diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 31c0d553..5dd27ca2 100644 --- a/configure.ac +++ b/configure.ac @@ -994,6 +994,21 @@ fi # +# Check whether the compiler supports the GCC style may_alias attribute +# +AC_CACHE_CHECK([whether the GCC style may_alias attribute is supported], + [gcry_cv_gcc_attribute_may_alias], + [gcry_cv_gcc_attribute_may_alias=no + AC_COMPILE_IFELSE([AC_LANG_SOURCE( + [[struct { int a; } foo __attribute__ ((may_alias));]])], + [gcry_cv_gcc_attribute_may_alias=yes])]) +if test "$gcry_cv_gcc_attribute_may_alias" = "yes" ; then + AC_DEFINE(HAVE_GCC_ATTRIBUTE_MAY_ALIAS,1, + [Defined if a GCC style "__attribute__ ((may_alias))" is supported]) +fi + + +# # Check whether the compiler supports 'asm' or '__asm__' keyword for # assembler blocks. # |