try to reuse ffmpeg config for linux on other *nix

ffmpeg.gyp

 # Copyright (c) 2010 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # There's a couple key GYP variables that control how FFmpeg is built:
 #   ffmpeg_branding
 #     Controls whether we build the Chromium or Google Chrome version of
 #     FFmpeg.  The Google Chrome version contains additional codecs.
 #     Typical values are Chromium, Chrome, ChromiumOS, and ChromeOS.
 #   use_system_ffmpeg
@@ skipping 43 matching lines @@
         'ffmpeg_config%': 'arm-neon',
       }, {
         'ffmpeg_config%': '<(target_arch)',
       }],
       ['target_arch=="x64" or target_arch=="ia32"', {
         'ffmpeg_asm_lib': 1,
       }],
       ['target_arch=="arm"', {
         'ffmpeg_asm_lib': 0,
       }],
+      ['OS=="mac" or OS=="win"', {
+        'os_config%': '<(OS)',
+      }, {  # all other Unix OS's use the linux config 
+        'os_config%': 'linux',
+      }],
 
       # libvpx location.
       # TODO(scherkus): libvpx_hack_dir is a hack to make -L work on linux.
       ['OS=="mac" or OS=="win"', {
         'libvpx_incl_dir': '../libvpx/include',
         'libvpx_hack_dir': '../libvpx',
       }],
       ['OS!="mac" and OS!="win" and inside_chromium_build==1', {
         'libvpx_incl_dir': '../libvpx/include',
         'libvpx_hack_dir': 'third_party/libvpx',
@@ skipping 84 matching lines @@
             'patched-ffmpeg-mt/libavutil/crc.c',
             'patched-ffmpeg-mt/libavutil/eval.c',
             'patched-ffmpeg-mt/libavutil/intfloat_readwrite.c',
             'patched-ffmpeg-mt/libavutil/inverse.c',  # aug 11
             'patched-ffmpeg-mt/libavutil/log.c',
             'patched-ffmpeg-mt/libavutil/lzo.c',
             'patched-ffmpeg-mt/libavutil/mathematics.c',
             'patched-ffmpeg-mt/libavutil/mem.c',
             'patched-ffmpeg-mt/libavutil/pixdesc.c',
             'patched-ffmpeg-mt/libavutil/rational.c',
-            'config/<(ffmpeg_branding)/<(OS)/<(ffmpeg_config)/config.h',
+            'config/<(ffmpeg_branding)/<(os_config)/<(ffmpeg_config)/config.h',
             'config/libavutil/avconfig.h',
           ],
           'include_dirs': [
-            'config/<(ffmpeg_branding)/<(OS)/<(ffmpeg_config)',
+            'config/<(ffmpeg_branding)/<(os_config)/<(ffmpeg_config)',
             'patched-ffmpeg-mt',
             'config',
           ],
           'defines': [
             'HAVE_AV_CONFIG_H',
             '_POSIX_C_SOURCE=200112',
           ],
           'cflags': [
             '-fomit-frame-pointer',
           ],
@@ skipping 231 matching lines @@
                       # TODO(ajwong): When scons is dead, collapse this with the
                       # absolute path entry inside the OS="mac" conditional, and
                       # move it out of the conditionals block altogether.
                       '-l<(asm_library)',
                     ],
                   }],
                   ['use_system_vpx==0', {
                     'ldflags': [
                       '-L<(libvpx_hack_dir)/lib/<(OS)/<(target_arch)',
                     ],
+                  }, {
+                    # Using libvpx provided by the system.
+                    'ldflags': [
+                      '-L/usr/local/lib',

[scherkus (not reviewing), 2010/10/14 19:03:42]

shouldn't this already be in the path?

use_system_vpx just uses -lvpx and assumes that its in your default path

[ruben, 2010/10/14 19:11:35]

Yes, I was surprised it wasn't also, but how would that path get pulled in for
ffmpeg exactly?  ffmpeg.gyp doesn't call any of the pkg-config targets from
build/linux/system.gyp, nor does it invoke pkg-config itself for the flags for
libvpx.  On FreeBSD, that caused a linking failure: has the use_system_vpx flag
been tested on linux?

[scherkus (not reviewing), 2010/10/14 19:40:48]

I think when libvpx was first released they didn't offer a pkg-config (see
comment at top for use_system_vpx)

I'd fine using a pkg-config line similar to use_system_ffmpeg for CFLAGS

+                    ],
                   }],
                 ],
               },
             }],  # OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris"
             ['OS=="mac"', {
               'libraries': [
                 # TODO(ajwong): Move into link_settings when this is fixed:
                 #
                 # http://code.google.com/p/gyp/issues/detail?id=108
                 '<(shared_generated_dir)/<(STATIC_LIB_PREFIX)<(asm_library)<(STATIC_LIB_SUFFIX)',
@@ skipping 453 matching lines @@
       ],  # conditions
     },
   ],  # targets
 }
 
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