diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/configure.in b/configure.in index 6a5f302d10..0a73dd7581 100644 --- a/configure.in +++ b/configure.in @@ -577,13 +577,14 @@ AC_CACHE_CHECK([for external $1], rb_cv_var_$1, [rb_cv_var_$1=no AC_TRY_COMPILE([#define _XOPEN_SOURCE 1 $2 - void *t;], + const volatile void *volatile t;], [t = &(&$1)[0];], [for t in $3; do AC_TRY_COMPILE([#define _XOPEN_SOURCE 1 $2 - extern $t $1;], - [void *t = &(&$1)[0];], + extern $t $1; + const volatile void *volatile t;], + [t = &(&$1)[0];], [rb_cv_var_$1=$t; break]) done])]) if test "[$rb_cv_var_]$1" != no; then |