Merge pull request #4573 from jon-turney/msys2-clang

More clang for Windows support

azure-pipelines.yml

@@ -100,7 +100,7 @@ jobs:
         testResultsFiles: meson-test-run.xml
         testRunTitle: $(System.JobName)
 
-- job: msys2_mingw
+- job: msys2
   pool:
     vmImage: VS2017-Win2016
   strategy:
@@ -108,9 +108,15 @@ jobs:
       gccx86ninja:
         MSYSTEM: MINGW32
         MSYS2_ARCH: i686
+        compiler: gcc
       gccx64ninja:
         MSYSTEM: MINGW64
         MSYS2_ARCH: x86_64
+        compiler: gcc
+      clangx64ninja:
+        MSYSTEM: MINGW64
+        MSYS2_ARCH: x86_64
+        compiler: clang
   variables:
     MSYS2_ROOT: $(System.Workfolder)\msys64
   steps:
@@ -124,20 +130,23 @@ jobs:
       displayName: Update MSYS2
     - script: |
         set PATH=%MSYS2_ROOT%\usr\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem
+        if %compiler%==gcc ( set "TOOLCHAIN=mingw-w64-$(MSYS2_ARCH)-toolchain" ) else ( set "TOOLCHAIN=mingw-w64-$(MSYS2_ARCH)-clang" )
         %MSYS2_ROOT%\usr\bin\pacman --noconfirm --needed -S ^
         base-devel ^
         git ^
         mercurial ^
         mingw-w64-$(MSYS2_ARCH)-cmake ^
+        mingw-w64-$(MSYS2_ARCH)-pkg-config ^
         mingw-w64-$(MSYS2_ARCH)-python2 ^
         mingw-w64-$(MSYS2_ARCH)-python3 ^
         mingw-w64-$(MSYS2_ARCH)-python3-setuptools ^
-        mingw-w64-$(MSYS2_ARCH)-toolchain
+        %TOOLCHAIN%
       displayName: Install Dependencies
     - script: |
         set PATH=%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem
         %MSYS2_ROOT%\usr\bin\bash -lc "wget https://github.com/mesonbuild/cidata/raw/master/ninja.exe; mv ninja.exe /$MSYSTEM/bin"
         set PATHEXT=%PATHEXT%;.py
+        if %compiler%==clang ( set CC=clang && set CXX=clang++ )
         %MSYS2_ROOT%\usr\bin\bash -lc "MSYSTEM= python3 run_tests.py --backend=ninja"
       env:
         CHERE_INVOKING: yes

mesonbuild/compilers/compilers.py

@@ -1545,6 +1545,10 @@ class GnuLikeCompiler(abc.ABC):
             # GNU ld and LLVM lld
             return ['-Wl,--allow-shlib-undefined']
 
+    def get_gui_app_args(self, value):
+        if self.compiler_type.is_windows_compiler and value:
+            return ['-mwindows']
+        return []
 
 class GnuCompiler(GnuLikeCompiler):
     """
@@ -1583,11 +1587,6 @@ class GnuCompiler(GnuLikeCompiler):
     def get_pch_suffix(self):
         return 'gch'
 
-    def get_gui_app_args(self, value):
-        if self.compiler_type.is_windows_compiler and value:
-            return ['-mwindows']
-        return []
-
     def openmp_flags(self):
         return ['-fopenmp']
 

run_unittests.py

@@ -1970,6 +1970,11 @@ class AllPlatformTests(BasePlatformTests):
         https://github.com/mesonbuild/meson/issues/1646
         '''
         testdir = os.path.join(self.common_test_dir, '5 linkstatic')
+
+        env = get_fake_env(testdir, self.builddir, self.prefix)
+        if env.detect_c_compiler(False).get_id() == 'clang' and is_windows():
+            raise unittest.SkipTest('LTO not (yet) supported by windows clang')
+
         self.init(testdir, extra_args='-Db_lto=true')
         self.build()
         self.run_tests()
@@ -2188,7 +2193,9 @@ int main(int argc, char **argv) {
                 '/NOLOGO', '/DLL', '/DEBUG', '/IMPLIB:' + impfile,
                 '/OUT:' + outfile, objectfile]
         else:
-            extra_args += ['-fPIC']
+            if not (compiler.compiler_type.is_windows_compiler or
+                    compiler.compiler_type.is_osx_compiler):
+                extra_args += ['-fPIC']
             link_cmd = compiler.get_exelist() + ['-shared', '-o', outfile, objectfile]
             if not mesonbuild.mesonlib.is_osx():
                 link_cmd += ['-Wl,-soname=' + os.path.basename(outfile)]
@@ -3546,7 +3553,7 @@ class LinuxlikeTests(BasePlatformTests):
         is true and not when it is false. This can't be an ordinary test case
         because we need to inspect the compiler database.
         '''
-        if is_cygwin() or is_osx():
+        if is_windows() or is_cygwin() or is_osx():
             raise unittest.SkipTest('PIC not relevant')
 
         testdir = os.path.join(self.common_test_dir, '3 static')
@@ -4757,7 +4764,10 @@ class NativeFileTests(BasePlatformTests):
         # invokes our python wrapper
         batfile = os.path.join(self.builddir, 'binary_wrapper{}.bat'.format(self.current_wrapper))
         with open(batfile, 'wt') as f:
-            f.write('py -3 {} %*'.format(filename))
+            if mesonbuild.environment.detect_msys2_arch():
+                f.write(r'@python3 {} %*'.format(filename))
+            else:
+                f.write('@py -3 {} %*'.format(filename))
         return batfile
 
     def helper_for_compiler(self, lang, cb):
@@ -4802,6 +4812,8 @@ class NativeFileTests(BasePlatformTests):
 
     def test_config_tool_dep(self):
         # Do the skip at this level to avoid screwing up the cache
+        if mesonbuild.environment.detect_msys2_arch():
+            raise unittest.SkipTest('Skipped due to problems with LLVM on MSYS2')
         if not shutil.which('llvm-config'):
             raise unittest.SkipTest('No llvm-installed, cannot test')
         self._simple_test('config_dep', 'llvm-config')

test cases/common/143 C and CPP link/meson.build

@@ -36,7 +36,11 @@ if cxx.get_argument_syntax() == 'msvc'
   compile_cmd = ['/c', '@INPUT@', '/Fo@OUTPUT@']
   stlib_cmd = [static_linker, '/OUT:@OUTPUT@', '@INPUT@']
 else
-  compile_cmd = ['-c', '-fPIC', '@INPUT@', '-o', '@OUTPUT@']
+ picflag = []
+ if not ['darwin', 'windows'].contains(host_machine.system())
+    picflag = ['-fPIC']
+  endif
+  compile_cmd = ['-c', picflag, '@INPUT@', '-o', '@OUTPUT@']
   stlib_cmd = ['ar', 'csr', '@OUTPUT@', '@INPUT@']
 endif
 

test cases/common/190 openmp/meson.build

@@ -13,6 +13,9 @@ endif
 if cc.get_id() == 'clang-cl'
   error('MESON_SKIP_TEST clang-cl does not support OpenMP.')
 endif
+if cc.get_id() == 'clang' and host_machine.system() == 'windows'
+  error('MESON_SKIP_TEST Windows clang does not support OpenMP.')
+endif
 if host_machine.system() == 'darwin'
   error('MESON_SKIP_TEST macOS does not support OpenMP.')
 endif

test cases/common/59 exe static shared/meson.build

@@ -1,8 +1,12 @@
 project('statchain', 'c')
 
 subdir('subdir')
-# Test that -fPIC in c_args is also accepted
-statlib2 = static_library('stat2', 'stat2.c', c_args : '-fPIC', pic : false)
+# Test that -fPIC in c_args is also accepted (on platforms where it's permitted)
+picflag = []
+if not ['darwin', 'windows'].contains(host_machine.system())
+  picflag = ['-fPIC']
+endif
+statlib2 = static_library('stat2', 'stat2.c', c_args : picflag, pic : false)
 # Test that pic is needed for both direct and indirect static library
 # dependencies of shared libraries (on Linux and BSD)
 statlib = static_library('stat', 'stat.c', link_with : [shlib, statlib2], pic : true)

test cases/failing build/2 hidden symbol/meson.build

@@ -1,10 +1,7 @@
 project('hidden symbol', 'c')
 
 if host_machine.system() == 'windows' or host_machine.system() == 'cygwin'
-  cc = meson.get_compiler('c')
-  if cc.get_id() == 'gcc'
-    error('MESON_SKIP_TEST -fvisibility=hidden does not work on MinGW or Cygwin.')
-  endif
+  error('MESON_SKIP_TEST -fvisibility=hidden does not work for PE files.')
 endif
 
 l = shared_library('bob', 'bob.c',

test cases/windows/12 resources with custom targets/meson.build

@@ -3,7 +3,7 @@ project('winmain', 'c')
 # MinGW windres has a bug due to which it doesn't parse args with space properly:
 # https://github.com/mesonbuild/meson/pull/1346
 # https://sourceware.org/bugzilla/show_bug.cgi?id=4933
-if meson.get_compiler('c').get_id() == 'gcc' and host_machine.system() == 'windows'
+if ['gcc', 'clang'].contains(meson.get_compiler('c').get_id()) and host_machine.system() == 'windows'
   # Construct build_to_src and skip this test if it has spaces
   # because then the -I flag to windres will also have spaces
   # and we know the test will fail

test cases/windows/5 resources/meson.build

@@ -3,7 +3,7 @@ project('winmain', 'c')
 # MinGW windres has a bug due to which it doesn't parse args with space properly:
 # https://github.com/mesonbuild/meson/pull/1346
 # https://sourceware.org/bugzilla/show_bug.cgi?id=4933
-if meson.get_compiler('c').get_id() == 'gcc' and host_machine.system() == 'windows'
+if ['gcc', 'clang'].contains(meson.get_compiler('c').get_id()) and host_machine.system() == 'windows'
   # Construct build_to_src and skip this test if it has spaces
   # because then the -I flag to windres will also have spaces
   # and we know the test will fail