[FFmpeg-devel] [PATCH] ffbuild: use response files only if ar accepts them

[Zhao Zhili]

> On Mar 17, 2025, at 23:16, Gyan Doshi <ffmpeg at gyani.pro> wrote:
> 
> This is to not break linking with toolchains that don't support reading
> args from a 'response file'.
> ---
> I've assumed that ld on a system will have same support as ar.
> 
> configure           | 7 +++++++
> ffbuild/library.mak | 8 ++++++++
> 2 files changed, 15 insertions(+)
> 
> diff --git a/configure b/configure
> index f6964c4ee1..d84e32196d 100755
> --- a/configure
> +++ b/configure
> @@ -5230,6 +5230,12 @@ else
>     ar_o='$@'
> fi
> 
> +if $ar 2>&1 | grep -qi  "@.*file"; then
> +    ar_objs="true"
> +else
> +    ar_objs=""
> +fi

Works for me.

> +
> add_cflags $extra_cflags
> add_cxxflags $extra_cxxflags
> add_objcflags $extra_objcflags
> @@ -8133,6 +8139,7 @@ DEPX86ASM=$x86asmexe
> DEPX86ASMFLAGS=\$(X86ASMFLAGS)
> AR=$ar
> ARFLAGS=$arflags
> +AR_OBJS=$ar_objs
> AR_O=$ar_o
> AR_CMD=$ar
> NM_CMD=$nm
> diff --git a/ffbuild/library.mak b/ffbuild/library.mak
> index 72e3872157..7e1871b74c 100644
> --- a/ffbuild/library.mak
> +++ b/ffbuild/library.mak
> @@ -35,8 +35,12 @@ OBJS += $(SHLIBOBJS)
> endif
> $(SUBDIR)$(LIBNAME): $(OBJS) $(STLIBOBJS)
> 	$(RM) $@
> +ifeq ($(AR_OBJS),true)
> 	$(Q)echo $^ > $@.objs
> 	$(AR) $(ARFLAGS) $(AR_O) @$@.objs
> +else
> +	$(AR) $(ARFLAGS) $(AR_O) $^
> +endif
> 	$(RANLIB) $@
> 	-$(RM) $@.objs
> 
> @@ -68,8 +72,12 @@ $(SUBDIR)$(SLIBNAME): $(SUBDIR)$(SLIBNAME_WITH_MAJOR)
> 
> $(SUBDIR)$(SLIBNAME_WITH_MAJOR): $(OBJS) $(SHLIBOBJS) $(SLIBOBJS) $(SUBDIR)lib$(NAME).ver
> 	$(SLIB_CREATE_DEF_CMD)
> +ifeq ($(AR_OBJS),true)
> 	$(Q)echo $$(filter %.o,$$^) > $$@.objs
> 	$$(LD) $(SHFLAGS) $(LDFLAGS) $(LDSOFLAGS) $$(LD_O) @$$@.objs $(FFEXTRALIBS)
> +else
> +	$$(LD) $(SHFLAGS) $(LDFLAGS) $(LDSOFLAGS) $$(LD_O) $$(filter %.o,$$^) $(FFEXTRALIBS)
> +endif
> 	$(SLIB_EXTRA_CMD)
> 	-$(RM) $$@.objs
> 
> -- 
> 2.46.1
> 
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