[FFmpeg-trac] #7785(build system:new): [Android] Configure script: Wrong HAVE_ macros are created due to "-f may not be used without -shared" error

[FFmpeg]

#7785: [Android] Configure script: Wrong HAVE_ macros are created due to "-f may
not be used without -shared" error
-------------------------------------+-------------------------------------
             Reporter:  ESt          |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  build        |                  Version:  git-
  system                             |  master
             Keywords:  Android,     |               Blocked By:
  shared, configure, ld, HAVE        |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 While building for Android the configuration script seems to create some
 wrong HAVE_ macros, e. g. #define HAVE_ATANF 0, HAVE_CBRT 0,
 HAVE_LOCALTIME_R 0, etc. Which later on causes issues with the build
 itself, e.g.:

 {{{
 ./libavutil/libm.h:61:31: error: static declaration of 'cbrtf' follows
 non-static declaration
 static av_always_inline float cbrtf(float x)
 }}}

 The source of the problem seems to be that the 'test_ld' function throws
 the following error for those functions "-f may not be used without
 -shared". I've added ''$(if [ shared="yes" ] ; then echo "-shared" ; fi)''
 to the last line of test_ld, and it seemed to fix the problem for that
 build:
 (I'm not submitting a patch since I'm not sure this is the way the problem
 should be solved and I'm afraid it might cause errors with other builds)

 {{{
 test_ld(){
     log test_ld "$@"
     type=$1
     shift 1
     flags=$(filter_out '-l*|*.so' $@)
     libs=$(filter '-l*|*.so' $@)
     test_$type $($cflags_filter $flags) || return
     flags=$($ldflags_filter $flags)
     libs=$($ldflags_filter $libs)
     test_cmd $ld $LDFLAGS $LDEXEFLAGS $flags $(ld_o $TMPE) $TMPO $libs
 $extralibs $(if [ shared="yes" ] ; then echo "-shared" ; fi)
 }
 }}}



 How to reproduce:
 {{{
 The configure command I ran was:
 ./configure --prefix=android/arm64-v8a --disable-asm --enable-cross-
 compile --disable-static --disable-programs --disable-doc --enable-shared
 --enable-protocol=file --enable-pic --enable-small --disable-pthreads
 --ar=/home/es/Android/Sdk/ndk-bundle//toolchains/aarch64-linux-
 android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-ar
 --strip=/home/es/Android/Sdk/ndk-bundle//toolchains/aarch64-linux-
 android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-strip
 --ld=/home/es/Android/Sdk/ndk-bundle//toolchains/aarch64-linux-
 android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-ld
 --cc=/home/es/Android/Sdk/ndk-bundle//toolchains/llvm/prebuilt/linux-
 x86_64/bin/clang --cxx=/home/es/Android/Sdk/ndk-
 bundle//toolchains/llvm/prebuilt/linux-x86_64/bin/clang++
 --as=/home/es/Android/Sdk/ndk-bundle//toolchains/llvm/prebuilt/linux-
 x86_64/bin/clang --target-os=android --extra-cflags='-target aarch64-none-
 linux-android -mfpu=neon -mfloat-abi=soft -I/home/es/Android/Sdk/ndk-
 bundle//sysroot/usr/include/aarch64-linux-android -O3 -fPIC' --extra-
 ldflags='-L/home/es/Android/Sdk/ndk-bundle//toolchains/aarch64-linux-
 android-4.9/prebuilt/linux-x86_64/lib/gcc/aarch64-linux-android/4.9.x
 -L/home/es/Android/Sdk/ndk-bundle//platforms/android-21/arch-arm64/usr/lib
 -lc' --sysroot=/home/es/Android/Sdk/ndk-bundle//sysroot --extra-libs=-lgcc
 Then I ran 'make' and got the make error above (or you can see the ld
 error in the config log or the macros in config.h)
 }}}

 My NDK version is r19b and my OS is Arch-Linux
 I'll attach the config.log in the files of this ticket

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7785>
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