diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 81efb0bbc1..f7707b761d 100644 --- a/configure.ac +++ b/configure.ac @@ -1743,6 +1743,30 @@ EOH ])dnl ])dnl +AC_CACHE_CHECK([for alignas() syntax], rb_cv_have_alignas, [ +rb_cv_have_alignas=no +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( + [@%:@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) +]) + dnl RUBY_DECL_ATTRIBUTE(attrib, macroname, cachevar, condition, type, code) AC_DEFUN([RUBY_DECL_ATTRIBUTE], [dnl m4_ifval([$2], dnl @@ -1773,6 +1797,7 @@ ${rbcv_cond+[@%:@define ]attrib[](attrib_params)[ x]} ${rbcv_cond+[@%:@endif]}) $6 @%:@define mesg ("") +@%:@define n (32768) attrib[](attrib_params)[;], [], [rbcv="$mac"; break]) done @@ -1801,7 +1826,6 @@ AC_DEFUN([RUBY_TYPE_ATTRIBUTE], [dnl @%:@define x struct conftest_attribute_check {int i;} ]) ]) - RUBY_FUNC_ATTRIBUTE(__const__, CONSTFUNC) RUBY_FUNC_ATTRIBUTE(__pure__, PUREFUNC) RUBY_FUNC_ATTRIBUTE(__noreturn__, NORETURN) |