From a7845321db50f67e7379ca972db7539ece4fa452 Mon Sep 17 00:00:00 2001
From: reimar <reimar@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Sat, 19 Sep 2009 13:18:48 +0000
Subject: Add a check for availability of ebx register, needed for
 architectures that require PIE like Haiku or 64 bit OSX.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@29692 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 configure | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

(limited to 'configure')

diff --git a/configure b/configure
index 18f3798732..5e264a3853 100755
--- a/configure
+++ b/configure
@@ -2553,6 +2553,24 @@ EOF
 cc_check && ten_operands=yes && def_ten_operands='#define HAVE_TEN_OPERANDS 1'
 echores $ten_operands
 
+echocheck "ebx availability"
+ebx_available=no
+def_ebx_available='#define HAVE_EBX_AVAILABLE 0'
+cat > $TMPC << EOF
+int main(void) {
+    int x;
+    __asm__ volatile(
+        "xor %0, %0"
+        :"=b"(x)
+        // just adding ebx to clobber list seems unreliable with some
+        // compilers, e.g. Haiku's gcc 2.95
+    );
+    return 0;
+}
+EOF
+cc_check && ebx_available=yes && def_ebx_available='#define HAVE_EBX_AVAILABLE 1'
+echores $ebx_available
+
 echocheck "yasm"
 if test -z "$YASMFLAGS" ; then
   if darwin ; then
@@ -8902,7 +8920,7 @@ $def_yasm
 #define CONFIG_RDFT 1
 
 /* Use these registers in FFmpeg x86 inline asm. No proper detection yet. */
-#define HAVE_EBX_AVAILABLE 1
+$def_ebx_available
 #ifndef MP_DEBUG
 #define HAVE_EBP_AVAILABLE 1
 #else
-- 
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