[SCM] libav/experimental: Check if PIC is somehow already enabled (e.g. a compiler that enables it by default). This in particular ensures that -DPIC is set appropriately for YASM, which avoids linking failures on x86_64 for compilers that have PIE enabled by default (e.g. hardened Gentoo). It also makes the macho64 special-case hack adding -DPIC to YASMFLAGS obsolete.

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit 5755bc88e51a82dd00897d840df2a688631da768
Author: Reimar Döffinger <Reimar.Doeffinger at gmx.de>
Date:   Tue Nov 10 12:57:28 2009 +0000

    Check if PIC is somehow already enabled (e.g. a compiler that enables it by default).
    This in particular ensures that -DPIC is set appropriately for YASM, which avoids
    linking failures on x86_64 for compilers that have PIE enabled by default
    (e.g. hardened Gentoo).
    It also makes the macho64 special-case hack adding -DPIC to YASMFLAGS obsolete.
    
    Originally committed as revision 20497 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/configure b/configure
index 7ad3c26..83791fc 100755
--- a/configure
+++ b/configure
@@ -1876,6 +1876,9 @@ esac
 
 enable $arch $subarch
 enabled spic && enable pic
+# This is the same check as used in libavutil/internal.h
+# to enable RIP-relative addressing for x86_64 inline asm.
+check_cpp_condition stdlib.h "defined(__PIC__) || defined(__pic__) || defined(PIC)" && enable pic
 
 # OS specific
 case $target_os in
@@ -2237,7 +2240,6 @@ EOF
     test -n "$extern_prefix"  && append YASMFLAGS "-DPREFIX"
     case "$objformat" in
         elf) enabled debug && append YASMFLAGS "-g dwarf2" ;;
-        macho64)              append YASMFLAGS "-DPIC" ;;
     esac
     disabled yasm || { check_yasm "pabsw xmm0, xmm0" && enable yasm; }
 

-- 
Libav/FFmpeg packaging