[FFmpeg-devel] [PATCH v3] ffbuild: read library linker objects from a file

[Zhao Zhili]

> On Mar 17, 2025, at 19:45, Gyan Doshi <ffmpeg at gyani.pro> wrote:
> 
> 
> 
> On 2025-03-17 05:02 pm, Zhao Zhili wrote:
>> 
>>> On Mar 13, 2025, at 21:02, Gyan Doshi <ffmpeg at gyani.pro> wrote:
>>> 
>>> The linker command can exceed the maximum argument limit on MinGW,
>>> especially for libavcodec.
>>> 
>>> The objects list is now stored in a file and passed to the linker.
>>> ---
>>> v3:
>>>  for reasons unknown to me, static linking doesn't appear to
>>>  work on linux with escaped variables, so removed those.
>>>  Someone please test on linux both static and shared builds.
>>> 
>>> .gitignore          | 1 +
>>> ffbuild/common.mak  | 2 +-
>>> ffbuild/library.mak | 8 ++++++--
>>> 3 files changed, 8 insertions(+), 3 deletions(-)
>>> 
>>> diff --git a/.gitignore b/.gitignore
>>> index 9cfc78b414..430abaf91b 100644
>>> --- a/.gitignore
>>> +++ b/.gitignore
>>> @@ -1,5 +1,6 @@
>>> *.a
>>> *.o
>>> +*.objs
>>> *.o.*
>>> *.d
>>> *.def
>>> diff --git a/ffbuild/common.mak b/ffbuild/common.mak
>>> index 023adb8567..ca45a0f368 100644
>>> --- a/ffbuild/common.mak
>>> +++ b/ffbuild/common.mak
>>> @@ -214,7 +214,7 @@ $(TOOLOBJS): | tools
>>> 
>>> OUTDIRS := $(OUTDIRS) $(dir $(OBJS) $(HOBJS) $(HOSTOBJS) $(SLIBOBJS) $(SHLIBOBJS) $(STLIBOBJS) $(TESTOBJS))
>>> 
>>> -CLEANSUFFIXES     = *.d *.gcda *.gcno *.h.c *.ho *.map *.o *.pc *.ptx *.ptx.gz *.ptx.c *.ver *.version *$(DEFAULT_X86ASMD).asm *~ *.ilk *.pdb
>>> +CLEANSUFFIXES     = *.d *.gcda *.gcno *.h.c *.ho *.map *.o *.objs *.pc *.ptx *.ptx.gz *.ptx.c *.ver *.version *$(DEFAULT_X86ASMD).asm *~ *.ilk *.pdb
>>> LIBSUFFIXES       = *.a *.lib *.so *.so.* *.dylib *.dll *.def *.dll.a
>>> 
>>> define RULES
>>> diff --git a/ffbuild/library.mak b/ffbuild/library.mak
>>> index 793e9d41fa..72e3872157 100644
>>> --- a/ffbuild/library.mak
>>> +++ b/ffbuild/library.mak
>>> @@ -35,8 +35,10 @@ OBJS += $(SHLIBOBJS)
>>> endif
>>> $(SUBDIR)$(LIBNAME): $(OBJS) $(STLIBOBJS)
>>> 	$(RM) $@
>>> -	$(AR) $(ARFLAGS) $(AR_O) $^
>>> +	$(Q)echo $^ > $@.objs
>>> +	$(AR) $(ARFLAGS) $(AR_O) @$@.objs
>> @file doesn’t supported by ar on macOS or BSD.
> 
> Do we have any FATE clients on these platforms?

I remember there were apple machines, but they are not there now.

https://fate.ffmpeg.org/

Can we add CI machine and workflow to code.ffmpeg.org <http://code.ffmpeg.org/> now?

> 
> I guess we can use  some guard (which?) to define an alternate recipe.
> 
> Regards,
> Gyan
> 
> 
>> 
>>> 	$(RANLIB) $@
>>> +	-$(RM) $@.objs
>>> 
>>> install-headers: install-lib$(NAME)-headers install-lib$(NAME)-pkgconfig
>>> 
>>> @@ -66,8 +68,10 @@ $(SUBDIR)$(SLIBNAME): $(SUBDIR)$(SLIBNAME_WITH_MAJOR)
>>> 
>>> $(SUBDIR)$(SLIBNAME_WITH_MAJOR): $(OBJS) $(SHLIBOBJS) $(SLIBOBJS) $(SUBDIR)lib$(NAME).ver
>>> 	$(SLIB_CREATE_DEF_CMD)
>>> -	$$(LD) $(SHFLAGS) $(LDFLAGS) $(LDSOFLAGS) $$(LD_O) $$(filter %.o,$$^) $(FFEXTRALIBS)
>>> +	$(Q)echo $$(filter %.o,$$^) > $$@.objs
>>> +	$$(LD) $(SHFLAGS) $(LDFLAGS) $(LDSOFLAGS) $$(LD_O) @$$@.objs $(FFEXTRALIBS)
>>> 	$(SLIB_EXTRA_CMD)
>>> +	-$(RM) $$@.objs
>>> 
>>> ifdef SUBDIR
>>> $(SUBDIR)$(SLIBNAME_WITH_MAJOR): $(DEP_LIBS)
>>> -- 
>>> 2.46.1
>>> 
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