[mythtv] Strange distribution-dependent build error

[Scott Theisen]

On 2025/08/06 06:17, Paul Gardiner wrote:
> I have a .spec file that builds mythtv packages for opensuse leap. 
> I've been using it for several years, needing to make only small 
> changes from time to time as leap has moved through various versions. 
> Surprisingly to me, I get this error when I try to use the same .spec 
> file for opensuse tumbleweed:
>
> [  238s] 
> /usr/lib64/gcc/x86_64-suse-linux/13/../../../../x86_64-suse-linux/bin/ld: 
> /tmp/ccf31tRw.ltrans115.ltrans.o: warning: relocation against `pd_1' 
> in read-only section `.text'
> [  238s] 
> /usr/lib64/gcc/x86_64-suse-linux/13/../../../../x86_64-suse-linux/bin/ld: 
> /tmp/ccf31tRw.ltrans115.ltrans.o: relocation R_X86_64_PC32 against 
> undefined symbol `pd_1' can not be used when making a shared object; 
> recompile with -fPIC
>
> This seems to relate to a piece of inline assembly code in 
> mythtv/mythtv/external/FFmpeg/libavcodec/x86/lpc_init.c. I thought 
> -fPIC didn't affect inline assemble, and in any case, I'd imagine that 
> the flags are consistent between leap and tumbleweed.
>
> I'm struggling to find a way forward. Any thoughts?
>
> Cheers,
>     Paul.

Both configure and CMake run FFmpeg/configure with --enable-pic, so that 
is strange since it should already compile with -fPIC.

How do FFmpeg/config.h and FFmpeg/ffbuild/config.mak differ between the 
two builds?  In particular, what are the values of FFMPEG_CONFIGURATION, 
CPPFLAGS, and CFLAGS?

Regards,

Scott