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Improve -Wno-c++11-narrowing/-Wno-narrowing detection

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This commit is contained in:
Stefan Siegl 2015-10-18 18:03:04 +02:00
parent b29bb886bb
commit 7805abfb18
1 changed files with 23 additions and 3 deletions
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26
config.m4
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@ -46,12 +46,32 @@ if test "$PHP_V8JS" != "no"; then
CPPFLAGS=$old_CPPFLAGS
]);
AC_CACHE_CHECK(how to disable c++11 narrowing warning, ac_cv_v8_narrowing, [
AC_CACHE_CHECK(how to allow c++11 narrowing, ac_cv_v8_narrowing, [
ac_cv_v8_narrowing=""
old_CXXFLAGS=$CXXFLAGS
AC_LANG_PUSH([C++])
CXXFLAGS="-Wno-c++11-narrowing"
AC_TRY_RUN([int main() { unsigned int a[1] = { -1 }; (void) a; return 0; }],[ac_cv_v8_narrowing="-Wno-c++11-narrowing"],[],[])
CXXFLAGS="-std="$ac_cv_v8_cstd
AC_TRY_RUN([int main() {
struct { unsigned int x; } foo = {-1};
(void) foo;
return 0;
}], [ ac_cv_v8_narrowing="" ], [
CXXFLAGS="-Wno-c++11-narrowing -std="$ac_cv_v8_cstd
AC_TRY_RUN([int main() {
struct { unsigned int x; } foo = {-1};
(void) foo;
return 0;
}], [ ac_cv_v8_narrowing="-Wno-c++11-narrowing" ], [
CXXFLAGS="-Wno-narrowing -std="$ac_cv_v8_cstd
AC_TRY_RUN([int main() {
struct { unsigned int x; } foo = {-1};
(void) foo;
return 0;
}], [ ac_cv_v8_narrowing="-Wno-narrowing" ], [
AC_MSG_ERROR([cannot compile with narrowing])
], [])
], [])
], [])
AC_LANG_POP([C++])
CXXFLAGS=$old_CXXFLAGS
]);