diff options
| -rw-r--r-- | meson-cc-tests/check-unused-result.c | 9 | ||||
| -rw-r--r-- | meson.build | 55 |
2 files changed, 62 insertions, 2 deletions
diff --git a/meson-cc-tests/check-unused-result.c b/meson-cc-tests/check-unused-result.c new file mode 100644 index 000000000..ce7279ec8 --- /dev/null +++ b/meson-cc-tests/check-unused-result.c @@ -0,0 +1,9 @@ +__attribute__((__warn_unused_result__)) void f (void) {} +__attribute__((__warn_unused_result__)) int g; + +int main(int c, char **v) +{ + (void)c; + (void)v; + return 0; +} diff --git a/meson.build b/meson.build index ca9d72825..ce7449ffb 100644 --- a/meson.build +++ b/meson.build @@ -33,8 +33,61 @@ else cairo_libversion = '@0@.@1@.@2@'.format(cairo_version_sonum, cairo_version, cairo_version_micro) endif +conf = configuration_data() + cc = meson.get_compiler('c') +# Compiler flags +cflags = [] +if cc.get_id() != 'msvc' + cflags += [ + '-Wall', + '-Wextra', + '-Wmissing-declarations', + '-Werror-implicit-function-declaration', + '-Wpointer-arith', + '-Wwrite-strings', + '-Wsign-compare', + '-Wpacked', + '-Wswitch-enum', + '-Wmissing-format-attribute', + '-Wvolatile-register-var', + '-Wstrict-aliasing=2', + '-Winit-self', + '-Wunsafe-loop-optimizations', + '-Wno-missing-field-initializers', + '-Wno-unused-parameter', + '-Wno-attributes', + '-Wno-long-long', + '-Winline' + ] + + cflags += ['-Wno-unused-but-set-variable', + '-Wno-enum-conversion' + ] + + cflags += [ + '-fno-strict-aliasing', + '-fno-common' + ] + + cflags += '-Wp,-D_FORTIFY_SOURCE=2' + + supported_cflags = cc.get_supported_arguments(cflags) + add_project_arguments(supported_cflags, language: 'c') + + # We only wish to enable attribute(warn_unused_result) if we can prevent + # gcc from generating thousands of warnings about the misapplication of the + # attribute to void functions and variables. + warn_unused_result = '' + if supported_cflags.contains('-Wno-attributes') + if cc.compiles(files('meson-cc-tests/check-unused-result.c'), args : ['-Wno-attributes', '-Werror']) + warn_unused_result = '__attribute__((__warn_unused_result__))' + endif + endif + conf.set('WARN_UNUSED_RESULT', warn_unused_result) +endif + if cc.get_id() == 'msvc' # Basic usage in the cairo type system that causes spammy and useless warnings add_project_arguments('/wd4244', '/wd4146', @@ -137,8 +190,6 @@ test_deps = [] internal_deps = [] extra_link_args = [] -conf = configuration_data() - if host_machine.endian() == 'big' conf.set('WORDS_BIGENDIAN', 1) endif |