojects/foo/meson.build	
+++ b/test cases/common/191 subproject array version/subprojects/foo/meson.build	
@@ -1 +1 @@
-project('foo', 'c', version : '1.0.0')
+project('foo', version : '1.0.0')
diff --git a/test cases/common/193 feature option disabled/meson.build b/test cases/common/193 feature option disabled/meson.build
index 1a831872a..65d4d7130 100644
--- a/test cases/common/193 feature option disabled/meson.build	
+++ b/test cases/common/193 feature option disabled/meson.build	
@@ -1,4 +1,4 @@
-project('feature user option', 'c',
+project('feature user option',
   default_options : ['auto_features=disabled'])
 
 feature_opts = get_option('auto_features')
diff --git a/test cases/common/202 custom target build by default/meson.build b/test cases/common/202 custom target build by default/meson.build
index 7c81aa254..53f0fe6e9 100644
--- a/test cases/common/202 custom target build by default/meson.build	
+++ b/test cases/common/202 custom target build by default/meson.build	
@@ -1,4 +1,4 @@
-project('custom-target-dir-install', 'c')
+project('custom-target-dir-install')
 
 docgen = find_program('docgen.py')
 
diff --git a/test cases/common/217 test priorities/meson.build b/test cases/common/217 test priorities/meson.build
index 33c6fa382..159d56f79 100644
--- a/test cases/common/217 test priorities/meson.build	
+++ b/test cases/common/217 test priorities/meson.build	
@@ -1,4 +1,4 @@
-project('test priorities', 'c')
+project('test priorities')
 
 test_prog = find_program('testprog.py')
 
diff --git a/test cases/common/232 dependency allow_fallback/meson.build b/test cases/common/232 dependency allow_fallback/meson.build
index b189faf12..32d225f45 100644
--- a/test cases/common/232 dependency allow_fallback/meson.build	
+++ b/test cases/common/232 dependency allow_fallback/meson.build	
@@ -1,4 +1,4 @@
-project('subproject fallback', 'c')
+project('subproject fallback')
 
 foob_dep = dependency('foob', allow_fallback: true, required: false)
 assert(foob_dep.found())
diff --git a/test cases/common/237 fstrings/meson.build b/test cases/common/237 fstrings/meson.build
index 2db2649b5..d686f6b29 100644
--- a/test cases/common/237 fstrings/meson.build	
+++ b/test cases/common/237 fstrings/meson.build	
@@ -1,4 +1,4 @@
-project('meson-test', 'c')
+project('meson-test')
 
 n = 10
 m = 'bar'
diff --git a/test cases/common/238 dependency include_type inconsistency/meson.build b/test cases/common/238 dependency include_type inconsistency/meson.build
index 7f28e25b9..69b5d19ca 100644
--- a/test cases/common/238 dependency include_type inconsistency/meson.build	
+++ b/test cases/common/238 dependency include_type inconsistency/meson.build	
@@ -1,4 +1,4 @@
-project('test', 'c', 'cpp')
+project('test')
 
 foo_dep = subproject('foo').get_variable('foo_dep')
 
diff --git a/test cases/common/238 dependency include_type inconsistency/subprojects/baz/meson.build b/test cases/common/238 dependency include_type inconsistency/subprojects/baz/meson.build
index a6a37750e..4f454e6c3 100644
--- a/test cases/common/238 dependency include_type inconsistency/subprojects/baz/meson.build	
+++ b/test cases/common/238 dependency include_type inconsistency/subprojects/baz/meson.build	
@@ -1,3 +1,3 @@
-project('baz', 'cpp')
+project('baz')
 
 baz_dep = declare_dependency()
diff --git a/test cases/common/238 dependency include_type inconsistency/subprojects/foo/meson.build b/test cases/common/238 dependency include_type inconsistency/subprojects/foo/meson.build
index 51d950346..1ed7011bd 100644
--- a/test cases/common/238 dependency include_type inconsistency/subprojects/foo/meson.build	
+++ b/test cases/common/238 dependency include_type inconsistency/subprojects/foo/meson.build	
@@ -1,4 +1,4 @@
-project('foo', 'c', 'cpp')
+project('foo')
 
 baz_dep = dependency('baz',
     fallback: ['baz', 'baz_dep'],
diff --git a/test cases/common/239 includedir violation/meson.build b/test cases/common/239 includedir violation/meson.build
index 0216be6ef..b84fdf25a 100644
--- a/test cases/common/239 includedir violation/meson.build	
+++ b/test cases/common/239 includedir violation/meson.build	
@@ -1,4 +1,4 @@
-project('foo', 'c')
+project('foo')
 
 # It is fine to include the root source dir
 include_directories('.')
diff --git a/test cases/common/239 includedir violation/subprojects/sub/meson.build b/test cases/common/239 includedir violation/subprojects/sub/meson.build
index 352f4a261..06f45d61b 100644
--- a/test cases/common/239 includedir violation/subprojects/sub/meson.build	
+++ b/test cases/common/239 includedir violation/subprojects/sub/meson.build	
@@ -1,3 +1,3 @@
-project('subproj', 'c')
+project('subproj')
 
 include_directories('.')
diff --git a/test cases/common/240 dependency native host == build/meson.build b/test cases/common/240 dependency native host == build/meson.build
index bdcd93cef..347b1f6f9 100644
--- a/test cases/common/240 dependency native host == build/meson.build	
+++ b/test cases/common/240 dependency native host == build/meson.build	
@@ -1,4 +1,4 @@
-project('foo', 'c')
+project('foo')
 
 if meson.is_cross_build()
   error('MESON_SKIP_TEST Test does not make sense for cross builds')
diff --git a/test cases/common/242 custom target feed/meson.build b/test cases/common/242 custom target feed/meson.build
index 1cda37d75..73351ae45 100644
--- a/test cases/common/242 custom target feed/meson.build	
+++ b/test cases/common/242 custom target feed/meson.build	
@@ -1,4 +1,4 @@
-project('custom target feed', 'c')
+project('custom target feed')
 
 python3 = import('python3').find_python()
 
diff --git a/test cases/common/246 dependency fallbacks/meson.build b/test cases/common/246 dependency fallbacks/meson.build
index aaabaaa0a..b418088cb 100644
--- a/test cases/common/246 dependency fallbacks/meson.build	
+++ b/test cases/common/246 dependency fallbacks/meson.build	
@@ -1,4 +1,4 @@
-project('dependency fallbacks', 'c')
+project('dependency fallbacks')
 
 # pkg-config has 'libpng' but cmake has 'png' and we have a 'png' subproject
 # for platforms that have neither.
diff --git a/test cases/common/26 find program/meson.build b/test cases/common/26 find program/meson.build
index a083d69a3..5d38d0b36 100644
--- a/test cases/common/26 find program/meson.build	
+++ b/test cases/common/26 find program/meson.build	
@@ -1,4 +1,4 @@
-project('find program', 'c')
+project('find program')
 
 if build_machine.system() == 'windows'
   # Things Windows does not provide:
@@ -15,6 +15,7 @@ else
    arguments : ['@INPUT@', '@OUTPUT@'])
 
   generated = gen.process('source.in')
+  add_languages('c', required: true)
   e = executable('prog', generated)
   test('external exe', e)
 endif
diff --git a/test cases/common/34 logic ops/meson.build b/test cases/common/34 logic ops/meson.build
index 897054e74..656fd18e2 100644
--- a/test cases/common/34 logic ops/meson.build	
+++ b/test cases/common/34 logic ops/meson.build	
@@ -1,4 +1,4 @@
-project('logicopts', 'c')
+project('logicopts')
 
 t = true
 f = false
diff --git a/test cases/common/35 string operations/meson.build b/test cases/common/35 string operations/meson.build
index 2ba70b6e1..116fe0b2b 100644
--- a/test cases/common/35 string operations/meson.build	
+++ b/test cases/common/35 string operations/meson.build	
@@ -1,4 +1,4 @@
-project('string formatting', 'c')
+project('string formatting')
 
 templ = '@0@bar@1@'
 
diff --git a/test cases/common/43 subproject options/meson.build b/test cases/common/43 subproject options/meson.build
index d4598b639..a90527294 100644
--- a/test cases/common/43 subproject options/meson.build	
+++ b/test cases/common/43 subproject options/meson.build	
@@ -1,4 +1,4 @@
-project('suboptions', 'c')
+project('suboptions')
 
 subproject('subproject')
 
diff --git a/test cases/common/43 subproject options/subprojects/subproject/meson.build b/test cases/common/43 subproject options/subprojects/subproject/meson.build
index 5000b8643..d00a024ea 100644
--- a/test cases/common/43 subproject options/subprojects/subproject/meson.build	
+++ b/test cases/common/43 subproject options/subprojects/subproject/meson.build	
@@ -1,4 +1,4 @@
-project('subproject', 'c')
+project('subproject')
 
 if get_option('opt')
   error('option set when it should be unset.')
diff --git a/test cases/common/49 custom target/meson.build b/test cases/common/49 custom target/meson.build
index 8e3c9c647..a51e526f6 100644
--- a/test cases/common/49 custom target/meson.build	
+++ b/test cases/common/49 custom target/meson.build	
@@ -1,4 +1,4 @@
-project('custom target', 'c')
+project('custom target')
 
 python = find_program('python3', required : false)
 if not python.found()
diff --git a/test cases/common/56 array methods/meson.build b/test cases/common/56 array methods/meson.build
index 82a51f1fc..d323db8b2 100644
--- a/test cases/common/56 array methods/meson.build	
+++ b/test cases/common/56 array methods/meson.build	
@@ -1,4 +1,4 @@
-project('array methods', 'c')
+project('array methods')
 
 empty = []
 one = ['abc']
diff --git a/test cases/common/59 install subdir/meson.build b/test cases/common/59 install subdir/meson.build
index 59f3b4dc5..13d41bedf 100644
--- a/test cases/common/59 install subdir/meson.build	
+++ b/test cases/common/59 install subdir/meson.build	
@@ -1,4 +1,4 @@
-project('install a whole subdir', 'c',
+project('install a whole subdir',
   default_options : ['install_umask=preserve'])
 
 # A subdir with an exclusion:
diff --git a/test cases/common/61 number arithmetic/meson.build b/test cases/common/61 number arithmetic/meson.build
index e31d7e4e9..f8ab81bec 100644
--- a/test cases/common/61 number arithmetic/meson.build	
+++ b/test cases/common/61 number arithmetic/meson.build	
@@ -1,4 +1,4 @@
-project('number arithmetic', 'c')
+project('number arithmetic')
 
 if 6 + 4 != 10
   error('Number addition is broken')
diff --git a/test cases/common/62 string arithmetic/meson.build b/test cases/common/62 string arithmetic/meson.build
index 194df0d9a..e5f977385 100644
--- a/test cases/common/62 string arithmetic/meson.build	
+++ b/test cases/common/62 string arithmetic/meson.build	
@@ -1,4 +1,4 @@
-project('string arithmetic', 'c', meson_version: '>=0.62.0')
+project('string arithmetic', meson_version: '>=0.62.0')
 
 assert('foo' + 'bar' == 'foobar')
 assert('foo' + 'bar' + 'baz' == 'foobarbaz')
diff --git a/test cases/common/63 array arithmetic/meson.build b/test cases/common/63 array arithmetic/meson.build
index 8b8785afc..7d5f54f01 100644
--- a/test cases/common/63 array arithmetic/meson.build	
+++ b/test cases/common/63 array arithmetic/meson.build	
@@ -1,4 +1,4 @@
-project('array arithmetic', 'c')
+project('array arithmetic')
 
 array1 = ['foo', 'bar']
 array2 = ['qux', 'baz']
diff --git a/test cases/common/64 arithmetic bidmas/meson.build b/test cases/common/64 arithmetic bidmas/meson.build
index c7334b48f..548294b58 100644
--- a/test cases/common/64 arithmetic bidmas/meson.build	
+++ b/test cases/common/64 arithmetic bidmas/meson.build	
@@ -1,4 +1,4 @@
-project('arithmetic bidmas', 'c')
+project('arithmetic bidmas')
 
 if 5 * 3 - 6 / 2 + 1 != 13
   error('Arithmetic bidmas broken')
diff --git a/test cases/common/67 modules/meson.build b/test cases/common/67 modules/meson.build
index ad33ed6d4..1cb42c4e7 100644
--- a/test cases/common/67 modules/meson.build	
+++ b/test cases/common/67 modules/meson.build	
@@ -1,4 +1,4 @@
-project('module test', 'c')
+project('module test')
 
 modtest = import('modtest')
 modtest.print_hello()
diff --git a/test cases/common/69 configure file in custom target/meson.build b/test cases/common/69 configure file in custom target/meson.build
index 0a850a1a6..562013dc9 100644
--- a/test cases/common/69 configure file in custom target/meson.build	
+++ b/test cases/common/69 configure file in custom target/meson.build	
@@ -1,4 +1,4 @@
-project('conf file in custom target', 'c')
+project('conf file in custom target')
 
 subdir('inc')
 subdir('src')
diff --git a/test cases/common/70 external test program/meson.build b/test cases/common/70 external test program/meson.build
index d18ddcde5..811f49773 100644
--- a/test cases/common/70 external test program/meson.build	
+++ b/test cases/common/70 external test program/meson.build	
@@ -1,3 +1,3 @@
-project('test is external', 'c')
+project('test is external')
 
 test('external', find_program('mytest.py'), args : ['correct'])
diff --git a/test cases/common/71 ctarget dependency/meson.build b/test cases/common/71 ctarget dependency/meson.build
index cd11951b2..40f7398fb 100644
--- a/test cases/common/71 ctarget dependency/meson.build	
+++ b/test cases/common/71 ctarget dependency/meson.build	
@@ -1,4 +1,4 @@
-project('custom target dependency', 'c')
+project('custom target dependency')
 
 # Sometimes custom targets do not take input files
 # but instead do globbing or some similar wackiness.
diff --git a/test cases/common/84 plusassign/meson.build b/test cases/common/84 plusassign/meson.build
index ac477e740..b419c6df6 100644
--- a/test cases/common/84 plusassign/meson.build	
+++ b/test cases/common/84 plusassign/meson.build	
@@ -1,4 +1,4 @@
-project('plusassign', 'c')
+project('plusassign')
 
 x = []
 
diff --git a/test cases/common/85 skip subdir/meson.build b/test cases/common/85 skip subdir/meson.build
index 30ede0ea2..e50303875 100644
--- a/test cases/common/85 skip subdir/meson.build	
+++ b/test cases/common/85 skip subdir/meson.build	
@@ -1,3 +1,3 @@
-project('foo', 'c')
+project('foo')
 
 subdir('subdir1/subdir2')
diff --git a/test cases/common/97 find program path/meson.build b/test cases/common/97 find program path/meson.build
index edb649363..23cf95695 100644
--- a/test cases/common/97 find program path/meson.build	
+++ b/test cases/common/97 find program path/meson.build	
@@ -1,4 +1,4 @@
-project('find program', 'c')
+project('find program')
 
 python = import('python3').find_python()
 
diff --git a/test cases/failing/10 out of bounds/meson.build b/test cases/failing/10 out of bounds/meson.build
index f79167578..6917f7a40 100644
--- a/test cases/failing/10 out of bounds/meson.build	
+++ b/test cases/failing/10 out of bounds/meson.build	
@@ -1,4 +1,4 @@
-project('out of bounds', 'c')
+project('out of bounds')
 
 x = []
 y = x[0]
diff --git a/test cases/failing/104 no fallback/meson.build b/test cases/failing/104 no fallback/meson.build
index 0101bb84e..91d6b9370 100644
--- a/test cases/failing/104 no fallback/meson.build	
+++ b/test cases/failing/104 no fallback/meson.build	
@@ -1,2 +1,2 @@
-project('no fallback', 'c')
+project('no fallback')
 foob_dep = dependency('foob', allow_fallback: false, required: true)
diff --git a/test cases/failing/105 feature require/meson.build b/test cases/failing/105 feature require/meson.build
index d976ae8d6..8c47e3763 100644
--- a/test cases/failing/105 feature require/meson.build	
+++ b/test cases/failing/105 feature require/meson.build	
@@ -1,2 +1,2 @@
-project('no fallback', 'c')
+project('no fallback')
 foo = get_option('reqfeature').require(false, error_message: 'frobnicator not available')
diff --git a/test cases/failing/106 feature require.bis/meson.build b/test cases/failing/106 feature require.bis/meson.build
index 08c099c85..4ea65e5e0 100644
--- a/test cases/failing/106 feature require.bis/meson.build	
+++ b/test cases/failing/106 feature require.bis/meson.build	
@@ -1,2 +1,2 @@
-project('no fallback', 'c')
+project('no fallback')
 foo = get_option('reqfeature').require(false)
diff --git a/test cases/failing/108 enter subdir twice/meson.build b/test cases/failing/108 enter subdir twice/meson.build
index 9343233d5..d9bf9f56b 100644
--- a/test cases/failing/108 enter subdir twice/meson.build	
+++ b/test cases/failing/108 enter subdir twice/meson.build	
@@ -1,3 +1,3 @@
-project('subdir2', 'c')
+project('subdir2')
 subdir('sub')
 subdir('sub')
diff --git a/test cases/failing/109 invalid fstring/meson.build b/test cases/failing/109 invalid fstring/meson.build
index 973df3098..7eb3ccf5c 100644
--- a/test cases/failing/109 invalid fstring/meson.build	
+++ b/test cases/failing/109 invalid fstring/meson.build	
@@ -1,3 +1,3 @@
-project('invalid-fstring', 'c')
+project('invalid-fstring')
 
 z = f'invalid fstring: @foo@'
diff --git a/test cases/failing/11 object arithmetic/meson.build b/test cases/failing/11 object arithmetic/meson.build
index 9a7a6565c..34e3a7a5e 100644
--- a/test cases/failing/11 object arithmetic/meson.build	
+++ b/test cases/failing/11 object arithmetic/meson.build	
@@ -1,3 +1,3 @@
-project('object arithmetic', 'c')
+project('object arithmetic')
 
 foo = '5' + meson
diff --git a/test cases/failing/112 cmake executable dependency/meson.build b/test cases/failing/112 cmake executable dependency/meson.build
index bfb03ef20..48d8fcbb6 100644
--- a/test cases/failing/112 cmake executable dependency/meson.build	
+++ b/test cases/failing/112 cmake executable dependency/meson.build	
@@ -1,4 +1,4 @@
-project('cmake-executable-dependency', ['c', 'cpp'])
+project('cmake-executable-dependency', 'c')
 
 if not find_program('cmake', required: false).found()
   error('MESON_SKIP_TEST CMake is not installed')
diff --git a/test cases/failing/12 string arithmetic/meson.build b/test cases/failing/12 string arithmetic/meson.build
index c02a865a4..8bdd4512b 100644
--- a/test cases/failing/12 string arithmetic/meson.build	
+++ b/test cases/failing/12 string arithmetic/meson.build	
@@ -1,3 +1,3 @@
-project('string arithmetic', 'c')
+project('string arithmetic')
 
 foo = 'a' + 3
diff --git a/test cases/failing/122 cmake subproject error/meson.build b/test cases/failing/122 cmake subproject error/meson.build
index d1071bff2..a308239fc 100644
--- a/test cases/failing/122 cmake subproject error/meson.build	
+++ b/test cases/failing/122 cmake subproject error/meson.build	
@@ -1,4 +1,4 @@
-project('cmake-executable-dependency', ['c', 'cpp'])
+project('cmake-executable-dependency')
 
 if not find_program('cmake', required: false).found()
   error('MESON_SKIP_TEST CMake is not installed')
diff --git a/test cases/failing/13 array arithmetic/meson.build b/test cases/failing/13 array arithmetic/meson.build
index 3ddf06092..f43f81cae 100644
--- a/test cases/failing/13 array arithmetic/meson.build	
+++ b/test cases/failing/13 array arithmetic/meson.build	
@@ -1,3 +1,3 @@
-project('array arithmetic', 'c')
+project('array arithmetic')
 
 foo = ['a', 'b'] * 3
diff --git a/test cases/failing/14 invalid option name/meson.build b/test cases/failing/14 invalid option name/meson.build
index b99fd21ad..6312312fc 100644
--- a/test cases/failing/14 invalid option name/meson.build	
+++ b/test cases/failing/14 invalid option name/meson.build	
@@ -1 +1 @@
-project('foo', 'c')
+project('foo')
diff --git a/test cases/failing/18 wrong plusassign/meson.build b/test cases/failing/18 wrong plusassign/meson.build
index dfb9e6d53..af7727a1e 100644
--- a/test cases/failing/18 wrong plusassign/meson.build	
+++ b/test cases/failing/18 wrong plusassign/meson.build	
@@ -1,3 +1,3 @@
-project('false plusassign', 'c')
+project('false plusassign')
 
 3 += 4
diff --git a/test cases/failing/20 version/meson.build b/test cases/failing/20 version/meson.build
index 9a3a851cb..d25a39540 100644
--- a/test cases/failing/20 version/meson.build	
+++ b/test cases/failing/20 version/meson.build	
@@ -1 +1 @@
-project('version mismatch', 'c', meson_version : '>100.0.0')
+project('version mismatch', meson_version : '>100.0.0')
diff --git a/test cases/failing/21 subver/meson.build b/test cases/failing/21 subver/meson.build
index 854f13ce0..ea0f9146a 100644
--- a/test cases/failing/21 subver/meson.build	
+++ b/test cases/failing/21 subver/meson.build	
@@ -1,3 +1,3 @@
-project('master', 'c')
+project('master')
 
 x = subproject('foo', version : '>1.0.0')
diff --git a/test cases/failing/21 subver/subprojects/foo/meson.build b/test cases/failing/21 subver/subprojects/foo/meson.build
index f4ff53548..615ee92bd 100644
--- a/test cases/failing/21 subver/subprojects/foo/meson.build	
+++ b/test cases/failing/21 subver/subprojects/foo/meson.build	
@@ -1 +1 @@
-project('foo', 'c', version : '1.0.0')
+project('foo', version : '1.0.0')
diff --git a/test cases/failing/22 assert/meson.build b/test cases/failing/22 assert/meson.build
index ae3a19ca1..45cff07aa 100644
--- a/test cases/failing/22 assert/meson.build	
+++ b/test cases/failing/22 assert/meson.build	
@@ -1,3 +1,3 @@
-project('failing assert', 'c')
+project('failing assert')
 
 assert(false, 'I am fail.')
diff --git a/test cases/failing/24 int conversion/meson.build b/test cases/failing/24 int conversion/meson.build
index 51f6c7e16..8db72f301 100644
--- a/test cases/failing/24 int conversion/meson.build	
+++ b/test cases/failing/24 int conversion/meson.build	
@@ -1,3 +1,3 @@
-project('int conversion', 'c')
+project('int conversion')
 
 'notanumber'.to_int()
diff --git a/test cases/failing/25 badlang/meson.build b/test cases/failing/25 badlang/meson.build
index f6bf0cca0..a31059b16 100644
--- a/test cases/failing/25 badlang/meson.build	
+++ b/test cases/failing/25 badlang/meson.build	
@@ -1,3 +1,3 @@
-project('badlang', 'c')
+project('badlang')
 
 add_languages('nonexisting')
diff --git a/test cases/failing/26 output subdir/meson.build b/test cases/failing/26 output subdir/meson.build
index 4eb422ce4..c4bd80666 100644
--- a/test cases/failing/26 output subdir/meson.build	
+++ b/test cases/failing/26 output subdir/meson.build	
@@ -1,4 +1,4 @@
-project('outdir path', 'c')
+project('outdir path')
 
 configure_file(input : 'foo.in',
   output : 'subdir/foo',
diff --git a/test cases/failing/27 noprog use/meson.build b/test cases/failing/27 noprog use/meson.build
index e4de42fbd..af31ecee4 100644
--- a/test cases/failing/27 noprog use/meson.build	
+++ b/test cases/failing/27 noprog use/meson.build	
@@ -1,4 +1,4 @@
-project('using not found exe', 'c')
+project('using not found exe')
 
 nope = find_program('nonexisting', required : false)
 
diff --git a/test cases/failing/28 no crossprop/meson.build b/test cases/failing/28 no crossprop/meson.build
index bd3a743d6..915207792 100644
--- a/test cases/failing/28 no crossprop/meson.build	
+++ b/test cases/failing/28 no crossprop/meson.build	
@@ -1,3 +1,3 @@
-project('no crossprop', 'c')
+project('no crossprop')
 
 message(meson.get_cross_property('nonexisting'))
diff --git a/test cases/failing/29 nested ternary/meson.build b/test cases/failing/29 nested ternary/meson.build
index f9c2e5f8a..76364cea6 100644
--- a/test cases/failing/29 nested ternary/meson.build	
+++ b/test cases/failing/29 nested ternary/meson.build	
@@ -1,3 +1,3 @@
-project('nested ternary', 'c')
+project('nested ternary')
 
 x = true ? (false ? 1 : 0) : 2
diff --git a/test cases/failing/3 missing subdir/meson.build b/test cases/failing/3 missing subdir/meson.build
index fef8c4bca..9301c1ec9 100644
--- a/test cases/failing/3 missing subdir/meson.build	
+++ b/test cases/failing/3 missing subdir/meson.build	
@@ -1,3 +1,3 @@
-project('subdir', 'c')
+project('subdir')
 
 subdir('missing')
diff --git a/test cases/failing/30 invalid man extension/meson.build b/test cases/failing/30 invalid man extension/meson.build
index 45eddca40..b3694d5a0 100644
--- a/test cases/failing/30 invalid man extension/meson.build	
+++ b/test cases/failing/30 invalid man extension/meson.build	
@@ -1,2 +1,2 @@
-project('man install', 'c')
+project('man install')
 m1 = install_man('foo.a1')
diff --git a/test cases/failing/31 no man extension/meson.build b/test cases/failing/31 no man extension/meson.build
index bf835713f..33fdd3e52 100644
--- a/test cases/failing/31 no man extension/meson.build	
+++ b/test cases/failing/31 no man extension/meson.build	
@@ -1,2 +1,2 @@
-project('man install', 'c')
+project('man install')
 m1 = install_man('foo')
diff --git a/test cases/failing/33 non-root subproject/meson.build b/test cases/failing/33 non-root subproject/meson.build
index c84dce7f9..65b1d23d1 100644
--- a/test cases/failing/33 non-root subproject/meson.build	
+++ b/test cases/failing/33 non-root subproject/meson.build	
@@ -1,3 +1,3 @@
-project('non-root subproject', 'c')
+project('non-root subproject')
 
 subdir('some')
diff --git a/test cases/failing/34 dependency not-required then required/meson.build b/test cases/failing/34 dependency not-required then required/meson.build
index 1796699e4..54f5a5857 100644
--- a/test cases/failing/34 dependency not-required then required/meson.build	
+++ b/test cases/failing/34 dependency not-required then required/meson.build	
@@ -1,4 +1,4 @@
-project('dep-test', 'c', version : '1.0')
+project('dep-test', version : '1.0')
 
 foo_dep = dependency('foo-bar-xyz-12.3', required : false)
 bar_dep = dependency('foo-bar-xyz-12.3')
diff --git a/test cases/failing/38 prefix absolute/meson.build b/test cases/failing/38 prefix absolute/meson.build
index e2863e79c..6d0114be2 100644
--- a/test cases/failing/38 prefix absolute/meson.build	
+++ b/test cases/failing/38 prefix absolute/meson.build	
@@ -1,2 +1,2 @@
-project('prefix-abs', 'c',
+project('prefix-abs',
   default_options : ['prefix=some/path/notabs'])
diff --git a/test cases/failing/4 missing meson.build/meson.build b/test cases/failing/4 missing meson.build/meson.build
index 18654be2b..20f754c5b 100644
--- a/test cases/failing/4 missing meson.build/meson.build	
+++ b/test cases/failing/4 missing meson.build/meson.build	
@@ -1,3 +1,3 @@
-project('missing meson.build', 'c')
+project('missing meson.build')
 
 subdir('subdir')
diff --git a/test cases/failing/40 custom target plainname many inputs/meson.build b/test cases/failing/40 custom target plainname many inputs/meson.build
index 1bcfc0672..8513bf800 100644
--- a/test cases/failing/40 custom target plainname many inputs/meson.build	
+++ b/test cases/failing/40 custom target plainname many inputs/meson.build	
@@ -1,4 +1,4 @@
-project('plain name many inputs', 'c')
+project('plain name many inputs')
 
 catfiles = find_program('catfiles.py')
 
diff --git a/test cases/failing/41 custom target outputs not matching install_dirs/meson.build b/test cases/failing/41 custom target outputs not matching install_dirs/meson.build
index 765e23764..ed99dba23 100644
--- a/test cases/failing/41 custom target outputs not matching install_dirs/meson.build	
+++ b/test cases/failing/41 custom target outputs not matching install_dirs/meson.build	
@@ -1,4 +1,4 @@
-project('outputs not matching install_dirs', 'c')
+project('outputs not matching install_dirs')
 
 gen = find_program('generator.py')
 
diff --git a/test cases/failing/43 abs subdir/meson.build b/test cases/failing/43 abs subdir/meson.build
index 5425245a7..a8534d0e1 100644
--- a/test cases/failing/43 abs subdir/meson.build	
+++ b/test cases/failing/43 abs subdir/meson.build	
@@ -1,4 +1,4 @@
-project('abs subdir', 'c')
+project('abs subdir')
 
 # For some reason people insist on doing this, probably
 # because Make has taught them to never rely on anything.
diff --git a/test cases/failing/44 abspath to srcdir/meson.build b/test cases/failing/44 abspath to srcdir/meson.build
index 964a19b56..78c612420 100644
--- a/test cases/failing/44 abspath to srcdir/meson.build	
+++ b/test cases/failing/44 abspath to srcdir/meson.build	
@@ -1,3 +1,3 @@
-project('meson', 'c')
+project('meson')
 
 include_directories(meson.current_source_dir())
diff --git a/test cases/failing/5 misplaced option/meson.build b/test cases/failing/5 misplaced option/meson.build
index 883de0f02..a992de569 100644
--- a/test cases/failing/5 misplaced option/meson.build	
+++ b/test cases/failing/5 misplaced option/meson.build	
@@ -1,3 +1,3 @@
-project('misplaced option', 'c')
+project('misplaced option')
 
 option('dummy', type : 'string')
diff --git a/test cases/failing/50 inconsistent comparison/meson.build b/test cases/failing/50 inconsistent comparison/meson.build
index 7694c2cd2..237a157dc 100644
--- a/test cases/failing/50 inconsistent comparison/meson.build	
+++ b/test cases/failing/50 inconsistent comparison/meson.build	
@@ -1,4 +1,4 @@
-project('kwarg before arg', 'c')
+project('kwarg before arg')
 
 # All of these should fail, though only the first one will error out if
 # everything's working correctly.
diff --git a/test cases/failing/55 or on new line/meson.build b/test cases/failing/55 or on new line/meson.build
index 12f27058d..b0bd08efa 100644
--- a/test cases/failing/55 or on new line/meson.build	
+++ b/test cases/failing/55 or on new line/meson.build	
@@ -1,4 +1,4 @@
-project('silent_or', 'c')
+project('silent_or')
 
 if get_option('foo') == 'true'
         or get_option('foo') == 'auto'
diff --git a/test cases/failing/6 missing incdir/meson.build b/test cases/failing/6 missing incdir/meson.build
index 617ee77bb..eb5ba2a7f 100644
--- a/test cases/failing/6 missing incdir/meson.build	
+++ b/test cases/failing/6 missing incdir/meson.build	
@@ -1,3 +1,3 @@
-project('missing incdir', 'c')
+project('missing incdir')
 
 inc = include_directories('nosuchdir')
diff --git a/test cases/failing/60 subproj filegrab/meson.build b/test cases/failing/60 subproj filegrab/meson.build
index f38d6c74c..b5c484cac 100644
--- a/test cases/failing/60 subproj filegrab/meson.build	
+++ b/test cases/failing/60 subproj filegrab/meson.build	
@@ -1,4 +1,4 @@
-project('mainproj', 'c')
+project('mainproj')
 
 # Try to grab a file from a parent project.
 
diff --git a/test cases/failing/62 grab sibling/meson.build b/test cases/failing/62 grab sibling/meson.build
index 60b926a95..5ddc295e9 100644
--- a/test cases/failing/62 grab sibling/meson.build	
+++ b/test cases/failing/62 grab sibling/meson.build	
@@ -1,3 +1,3 @@
-project('master', 'c')
+project('master')
 
 subproject('a')
diff --git a/test cases/failing/62 grab sibling/subprojects/b/meson.build b/test cases/failing/62 grab sibling/subprojects/b/meson.build
index 7c70fe55b..57f261a24 100644
--- a/test cases/failing/62 grab sibling/subprojects/b/meson.build	
+++ b/test cases/failing/62 grab sibling/subprojects/b/meson.build	
@@ -1,3 +1,3 @@
-projecT('b', 'c')
+projecT('b')
 
 message('I do nothing.')
diff --git a/test cases/failing/67 install_data rename bad size/meson.build b/test cases/failing/67 install_data rename bad size/meson.build
index c7cde087d..849bb9aec 100644
--- a/test cases/failing/67 install_data rename bad size/meson.build	
+++ b/test cases/failing/67 install_data rename bad size/meson.build	
@@ -1,3 +1,3 @@
-project('data install test', 'c')
+project('data install test')
 
 install_data(['file1.txt', 'file2.txt'], rename : 'just one name')
diff --git a/test cases/failing/69 dual override/meson.build b/test cases/failing/69 dual override/meson.build
index e5f86baaf..999b8bc14 100644
--- a/test cases/failing/69 dual override/meson.build	
+++ b/test cases/failing/69 dual override/meson.build	
@@ -1,4 +1,4 @@
-project('yo dawg', 'c')
+project('yo dawg')
 
 p = find_program('overrides.py')
 meson.override_find_program('override', p)
diff --git a/test cases/failing/7 go to subproject/meson.build b/test cases/failing/7 go to subproject/meson.build
index 205cc5ecf..0354ce076 100644
--- a/test cases/failing/7 go to subproject/meson.build	
+++ b/test cases/failing/7 go to subproject/meson.build	
@@ -1,3 +1,3 @@
-project('fff', 'c')
+project('fff')
 
 subdir('subprojects')
diff --git a/test cases/failing/70 override used/meson.build b/test cases/failing/70 override used/meson.build
index 61885bba1..128108e30 100644
--- a/test cases/failing/70 override used/meson.build	
+++ b/test cases/failing/70 override used/meson.build	
@@ -1,4 +1,4 @@
-project('overridde an already found exe', 'c')
+project('overridde an already found exe')
 
 old = find_program('something.py')
 replacement = find_program('other.py')
diff --git a/test cases/failing/71 run_command unclean exit/meson.build b/test cases/failing/71 run_command unclean exit/meson.build
index 4bc02ae7b..f6bf895a8 100644
--- a/test cases/failing/71 run_command unclean exit/meson.build	
+++ b/test cases/failing/71 run_command unclean exit/meson.build	
@@ -1,4 +1,4 @@
-project('run_command unclean exit', 'c')
+project('run_command unclean exit')
 
 rcprog = find_program('./returncode.py')
 run_command(rcprog, '1', check : true)
diff --git a/test cases/failing/75 non ascii in ascii encoded configure file/meson.build b/test cases/failing/75 non ascii in ascii encoded configure file/meson.build
index 846daaf89..26da80eab 100644
--- a/test cases/failing/75 non ascii in ascii encoded configure file/meson.build	
+++ b/test cases/failing/75 non ascii in ascii encoded configure file/meson.build	
@@ -1,4 +1,4 @@
-project('non acsii to ascii encoding', 'c')
+project('non acsii to ascii encoding')
 # Writing a non ASCII character with a ASCII encoding should fail
 conf9 = configuration_data()
 conf9.set('var', 'д')
diff --git a/test cases/failing/8 recursive/meson.build b/test cases/failing/8 recursive/meson.build
index f3152946d..0cf9c4756 100644
--- a/test cases/failing/8 recursive/meson.build	
+++ b/test cases/failing/8 recursive/meson.build	
@@ -1,3 +1,3 @@
-project('recursive', 'c')
+project('recursive')
 
 a = subproject('a')
diff --git a/test cases/failing/8 recursive/subprojects/a/meson.build b/test cases/failing/8 recursive/subprojects/a/meson.build
index 7c6040bc6..c368b5ca0 100644
--- a/test cases/failing/8 recursive/subprojects/a/meson.build	
+++ b/test cases/failing/8 recursive/subprojects/a/meson.build	
@@ -1,3 +1,3 @@
-project('a', 'c')
+project('a')
 
 b = subproject('b')
diff --git a/test cases/failing/8 recursive/subprojects/b/meson.build b/test cases/failing/8 recursive/subprojects/b/meson.build
index d0beeb7d9..93b46c0d4 100644
--- a/test cases/failing/8 recursive/subprojects/b/meson.build	
+++ b/test cases/failing/8 recursive/subprojects/b/meson.build	
@@ -1,3 +1,3 @@
-project('b', 'c')
+project('b')
 
 a = subproject('a')
diff --git a/test cases/failing/82 gtest dependency with version/meson.build b/test cases/failing/82 gtest dependency with version/meson.build
index b43a04733..efbffe1e7 100644
--- a/test cases/failing/82 gtest dependency with version/meson.build	
+++ b/test cases/failing/82 gtest dependency with version/meson.build	
@@ -1,4 +1,4 @@
-project('gtest dependency with version', ['c', 'cpp'])
+project('gtest dependency with version', 'cpp')
 
 if not dependency('gtest', method: 'system', required: false).found()
    error('MESON_SKIP_TEST test requires gtest')
diff --git a/test cases/failing/97 subdir parse error/meson.build b/test cases/failing/97 subdir parse error/meson.build
index ee5bb0cb7..a744396ca 100644
--- a/test cases/failing/97 subdir parse error/meson.build	
+++ b/test cases/failing/97 subdir parse error/meson.build	
@@ -1,2 +1,2 @@
-project('subdir false plusassign', 'c')
+project('subdir false plusassign')
 subdir('subdir')