From d22c13a8df238d9215d0adb8d47b1e458513aa93 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?M=C3=A5ns=20Rullg=C3=A5rd?= <mans@mansr.com>
Date: Thu, 6 Aug 2009 15:45:19 +0000
Subject: [PATCH] configure: support --cpu=host to tune for the host system
This requires a gcc version with -march=native or -mcpu=native support,
which is somewhat random for non-x86.
Originally committed as revision 19602 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
configure | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/configure b/configure
index 47731efee19..f26c0adede2 100755
--- a/configure
+++ b/configure
@@ -1582,6 +1582,22 @@ if test -n "$sysroot"; then
esac
fi
+if test "$cpu" = host; then
+ enabled cross_compile && die "--cpu=host makes no sense when cross-compiling."
+
+ case "$cc_type" in
+ gcc)
+ check_native(){
+ $cc $1=native -v -c -o $TMPO $TMPC >$TMPE 2>&1 || return
+ awk "/$1=/{ match(\$0, /$1=(\\w+)/, a);print a[1];exit }" $TMPE
+ }
+ cpu=$(check_native -march || check_native -mcpu)
+ ;;
+ esac
+
+ test "${cpu:-host}" = host && die "--cpu=host not supported with compiler $cc"
+fi
+
# Add processor-specific flags
case $cpu in
601|ppc601|PowerPC601)
--
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