[Libav-user] dependency on external libs on Mac

[Anshul]

On May 10, 2014 8:05:00 AM IST, YIRAN LI <mrfun.china at gmail.com> wrote:
>Hi
>
>I'm building ffmpeg-2.2.2 with libspeex on Mac.
>
>Libspeex is built using ./configure --enable-shared
>--prefix=/Users/liyiran/test/libs
>
>Ffmpeg is built using ./configure --enable-shared --disable-static
>--extra-cflags="-I/Users/liyiran/test/libs/include"
>--extra-ldflags="-L/Users/liyiran/test/libs/lib" --enable-libspeex
>
>But the problem is, every dylib generated depends on libspeex (When I
>built
>on Windows, only libavcodec.dll depends on libspeex instead).
>
>For example
>
>libswresample.0.dylib:
>
>/usr/local/lib/libswresample.0.dylib (compatibility version 0.0.0,
>current
>version 0.18.100)
>
>/usr/local/lib/libavutil.52.dylib (compatibility version 52.0.0,
>current
>version 52.66.100)
>
>/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
>(compatibility version 150.0.0, current version 855.14.0)
>
>/System/Library/Frameworks/VideoDecodeAcceleration.framework/Versions/A/VideoDecodeAcceleration
>(compatibility version 1.0.0, current version 1.0.0)
>
>/System/Library/Frameworks/QuartzCore.framework/Versions/A/QuartzCore
>(compatibility version 1.2.0, current version 1.8.0)
>
>/usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version
>7.0.0)
>
>/Users/liyiran/test/libs/lib/libspeex.1.dylib (compatibility version
>7.0.0,
>current version 7.0.0)
>
>/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
>version
>1197.1.1)
>
>/usr/lib/libbz2.1.0.dylib (compatibility version 1.0.0, current version
>1.0.5)
>
>/usr/lib/libz.1.dylib (compatibility version 1.0.0, current version
>1.2.5)
>
>
>Is there any way to configure so that each component only links with
>libspeex if it really uses it? I tried
>--extra-ldflags="-Wl,--as-needed"
>but met an error:
>
>
>gcc is unable to create an executable file.
>
>If gcc is a cross-compiler, use the --enable-cross-compile option.
>
>Only do this if you know what cross compiling means.
>
>C compiler test failed.
>
>
>And I found an article here saying that "-Wl,-as-needed has bug when
>using
>in auto tools project".
>https://sigquit.wordpress.com/2011/02/16/why-asneeded-doesnt-work-as-expected-for-your-libraries-on-your-autotools-project/
>I
>know ffmpeg is not an auto tool project, but is it possible to have the
>similar problem?
>
>
>Thanks
>
>
>------------------------------------------------------------------------
>
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FFmpeg is not autotool project, dont know about libspeex
-Anshul
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