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

[Zhao Zhili <quinkblack-at-foxmail.com@ffmpeg.org>]

> On Mar 13, 2025, at 21:02, Gyan Doshi <ffmpeg@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.

> 	$(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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