Use strict function prototypes

.github/workflows/unusedargs_missingreturn.yml

@@ -1,5 +1,8 @@
 name: UnusedMissingReturn
-# this workflow checks for usused input arguments or missing return values in test cases.
+# this workflow checks for
+# * unused input arguments
+# * missing return values
+# * strict prototypes
 # some users have default configs that will needlessly fail Meson self-tests due to these syntax.
 
 on:
@@ -33,6 +36,6 @@ jobs:
         sudo apt install -yq --no-install-recommends g++ gfortran ninja-build
     - run: python run_project_tests.py --only cmake common fortran platform-linux
       env:
-        CFLAGS: "-Werror=unused-parameter -Werror=return-type"
+        CFLAGS: "-Werror=unused-parameter -Werror=return-type -Werror=strict-prototypes"
         CPPFLAGS: "-Werror=unused-parameter -Werror=return-type"
         FFLAGS: "-fimplicit-none"

manual tests/9 nostdlib/prog.c

@@ -1,7 +1,7 @@
 
 #include<stdio.h>
 
-int main() {
+int main(void) {
   const char *message = "Hello without stdlib.\n";
   return simple_print(message, simple_strlen(message));
 }

mesonbuild/compilers/c.py

@@ -59,14 +59,14 @@ class CCompiler(CLikeCompiler, Compiler):
         return ['-nostdinc']
 
     def sanity_check(self, work_dir, environment):
-        code = 'int main() { int class=0; return class; }\n'
+        code = 'int main(void) { int class=0; return class; }\n'
         return self.sanity_check_impl(work_dir, environment, 'sanitycheckc.c', code)
 
     def has_header_symbol(self, hname, symbol, prefix, env, *, extra_args=None, dependencies=None):
         fargs = {'prefix': prefix, 'header': hname, 'symbol': symbol}
         t = '''{prefix}
         #include <{header}>
-        int main () {{
+        int main(void) {{
             /* If it's not defined as a macro, try to use as a symbol */
             #ifndef {symbol}
                 {symbol};

mesonbuild/compilers/cpp.py

@@ -73,7 +73,7 @@ class CPPCompiler(CLikeCompiler, Compiler):
         return ['-nostdinc++']
 
     def sanity_check(self, work_dir, environment):
-        code = 'class breakCCompiler;int main() { return 0; }\n'
+        code = 'class breakCCompiler;int main(void) { return 0; }\n'
         return self.sanity_check_impl(work_dir, environment, 'sanitycheckcpp.cc', code)
 
     def get_compiler_check_args(self):
@@ -96,7 +96,7 @@ class CPPCompiler(CLikeCompiler, Compiler):
         t = '''{prefix}
         #include <{header}>
         using {symbol};
-        int main () {{ return 0; }}'''
+        int main(void) {{ return 0; }}'''
         return self.compiles(t.format(**fargs), env, extra_args=extra_args,
                              dependencies=dependencies)
 

mesonbuild/compilers/cuda.py

@@ -174,7 +174,7 @@ class CudaCompiler(Compiler):
         t = '''{prefix}
         #include <{header}>
         using {symbol};
-        int main () {{ return 0; }}'''
+        int main(void) {{ return 0; }}'''
         return self.compiles(t.format(**fargs), env, extra_args, dependencies)
 
     def get_options(self):

mesonbuild/compilers/mixins/clike.py

@@ -258,7 +258,7 @@ class CLikeCompiler:
             raise mesonlib.EnvironmentException('Executables created by {0} compiler {1} are not runnable.'.format(self.language, self.name_string()))
 
     def sanity_check(self, work_dir, environment):
-        code = 'int main() { int class=0; return class; }\n'
+        code = 'int main(void) { int class=0; return class; }\n'
         return self.sanity_check_impl(work_dir, environment, 'sanitycheckc.c', code)
 
     def check_header(self, hname, prefix, env, *, extra_args=None, dependencies=None):
@@ -285,7 +285,7 @@ class CLikeCompiler:
         fargs = {'prefix': prefix, 'header': hname, 'symbol': symbol}
         t = '''{prefix}
         #include <{header}>
-        int main () {{
+        int main(void) {{
             /* If it's not defined as a macro, try to use as a symbol */
             #ifndef {symbol}
                 {symbol};
@@ -398,7 +398,7 @@ class CLikeCompiler:
         fargs = {'prefix': prefix, 'expression': expression}
         t = '''#include <stdio.h>
         {prefix}
-        int main() {{ static int a[1-2*!({expression})]; a[0]=0; return 0; }}'''
+        int main(void) {{ static int a[1-2*!({expression})]; a[0]=0; return 0; }}'''
         return self.compiles(t.format(**fargs), env, extra_args=extra_args,
                              dependencies=dependencies)[0]
 
@@ -458,7 +458,7 @@ class CLikeCompiler:
         fargs = {'prefix': prefix, 'expression': expression}
         t = '''#include<stdio.h>
         {prefix}
-        int main() {{
+        int main(void) {{
             printf("%ld\\n", (long)({expression}));
             return 0;
         }};'''
@@ -476,7 +476,7 @@ class CLikeCompiler:
         fargs = {'prefix': prefix, 'type': typename}
         t = '''#include <stdio.h>
         {prefix}
-        int main() {{
+        int main(void) {{
             {type} something;
             return 0;
         }}'''
@@ -494,7 +494,7 @@ class CLikeCompiler:
                                      dependencies=dependencies)
         t = '''#include<stdio.h>
         {prefix}
-        int main() {{
+        int main(void) {{
             printf("%ld\\n", (long)(sizeof({type})));
             return 0;
         }};'''
@@ -512,7 +512,7 @@ class CLikeCompiler:
         fargs = {'prefix': prefix, 'type': typename}
         t = '''#include <stdio.h>
         {prefix}
-        int main() {{
+        int main(void) {{
             {type} something;
             return 0;
         }}'''
@@ -541,7 +541,7 @@ class CLikeCompiler:
             char c;
             {type} target;
         }};
-        int main() {{
+        int main(void) {{
             printf("%d", (int)offsetof(struct tmp, target));
             return 0;
         }}'''
@@ -591,7 +591,7 @@ class CLikeCompiler:
         fargs = {'prefix': prefix, 'f': fname, 'cast': cast, 'fmt': fmt}
         code = '''{prefix}
         #include <stdio.h>
-        int main() {{
+        int main(void) {{
             printf ("{fmt}", {cast} {f}());
             return 0;
         }}'''.format(**fargs)
@@ -634,11 +634,11 @@ class CLikeCompiler:
         #ifdef __cplusplus
         extern "C"
         #endif
-        char {func} ();
+        char {func} (void);
         '''
         # The actual function call
         main = '''
-        int main () {{
+        int main(void) {{
           return {func} ();
         }}'''
         return head, main
@@ -657,7 +657,7 @@ class CLikeCompiler:
         # Just taking the address or comparing it to void is not enough because
         # compilers are smart enough to optimize it away. The resulting binary
         # is not run so we don't care what the return value is.
-        main = '''\nint main() {{
+        main = '''\nint main(void) {{
             void *a = (void*) &{func};
             long b = (long) a;
             return (int) b;
@@ -729,7 +729,7 @@ class CLikeCompiler:
         # can just directly use the __has_builtin() macro.
         fargs['no_includes'] = '#include' not in prefix
         t = '''{prefix}
-        int main() {{
+        int main(void) {{
         #ifdef __has_builtin
             #if !__has_builtin(__builtin_{func})
                 #error "__builtin_{func} not found"
@@ -761,7 +761,7 @@ class CLikeCompiler:
             members += '{}.{};\n'.format(fargs['name'], member)
         fargs['members'] = members
         t = '''{prefix}
-        void bar() {{
+        void bar(void) {{
             {type} {name};
             {members}
         }};'''
@@ -771,7 +771,7 @@ class CLikeCompiler:
     def has_type(self, typename, prefix, env, extra_args, dependencies=None):
         fargs = {'prefix': prefix, 'type': typename}
         t = '''{prefix}
-        void bar() {{
+        void bar(void) {{
             sizeof({type});
         }};'''
         return self.compiles(t.format(**fargs), env, extra_args=extra_args,
@@ -785,7 +785,7 @@ class CLikeCompiler:
         code = '''#ifdef __cplusplus
         extern "C" {
         #endif
-        void ''' + symbol_name.decode() + ''' () {}
+        void ''' + symbol_name.decode() + ''' (void) {}
         #ifdef __cplusplus
         }
         #endif
@@ -993,7 +993,7 @@ class CLikeCompiler:
         return value[:]
 
     def find_library(self, libname, env, extra_dirs, libtype: LibType = LibType.PREFER_SHARED):
-        code = 'int main() { return 0; }'
+        code = 'int main(void) { return 0; }'
         return self.find_library_impl(libname, env, extra_dirs, code, libtype)
 
     def find_framework_paths(self, env):
@@ -1023,7 +1023,7 @@ class CLikeCompiler:
         return paths
 
     def find_framework_real(self, name, env, extra_dirs, allow_system):
-        code = 'int main() { return 0; }'
+        code = 'int main(void) { return 0; }'
         link_args = []
         for d in extra_dirs:
             link_args += ['-F' + d]
@@ -1102,7 +1102,7 @@ class CLikeCompiler:
         # false positive.
         args = self.linker.fatal_warnings() + args
         args = self.linker_to_compiler_args(args)
-        code = 'int main() { return 0; }'
+        code = 'int main(void) { return 0; }'
         return self.has_arguments(args, env, code, mode='link')
 
     @staticmethod

mesonbuild/compilers/objc.py

@@ -48,7 +48,7 @@ class ObjCCompiler(CLikeCompiler, Compiler):
             extra_flags += environment.coredata.get_external_link_args(self.for_machine, self.language)
         with open(source_name, 'w') as ofile:
             ofile.write('#import<stddef.h>\n'
-                        'int main() { return 0; }\n')
+                        'int main(void) { return 0; }\n')
         pc = subprocess.Popen(self.exelist + extra_flags + [source_name, '-o', binary_name])
         pc.wait()
         if pc.returncode != 0:

mesonbuild/compilers/objcpp.py

@@ -48,7 +48,7 @@ class ObjCPPCompiler(CLikeCompiler, Compiler):
         with open(source_name, 'w') as ofile:
             ofile.write('#import<stdio.h>\n'
                         'class MyClass;'
-                        'int main() { return 0; }\n')
+                        'int main(void) { return 0; }\n')
         pc = subprocess.Popen(self.exelist + extra_flags + [source_name, '-o', binary_name])
         pc.wait()
         if pc.returncode != 0:

run_unittests.py

@@ -3047,7 +3047,7 @@ int main(int argc, char **argv) {
             if lang in ('c', 'cpp'):
                 with tempfile.TemporaryDirectory() as tmpdir:
                     with open(os.path.join(tmpdir, 'foo.' + lang), 'w') as f:
-                        f.write('int main() {}')
+                        f.write('int main(void) {}')
                     self._run(self.meson_command + ['init', '-b'], workdir=tmpdir)
 
     # The test uses mocking and thus requires that
@@ -7006,4 +7006,4 @@ def main():
     return unittest.main(defaultTest=cases, buffer=True)
 
 if __name__ == '__main__':
-    sys.exit(main())
+    raise SystemExit(main())

test cases/cmake/1 basic/main.cpp

@@ -3,7 +3,7 @@
 
 using namespace std;
 
-int main() {
+int main(void) {
   cmModClass obj("Hello");
   cout << obj.getStr() << endl;
   return 0;

test cases/cmake/10 header only/main.cpp

@@ -3,7 +3,7 @@
 
 using namespace std;
 
-int main() {
+int main(void) {
   cmModClass obj("Hello");
   cout << obj.getStr() << endl;
   return 0;

test cases/cmake/12 generator expressions/main.cpp

@@ -3,7 +3,7 @@
 
 using namespace std;
 
-int main() {
+int main(void) {
   cmModClass obj("Hello");
   cout << obj.getStr() << endl;
   return 0;

test cases/cmake/13 system includes/main.cpp

@@ -3,7 +3,7 @@
 
 using namespace std;
 
-int main() {
+int main(void) {
   cmModClass obj("Hello");
   cout << obj.getStr() << endl;
   return 0;

test cases/cmake/2 advanced/main.cpp

@@ -8,7 +8,7 @@
 
 using namespace std;
 
-int main() {
+int main(void) {
   cmModClass obj("Hello");
   cout << obj.getStr() << endl;
   return 0;

test cases/cmake/2 advanced/subprojects/cmMod/main.cpp

@@ -4,7 +4,7 @@
 
 using namespace std;
 
-int main() {
+int main(void) {
   cmModClass obj("Hello (LIB TEST)");
   cout << obj.getStr() << " ZLIB: " << zlibVersion() << endl;
   return 0;

test cases/cmake/3 advanced no dep/main.cpp

@@ -8,7 +8,7 @@
 
 using namespace std;
 
-int main() {
+int main(void) {
   cmModClass obj("Hello");
   cout << obj.getStr() << endl;
   return 0;

test cases/cmake/3 advanced no dep/subprojects/cmMod/main.cpp

@@ -3,7 +3,7 @@
 
 using namespace std;
 
-int main() {
+int main(void) {
   cmModClass obj("Hello (LIB TEST)");
   cout << obj.getStr() << endl;
   return 0;

test cases/cmake/4 code gen/main.cpp

@@ -3,6 +3,6 @@
 
 using namespace std;
 
-int main() {
+int main(void) {
   cout << getStr() << endl;
 }

test cases/cmake/5 object library/main.cpp

@@ -4,6 +4,6 @@
 
 using namespace std;
 
-int main() {
+int main(void) {
   cout << getLibStr() << " -- " << getZlibVers() << endl;
 }

test cases/cmake/6 object library no dep/main.cpp

@@ -4,6 +4,6 @@
 
 using namespace std;
 
-int main() {
+int main(void) {
   cout << getLibStr() << " -- " << getZlibVers() << endl;
 }

test cases/cmake/8 custom command/main.cpp

@@ -3,7 +3,7 @@
 
 using namespace std;
 
-int main() {
+int main(void) {
   cmModClass obj("Hello");
   cout << obj.getStr() << endl;
   cout << obj.getOther() << endl;

test cases/common/102 subproject subdir/subprojects/sub/lib/sub.c

@@ -1,5 +1,5 @@
 #include "sub.h"
 
-int sub() {
+int sub(void) {
     return 0;
 }

test cases/common/102 subproject subdir/subprojects/sub/lib/sub.h

@@ -1,6 +1,6 @@
 #ifndef SUB_H
 #define SUB_H
 
-int sub();
+int sub(void);
 
 #endif

test cases/common/106 extract same name/lib.c

@@ -1,3 +1,3 @@
-int func1() {
+int func1(void) {
     return 23;
 }

test cases/common/106 extract same name/main.c

@@ -1,5 +1,5 @@
-int func1();
-int func2();
+int func1(void);
+int func2(void);
 
 int main(void) {
     return !(func1() == 23 && func2() == 42);

test cases/common/106 extract same name/src/lib.c

@@ -1,3 +1,3 @@
-int func2() {
+int func2(void) {
     return 42;
 }

test cases/common/114 allgenerate/foobar.cpp.in

@@ -1,6 +1,6 @@
 #include<stdio.h>
 
-int main() {
+int main(void) {
   printf("I am a program.\n");
   return 0;
 }

test cases/common/116 subdir subproject/subprojects/sub/sub.c

@@ -1,5 +1,5 @@
 #include "sub.h"
 
-int sub() {
+int sub(void) {
     return 0;
 }

test cases/common/116 subdir subproject/subprojects/sub/sub.h

@@ -1,6 +1,6 @@
 #ifndef SUB_H
 #define SUB_H
 
-int sub();
+int sub(void);
 
 #endif

test cases/common/119 subproject project arguments/exe.cpp

@@ -22,7 +22,7 @@
 #error
 #endif
 
-int main() {
+int main(void) {
     return 0;
 }
 

test cases/common/121 shared module/module.c

@@ -71,7 +71,7 @@ fptr find_any_f (const char *name) {
 }
 #endif
 
-int DLL_PUBLIC func() {
+int DLL_PUBLIC func(void) {
     fptr f;
 
     f = find_any_f ("func_from_language_runtime");
@@ -88,7 +88,7 @@ int DLL_PUBLIC func() {
  * dlopens it. We need to make sure that this works, i.e. that we do
  * not pass -Wl,--no-undefined when linking modules.
  */
-int func_from_language_runtime();
+int func_from_language_runtime(void);
 
 int DLL_PUBLIC func(void) {
     return func_from_language_runtime();

test cases/common/122 llvm ir and assembly/main.cpp

@@ -4,7 +4,7 @@ extern "C" {
   unsigned square_unsigned (unsigned a);
 }
 
-int main ()
+int main (void)
 {
   unsigned int ret = square_unsigned (2);
   if (ret != 4) {

test cases/common/123 cpp and asm/trivial.cc

@@ -4,7 +4,7 @@ extern "C" {
   int get_retval(void);
 }
 
-int main() {
+int main(void) {
   std::cout << "C++ seems to be working." << std::endl;
 #if defined(USE_ASM)
   return get_retval();

test cases/common/124 extract all shared library/extractor.h

@@ -1,6 +1,6 @@
 #pragma once
 
-int func1();
-int func2();
-int func3();
-int func4();
+int func1(void);
+int func2(void);
+int func3(void);
+int func4(void);

test cases/common/124 extract all shared library/four.c

@@ -1,5 +1,5 @@
 #include"extractor.h"
 
-int func4() {
+int func4(void) {
     return 4;
 }

test cases/common/124 extract all shared library/one.c

@@ -1,5 +1,5 @@
 #include"extractor.h"
 
-int func1() {
+int func1(void) {
     return 1;
 }

test cases/common/124 extract all shared library/three.c

@@ -1,5 +1,5 @@
 #include"extractor.h"
 
-int func3() {
+int func3(void) {
     return 3;
 }

test cases/common/124 extract all shared library/two.c

@@ -1,5 +1,5 @@
 #include"extractor.h"
 
-int func2() {
+int func2(void) {
     return 2;
 }

test cases/common/125 object only target/prog.c

@@ -1,6 +1,6 @@
-int func1_in_obj();
-int func2_in_obj();
-int func3_in_obj();
+int func1_in_obj(void);
+int func2_in_obj(void);
+int func3_in_obj(void);
 
 int main(void) {
     return func1_in_obj() + func2_in_obj() + func3_in_obj();

test cases/common/125 object only target/source.c

@@ -1,3 +1,3 @@
-int func1_in_obj() {
+int func1_in_obj(void) {
     return 0;
 }

test cases/common/125 object only target/source2.c

@@ -1,3 +1,3 @@
-int func2_in_obj() {
+int func2_in_obj(void) {
     return 0;
 }

test cases/common/125 object only target/source3.c

@@ -1,3 +1,3 @@
-int func3_in_obj() {
+int func3_in_obj(void) {
     return 0;
 }

test cases/common/126 no buildincdir/include/header.h

@@ -1,3 +1,3 @@
 #pragma once
 
-int foobar();
+int foobar(void);

test cases/common/13 pch/c/prog.c

@@ -1,6 +1,6 @@
 // No includes here, they need to come from the PCH
 
-void func() {
+void func(void) {
     fprintf(stdout, "This is a function that fails if stdio is not #included.\n");
 }
 

test cases/common/13 pch/cpp/prog.cc

@@ -1,11 +1,11 @@
 // Note: if using PGI compilers, you will need to add #include "prog.hh"
 // even though you're using precompiled headers.
-void func() {
+void func(void) {
     std::cout << "This is a function that fails to compile if iostream is not included."
               << std::endl;
 }
 
-int main() {
+int main(void) {
     func();
     return 0;
 }

test cases/common/13 pch/mixed/func.c

@@ -1,7 +1,7 @@
-void tmp_func() {
+void tmp_func(void) {
     fprintf(stdout, "This is a function that fails if stdio is not #included.\n");
 }
 
-int cfunc() {
+int cfunc(void) {
     return 0;
 }

test cases/common/13 pch/mixed/main.cc

@@ -1,10 +1,10 @@
 extern "C" int cfunc();
 
-void func() {
+void func(void) {
     std::cout << "This is a function that fails to compile if iostream is not included."
               << std::endl;
 }
 
-int main() {
+int main(void) {
     return cfunc();
 }

test cases/common/13 pch/userDefined/pch/pch.c

@@ -1,5 +1,5 @@
 #include "pch.h"
 
-int foo() {
+int foo(void) {
     return 0;
 }

test cases/common/13 pch/withIncludeDirectories/prog.c

@@ -1,6 +1,6 @@
 // No includes here, they need to come from the PCH
 
-void func() {
+void func(void) {
     fprintf(stdout, "This is a function that fails if stdio is not #included.\n");
 }
 

test cases/common/135 override options/four.c

@@ -1,6 +1,6 @@
-int func();
+int func(void);
 
-static int duplicate_func() {
+static int duplicate_func(void) {
     return -4;
 }
 

test cases/common/135 override options/one.c

@@ -1,3 +1,3 @@
-static int hidden_func() {
+static int hidden_func(void) {
     return 0;
 }

test cases/common/135 override options/three.c

@@ -1,7 +1,7 @@
-static int duplicate_func() {
+static int duplicate_func(void) {
     return 4;
 }
 
-int func() {
+int func(void) {
     return duplicate_func();
 }

test cases/common/137 c cpp and asm/main.cpp

@@ -5,7 +5,7 @@ extern "C" {
   int get_cval(void);
 }
 
-int main() {
+int main(void) {
   std::cout << "C++ seems to be working." << std::endl;
   return get_retval();
 }

test cases/common/138 compute int/prog.c.in

@@ -4,7 +4,7 @@
 #include <limits.h>
 #include "foobar.h"
 
-int main() {
+int main(void) {
     if(INTSIZE != sizeof(int)) {
         fprintf(stderr, "Mismatch: computed int size %d, actual size %d.\n", INTSIZE, (int)sizeof(int));
         return 1;

test cases/common/139 custom target object output/objdir/source.c

@@ -1,3 +1,3 @@
-int func1_in_obj() {
+int func1_in_obj(void) {
     return 0;
 }

test cases/common/139 custom target object output/progdir/prog.c

@@ -1,4 +1,4 @@
-int func1_in_obj();
+int func1_in_obj(void);
 
 int main(void) {
     return func1_in_obj();

test cases/common/141 whole archive/func1.c

@@ -2,6 +2,6 @@
 
 #include<mylib.h>
 
-int func1() {
+int func1(void) {
     return 42;
 }

test cases/common/141 whole archive/func2.c

@@ -2,6 +2,6 @@
 
 #include<mylib.h>
 
-int func2() {
+int func2(void) {
     return 42;
 }

test cases/common/141 whole archive/mylib.h

@@ -17,5 +17,5 @@
   #endif
 #endif
 
-int DLL_PUBLIC func1();
-int DLL_PUBLIC func2();
+int DLL_PUBLIC func1(void);
+int DLL_PUBLIC func2(void);

test cases/common/149 recursive linking/3rdorderdeps/main.c.in

@@ -4,7 +4,7 @@
 
 SYMBOL_IMPORT int get_@LIBTYPE@@DEPENDENCY@dep_value (void);
 
-int main() {
+int main(void) {
   int val;
 
   val = get_@LIBTYPE@@DEPENDENCY@dep_value ();

test cases/common/151 simd/simd_avx.c

@@ -10,7 +10,7 @@
 
 #ifdef _MSC_VER
 #include<intrin.h>
-int avx_available() {
+int avx_available(void) {
   return 1;
 }
 #else
@@ -23,10 +23,10 @@ int avx_available() {
  * some machines in the CI farm seem to be too
  * old to have AVX so just always return 0 here.
  */
-int avx_available() { return 0; }
+int avx_available(void) { return 0; }
 #else
 
-int avx_available() {
+int avx_available(void) {
     return __builtin_cpu_supports("avx");
 }
 #endif

test cases/common/151 simd/simd_avx2.c

@@ -8,7 +8,7 @@
 
 #ifdef _MSC_VER
 #include<intrin.h>
-int avx2_available() {
+int avx2_available(void) {
     return 0;
 }
 #else
@@ -16,9 +16,9 @@ int avx2_available() {
 #include<cpuid.h>
 
 #if defined(__APPLE__)
-int avx2_available() { return 0; }
+int avx2_available(void) { return 0; }
 #else
-int avx2_available() {
+int avx2_available(void) {
     return __builtin_cpu_supports("avx2");
 }
 #endif

test cases/common/151 simd/simd_mmx.c

@@ -5,7 +5,7 @@
 
 #ifdef _MSC_VER
 #include<intrin.h>
-int mmx_available() {
+int mmx_available(void) {
   return 1;
 }
 /* Contrary to MSDN documentation, MMX intrinsics
@@ -18,7 +18,7 @@ void increment_mmx(float arr[4]) {
   arr[3]++;
 }
 #elif defined(__MINGW32__)
-int mmx_available() {
+int mmx_available(void) {
   return 1;
 }
 /* MinGW does not seem to ship with MMX or it is broken.
@@ -34,9 +34,9 @@ void increment_mmx(float arr[4]) {
 #include<cpuid.h>
 
 #if defined(__APPLE__)
-int mmx_available() { return 1; }
+int mmx_available(void) { return 1; }
 #else
-int mmx_available() {
+int mmx_available(void) {
     return __builtin_cpu_supports("mmx");
 }
 #endif

test cases/common/151 simd/simd_neon.c

@@ -4,7 +4,7 @@
 #include<arm_neon.h>
 #include<stdint.h>
 
-int neon_available() {
+int neon_available(void) {
     return 1; /* Incorrect, but I don't know how to check this properly. */
 }
 

test cases/common/151 simd/simd_sse.c

@@ -3,7 +3,7 @@
 
 #ifdef _MSC_VER
 #include<intrin.h>
-int sse_available() {
+int sse_available(void) {
   return 1;
 }
 #else
@@ -13,9 +13,9 @@ int sse_available() {
 #include<stdint.h>
 
 #if defined(__APPLE__)
-int sse_available() { return 1; }
+int sse_available(void) { return 1; }
 #else
-int sse_available() {
+int sse_available(void) {
     return __builtin_cpu_supports("sse");
 }
 #endif

test cases/common/151 simd/simd_sse2.c

@@ -3,7 +3,7 @@
 #include<emmintrin.h>
 
 #ifdef _MSC_VER
-int sse2_available() {
+int sse2_available(void) {
   return 1;
 }
 
@@ -12,9 +12,9 @@ int sse2_available() {
 #include<stdint.h>
 
 #if defined(__APPLE__)
-int sse2_available() { return 1; }
+int sse2_available(void) { return 1; }
 #else
-int sse2_available() {
+int sse2_available(void) {
     return __builtin_cpu_supports("sse2");
 }
 #endif

test cases/common/151 simd/simd_sse3.c

@@ -3,7 +3,7 @@
 
 #ifdef _MSC_VER
 #include<intrin.h>
-int sse3_available() {
+int sse3_available(void) {
     return 1;
 }
 #else
@@ -13,9 +13,9 @@ int sse3_available() {
 #include<stdint.h>
 
 #if defined(__APPLE__)
-int sse3_available() { return 1; }
+int sse3_available(void) { return 1; }
 #else
-int sse3_available() {
+int sse3_available(void) {
     return __builtin_cpu_supports("sse3");
 }
 #endif

test cases/common/151 simd/simd_sse41.c

@@ -6,7 +6,7 @@
 #ifdef _MSC_VER
 #include<intrin.h>
 
-int sse41_available() {
+int sse41_available(void) {
   return 1;
 }
 
@@ -15,9 +15,9 @@ int sse41_available() {
 #include<cpuid.h>
 
 #if defined(__APPLE__)
-int sse41_available() { return 1; }
+int sse41_available(void) { return 1; }
 #else
-int sse41_available() {
+int sse41_available(void) {
     return __builtin_cpu_supports("sse4.1");
 }
 #endif

test cases/common/151 simd/simd_sse42.c

@@ -5,7 +5,7 @@
 #ifdef _MSC_VER
 #include<intrin.h>
 
-int sse42_available() {
+int sse42_available(void) {
   return 1;
 }
 
@@ -15,11 +15,11 @@ int sse42_available() {
 #include<cpuid.h>
 
 #ifdef __APPLE__
-int sse42_available() {
+int sse42_available(void) {
     return 1;
 }
 #else
-int sse42_available() {
+int sse42_available(void) {
     return __builtin_cpu_supports("sse4.2");
 }
 #endif

test cases/common/151 simd/simd_ssse3.c

@@ -7,7 +7,7 @@
 #ifdef _MSC_VER
 #include<intrin.h>
 
-int ssse3_available() {
+int ssse3_available(void) {
   return 1;
 }
 
@@ -16,7 +16,7 @@ int ssse3_available() {
 #include<cpuid.h>
 #include<stdint.h>
 
-int ssse3_available() {
+int ssse3_available(void) {
 #ifdef __APPLE__
     return 1;
 #elif defined(__clang__)

test cases/common/151 simd/simdfuncs.h

@@ -18,57 +18,57 @@
 void increment_fallback(float arr[4]);
 
 #if HAVE_MMX
-int mmx_available();
+int mmx_available(void);
 void increment_mmx(float arr[4]);
 #endif
 
 #if HAVE_SSE
-int sse_available();
+int sse_available(void);
 void increment_sse(float arr[4]);
 #endif
 
 #if HAVE_SSE2
-int sse2_available();
+int sse2_available(void);
 void increment_sse2(float arr[4]);
 #endif
 
 #if HAVE_SSE3
-int sse3_available();
+int sse3_available(void);
 void increment_sse3(float arr[4]);
 #endif
 
 #if HAVE_SSSE3
-int ssse3_available();
+int ssse3_available(void);
 void increment_ssse3(float arr[4]);
 #endif
 
 #if HAVE_SSE41
-int sse41_available();
+int sse41_available(void);
 void increment_sse41(float arr[4]);
 #endif
 
 #if HAVE_SSE42
-int sse42_available();
+int sse42_available(void);
 void increment_sse42(float arr[4]);
 #endif
 
 #if HAVE_AVX
-int avx_available();
+int avx_available(void);
 void increment_avx(float arr[4]);
 #endif
 
 #if HAVE_AVX2
-int avx2_available();
+int avx2_available(void);
 void increment_avx2(float arr[4]);
 #endif
 
 #if HAVE_NEON
-int neon_available();
+int neon_available(void);
 void increment_neon(float arr[4]);
 #endif
 
 #if HAVE_ALTIVEC
-int altivec_available();
+int altivec_available(void);
 void increment_altivec(float arr[4]);
 #endif
 

test cases/common/157 wrap file should not failed/subprojects/foo-1.0/foo.c

@@ -1,3 +1,3 @@
-int dummy_func() {
+int dummy_func(void) {
     return 42;
 }

test cases/common/157 wrap file should not failed/subprojects/zlib-1.2.8/foo.c

@@ -1,3 +1,3 @@
-int dummy_func() {
+int dummy_func(void) {
     return 42;
 }

test cases/common/159 subproject dir name collision/a.c

@@ -1,6 +1,6 @@
 #include<assert.h>
-char func_b();
-char func_c();
+char func_b(void);
+char func_c(void);
 
 int main(void) {
     if(func_b() != 'b') {

test cases/common/159 subproject dir name collision/custom_subproject_dir/B/b.c

@@ -1,5 +1,5 @@
 #include<stdlib.h>
-char func_c();
+char func_c(void);
 
 #if defined _WIN32 || defined __CYGWIN__
 #define DLL_PUBLIC __declspec(dllexport)
@@ -12,7 +12,7 @@ char func_c();
   #endif
 #endif
 
-char DLL_PUBLIC func_b() {
+char DLL_PUBLIC func_b(void) {
     if(func_c() != 'c') {
         exit(3);
     }

test cases/common/159 subproject dir name collision/custom_subproject_dir/C/c.c

@@ -9,6 +9,6 @@
   #endif
 #endif
 
-char DLL_PUBLIC func_c() {
+char DLL_PUBLIC func_c(void) {
     return 'c';
 }

test cases/common/159 subproject dir name collision/other_subdir/custom_subproject_dir/other.c

@@ -11,7 +11,7 @@
   #endif
 #endif
 
-char DLL_PUBLIC func_b() {
+char DLL_PUBLIC func_b(void) {
     if('c' != 'c') {
         exit(3);
     }

test cases/common/161 custom target subdir depend files/subdir/foo.c.in

@@ -1,6 +1,6 @@
 #include <stdio.h>
 
-int main() {
+int main(void) {
     printf("foo is working.\n");
     return 0;
 }

test cases/common/165 custom target template substitution/foo.c.in

@@ -1,6 +1,6 @@
 #include <stdio.h>
 
-int main() {
+int main(void) {
     printf("foo is working.\n");
     return 0;
 }

test cases/common/166 not-found dependency/subprojects/trivial/trivial.c

@@ -1,3 +1,3 @@
-int subfunc() {
+int subfunc(void) {
     return 42;
 }

test cases/common/172 subproject nested subproject dirs/contrib/subprojects/alpha/a.c

@@ -1,4 +1,4 @@
-int func2();
+int func2(void);
 
 #if defined _WIN32 || defined __CYGWIN__
   #define DLL_PUBLIC __declspec(dllexport)
@@ -11,5 +11,5 @@ int func2();
   #endif
 #endif
 
-int DLL_PUBLIC func() { return func2(); }
+int DLL_PUBLIC func(void) { return func2(); }
 

test cases/common/172 subproject nested subproject dirs/contrib/subprojects/beta/b.c

@@ -9,6 +9,6 @@
   #endif
 #endif
 
-int DLL_PUBLIC func2() {
+int DLL_PUBLIC func2(void) {
     return 42;
 }

test cases/common/172 subproject nested subproject dirs/prog.c

@@ -1,4 +1,4 @@
-int func();
+int func(void);
 
 int main(void) {
     return func() == 42 ? 0 : 1;

test cases/common/173 preserve gendir/genprog.py

@@ -4,12 +4,12 @@ import os, sys, argparse
 
 h_templ = '''#pragma once
 
-int %s();
+int %s(void);
 '''
 
 c_templ = '''#include"%s.h"
 
-int %s() {
+int %s(void) {
     return 0;
 }
 '''

test cases/common/174 source in dep/bar.cpp

@@ -1,5 +1,5 @@
-extern "C" int foo();
+extern "C" int foo(void);
 
-int main(int, char**) {
+int main(void) {
     return foo() != 42;
 }

test cases/common/174 source in dep/foo.c

@@ -1,3 +1,3 @@
-int foo() {
+int foo(void) {
     return 42;
 }

test cases/common/174 source in dep/generated/genheader.py

@@ -7,7 +7,7 @@ ofile = sys.argv[2]
 
 templ = '''#pragma once
 
-int %s() {
+int %s(void) {
   return 42;
 }
 '''

test cases/common/175 generator link whole/generator.py

@@ -15,12 +15,12 @@ def main():
         hfile.write('''
 #pragma once
 #include "export.h"
-int DLL_PUBLIC {name}();
+int DLL_PUBLIC {name}(void);
 '''.format(name=name))
     with open(cname, 'w') as cfile:
         cfile.write('''
 #include "{name}.h"
-int {name}() {{
+int {name}(void) {{
     return {size};
 }}
 '''.format(name=name, size=len(name)))

test cases/common/175 generator link whole/pull_meson_test_function.c

@@ -1,6 +1,6 @@
 #include "export.h"
 #include "meson_test_function.h"
 
-int DLL_PUBLIC function_puller() {
+int DLL_PUBLIC function_puller(void) {
     return meson_test_function();
 }

test cases/common/178 as-needed/main.cpp

@@ -2,6 +2,6 @@
 
 #include "libA.h"
 
-int main() {
+int main(void) {
   return !meson_test_as_needed::linked ? EXIT_SUCCESS : EXIT_FAILURE;
 }

test cases/common/18 array/func.c

@@ -1 +1 @@
-int func() { return 0; }
+int func(void) { return 0; }

test cases/common/18 array/prog.c

@@ -1,3 +1,3 @@
-extern int func();
+extern int func(void);
 
 int main(void) { return func(); }

test cases/common/183 bothlibraries/libfile.c

@@ -2,6 +2,6 @@
 
 DO_EXPORT int retval = 42;
 
-DO_EXPORT int func() {
+DO_EXPORT int func(void) {
     return retval;
 }

test cases/common/183 bothlibraries/main.c

@@ -1,6 +1,6 @@
 #include "mylib.h"
 
-DO_IMPORT int func();
+DO_IMPORT int func(void);
 DO_IMPORT int retval;
 
 int main(void) {

test cases/common/184 escape and unicode/file.c.in

@@ -1,5 +1,5 @@
 #include<stdio.h>
-const char* does_it_work() {
+const char* does_it_work(void) {
     printf("{NAME}\n");
     return "yes it does";
 }

test cases/common/184 escape and unicode/fun.c

@@ -1,3 +1,3 @@
-int a_fun() {
+int a_fun(void) {
     return 1;
 }

test cases/common/184 escape and unicode/main.c

@@ -1,8 +1,8 @@
 #include <string.h>
 
-const char* does_it_work();
+const char* does_it_work(void);
 
-int a_fun();
+int a_fun(void);
 
 int main(void) {
     if(strcmp(does_it_work(), "yes it does") != 0) {

test cases/common/187 find override/otherdir/main.c

@@ -1,4 +1,4 @@
-int be_seeing_you();
+int be_seeing_you(void);
 
 int main(void) {
     return be_seeing_you() == 6 ? 0 : 1;

test cases/common/187 find override/otherdir/main2.c

@@ -1,4 +1,4 @@
-int number_returner();
+int number_returner(void);
 
 int main(void) {
     return number_returner() == 100 ? 0 : 1;

test cases/common/187 find override/subdir/converter.py

@@ -5,7 +5,7 @@ import pathlib
 
 [ifilename, ofilename] = sys.argv[1:3]
 
-ftempl = '''int %s() {
+ftempl = '''int %s(void) {
     return 6;
 }
 '''