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Prefer alignas() over _Alignas()

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to allow Intel C++ compiler to read ruby.h.
This is similar to 9930481a23
This commit is contained in:
Yusuke Endoh 2020-02-20 22:36:53 +09:00
parent 3e12b65861
commit df26d36e5b
1 changed files with 8 additions and 3 deletions
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11
configure.ac
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@ -1359,10 +1359,11 @@ AS_IF([test "$rb_cv_va_args_macro" = yes], [
AC_CACHE_CHECK([for alignas() syntax], rb_cv_have_alignas, [
rb_cv_have_alignas=no
# Prefer alignas over _Alignas to allow C++ compiler to read ruby.h
RUBY_WERROR_FLAG([
for attr in \
"_Alignas(x)" \
"alignas(x)" \
"_Alignas(x)" \
"@<:@@<:@alignas(x)@:>@@:>@" \
"__declspec(aligned(x))" \
"__attribute__((__aligned__(x)))" \
@ -1371,8 +1372,11 @@ do
# C11 _Alignas and GCC __attribute__((__aligned__)) behave
# slightly differently. What we want is GCC's. Check that
# here by something C11 does not allow (`struct ALIGNAS ...`)
AC_TRY_COMPILE(
[@%:@define ALIGNAS(x) $attr
AC_TRY_COMPILE([
@%:@ifdef HAVE_STDALIGN_H
@%:@include <stdalign.h>
@%:@endif
@%:@define ALIGNAS(x) $attr
struct ALIGNAS(128) conftest_tag { int foo; } foo; ], [],
[rb_cv_have_alignas="$attr"; break], [])
done
@ -1383,6 +1387,7 @@ AS_IF([test "$rb_cv_have_alignas" != no], [
AC_CACHE_CHECK([for alignof() syntax], rb_cv_have_alignof,[
rb_cv_have_alignof=no
# Prefer alignof over _Alignof to allow C++ compiler to read ruby.h
RUBY_WERROR_FLAG([
for expr in \
"alignof" \