[FFmpeg-cvslog] configure: Refactor setting of feature test macro _XOPEN_SOURCE

Jörg Krause git at videolan.org
Mon Sep 22 00:53:11 CEST 2014

ffmpeg | branch: master | Jörg Krause <jkrause at posteo.de> | Sun Sep 21 22:48:01 2014 +0200| [56b8d106769c5c5f9174dcc426f1ee2f991428b1] | committer: Michael Niedermayer

configure: Refactor setting of feature test macro _XOPEN_SOURCE

Some C libraries, eg glibc, uclibc, and musl, uses feature test macros
to expose definitions conforming to the standards ISO C, POSIX and
extensions. According to which feature test macros are defined by the
user or the compiler, a header file, eg <features.h>, used by these
libraries internally defines various other macros.

glibc and uclibc also defines release test macros, eg __GLIBC__ and
__UCLIBC__ in <features.h>. musl does not have (and does not want) a
macro __MUSL__. Therefore it is not possible to check for the musl

However, building FFmpeg with musl needs the feature test macro
_XOPEN_SOURCE=600 to be defined.

Signed-off-by: Jörg Krause <jkrause at posteo.de>
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=56b8d106769c5c5f9174dcc426f1ee2f991428b1

 configure |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure b/configure
index 110a3fd..b9707c5 100755
--- a/configure
+++ b/configure
@@ -4229,6 +4229,9 @@ probe_libc(){
     elif check_${pfx}cpp_condition sys/brand.h "defined LABELED_BRAND_NAME"; then
         eval ${pfx}libc_type=solaris
         add_${pfx}cppflags -D__EXTENSIONS__ -D_XOPEN_SOURCE=600
+    # FFmpeg needs a POSIX.1-2001/XSI compliant C library
+    else
+        add_${pfx}cppflags -D_XOPEN_SOURCE=600

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