commit f9b94cb9df9b7c7fdd607dea7f6e55d2a6203837
author Alexandre Julliard <julliard@winehq.org> Wed Dec 06 03:50:22 2000 +0000
committer Alexandre Julliard <julliard@winehq.org> Wed Dec 06 03:50:22 2000 +0000
tree 0d49cd093c8fd3ba23451e172452e2ce01bfcaed
parent 0335095f5d02f5c0ab18ceaf4bb6f7f087acd9c9

Set -mpreferred-stack-boundary=2 flag if supported to avoid wasteful
stack alignments.

configure.in

diff --git a/configure.in b/configure.in
index 9cb2e0e..7ad8c04 100644
--- a/configure.in
+++ b/configure.in
@@ -461,6 +461,19 @@
   then
     CFLAGS="$CFLAGS -fno-strength-reduce"
   fi
+
+  dnl Check for -mpreferred-stack-boundary
+  AC_CACHE_CHECK("for gcc -mpreferred-stack-boundary=2 support",
+                 ac_cv_c_gcc_stack_boundary,
+  [saved_cflags=$CFLAGS
+  CFLAGS="$CFLAGS -mpreferred-stack-boundary=2"
+  AC_TRY_COMPILE(,[return 0],ac_cv_c_gcc_stack_boundary="yes",ac_cv_c_gcc_stack_boundary="no")
+  CFLAGS=$saved_cflags
+  ])
+  if test "$ac_cv_c_gcc_stack_boundary" = "yes"
+  then
+    CFLAGS="$CFLAGS -mpreferred-stack-boundary=2"
+  fi
 fi
 
 dnl **** Check if we need to place .type inside a .def directive ****