diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2021-11-08 12:31:52 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-10-01 21:16:36 +0200 |
| commit | b485458e00dae4af5e2b7b1c17521e2885180544 (patch) | |
| tree | a53770c1c583dc48a3844e83e1a3e2f0d97e2907 /meson.build | |
| parent | 6d3226357fb848499aacf609bf628932bca781ea (diff) | |
configure, meson: move C++ compiler detection to meson.build
The test is slightly weaker than before, because it does not
call an extern "C" function from a C source file. However,
in practice what we seek to detect is ABI compatibility of the
various sanitizer flags, and for that it is enough to compile
anything with CC and link it with CXX.
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'meson.build')
| -rw-r--r-- | meson.build | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/meson.build b/meson.build index 780654b00c..9c57ebdfb9 100644 --- a/meson.build +++ b/meson.build @@ -180,7 +180,6 @@ endif ################## qemu_cflags = config_host['QEMU_CFLAGS'].split() -qemu_cxxflags = config_host['QEMU_CXXFLAGS'].split() qemu_objcflags = config_host['QEMU_OBJCFLAGS'].split() qemu_ldflags = config_host['QEMU_LDFLAGS'].split() @@ -194,7 +193,6 @@ endif if get_option('gprof') qemu_cflags += ['-p'] - qemu_cxxflags += ['-p'] qemu_objcflags += ['-p'] qemu_ldflags += ['-p'] endif @@ -240,8 +238,33 @@ if get_option('fuzzing') endif add_global_arguments(qemu_cflags, native: false, language: ['c']) -add_global_arguments(qemu_cxxflags, native: false, language: ['cpp']) add_global_arguments(qemu_objcflags, native: false, language: ['objc']) + +# Check that the C++ compiler exists and works with the C compiler. +link_language = 'c' +linker = cc +qemu_cxxflags = [] +if add_languages('cpp', required: false, native: false) + cxx = meson.get_compiler('cpp') + add_global_arguments(['-D__STDC_LIMIT_MACROS', '-D__STDC_CONSTANT_MACROS', '-D__STDC_FORMAT_MACROS'], + native: false, language: 'cpp') + foreach k: qemu_cflags + if k not in ['-Wstrict-prototypes', '-Wmissing-prototypes', '-Wnested-externs', + '-Wold-style-declaration', '-Wold-style-definition', '-Wredundant-decls'] + qemu_cxxflags += [k] + endif + endforeach + add_global_arguments(qemu_cxxflags, native: false, language: 'cpp') + + if cxx.links(files('scripts/main.c'), args: qemu_cflags) + link_language = 'cpp' + linker = cxx + else + message('C++ compiler does not work with C compiler') + message('Disabling C++-specific optional code') + endif +endif + add_global_link_arguments(qemu_ldflags, native: false, language: ['c', 'cpp', 'objc']) if targetos == 'linux' @@ -255,14 +278,6 @@ add_project_arguments('-iquote', '.', '-iquote', meson.current_source_dir() / 'include', language: ['c', 'cpp', 'objc']) -link_language = meson.get_external_property('link_language', 'cpp') -if link_language == 'cpp' - add_languages('cpp', required: true, native: false) - cxx = meson.get_compiler('cpp') - linker = cxx -else - linker = cc -endif if host_machine.system() == 'darwin' add_languages('objc', required: false, native: false) endif |