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rb_cv_have_alignas: not used any longer

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Availability of `alignas` is checked in include/ruby/internal/stdalign.h
now.  That does not need this configure check.  Also as commented in the
header, we see `_Alignas` being inadequate for our purpose.
This commit is contained in:
卜部昌平 2020-09-23 09:41:08 +09:00
parent 996af2ce08
commit fe875be01a
Notes: git 2020-09-25 11:39:06 +09:00
1 changed files with 0 additions and 28 deletions
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28
configure.ac
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@ -1460,34 +1460,6 @@ AS_IF([test "$rb_cv_va_args_macro" = yes], [
AC_DEFINE(HAVE_VA_ARGS_MACRO)
])
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)@:>@@:>@" \
"__declspec(aligned(x))" \
"__attribute__((__aligned__(x)))" \
;
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([
@%:@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
])])
AS_IF([test "$rb_cv_have_alignas" != no], [
AC_DEFINE_UNQUOTED([RUBY_ALIGNAS(x)], $rb_cv_have_alignas)
])
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