[FFmpeg-devel] [PATCH 2/2] configure: add option to select use of response files

[Ramiro Polla]

Hi,

On Fri, Mar 21, 2025 at 11:42 AM Gyan Doshi <ffmpeg at gyani.pro> wrote:
>
> ---
>  configure           | 27 ++++++++++++++++++++-------
>  ffbuild/library.mak |  4 ++--
>  2 files changed, 22 insertions(+), 9 deletions(-)
>
> diff --git a/configure b/configure
> index 14f7bcde0e..863b9adf22 100755
> --- a/configure
> +++ b/configure
> @@ -427,6 +427,8 @@ Toolchain options:
>    --enable-thumb           compile for Thumb instruction set
>    --enable-lto[=arg]       use link-time optimization
>    --env="ENV=override"     override the environment variables
> +  --response-files=ARG     Pass list of objects to linker in a file to avoid command line length limits
> +                           Valid values are: yes, no, auto(default)

I think --disable-response-files with default [autodetect] would be
more in line with the other options in configure.

>  Advanced options (experts only):
>    --malloc-prefix=PREFIX   prefix malloc and related names with PREFIX
> @@ -4142,6 +4144,7 @@ objformat="elf32"
>  x86asmexe_default="nasm"
>  windres_default="windres"
>  striptype="direct"
> +ar_objs_default="auto"
>
>  # OS
>  target_os_default=$(tolower $(uname -s))
> @@ -4438,6 +4441,10 @@ for opt do
>          --enable-lto*)
>              lto=-f${opt#--enable-}
>          ;;
> +        --response-files=*)
> +            ar_objs=$optval
> +            is_in $ar_objs "yes no auto" || die "Invalid value for response-files: $optval; Valid values are: yes, no, or auto"
> +        ;;
>          --enable-*=*|--disable-*=*)
>              eval $(echo "${opt%%=*}" | sed 's/--/action=/;s/-/ thing=/')
>              is_in "${thing}s" $COMPONENT_LIST || die_unknown "$opt"
> @@ -5187,7 +5194,7 @@ test -n "$cc_type" && enable $cc_type ||
>  : ${dep_cc_default:=$cc}
>  : ${ld_default:=$cc}
>  : ${host_ld_default:=$host_cc}
> -set_default ar as objcc dep_cc ld ln_s host_ld windres
> +set_default ar as objcc dep_cc ld ln_s host_ld windres ar_objs
>
>  probe_cc as "$as"
>  asflags_filter=$_flags_filter
> @@ -7753,12 +7760,18 @@ case $ld_type in
>      ;;
>  esac
>
> -{
> -ar_out=${FFTMPDIR}/test$LIBSUF
> -respfile="@/dev/null"
> -out_arg="$(echo $ar_o | sed "s;\$@;$ar_out;g")"
> -test_cmd $ar $arflags $out_arg $respfile && ar_objs="true" || ar_objs=""
> -}
> +if [ "$ar_objs" != "no" ]; then
> +    ar_out=${FFTMPDIR}/test$LIBSUF
> +    respfile="@/dev/null"
> +    out_arg="$(echo $ar_o | sed "s;\$@;$ar_out;g")"
> +    if test_cmd $ar $arflags $out_arg $respfile; then
> +        ar_objs="yes"
> +    elif [ "$ar_objs" = "auto" ]; then
> +        ar_objs="no"
> +    else
> +        die "Response files are not available with this toolchain. Exiting"
> +    fi
> +fi
>
>  enable frame_thread_encoder
>
> diff --git a/ffbuild/library.mak b/ffbuild/library.mak
> index 15302852ec..50a4cf74f2 100644
> --- a/ffbuild/library.mak
> +++ b/ffbuild/library.mak
> @@ -35,7 +35,7 @@ OBJS += $(SHLIBOBJS)
>  endif
>  $(SUBDIR)$(LIBNAME): $(OBJS) $(STLIBOBJS)
>         $(RM) $@
> -ifeq ($(AR_OBJS),true)
> +ifeq ($(AR_OBJS),yes)
>         -$(RM) $@.objs
>         $(Q)$(foreach ARG,$^,echo -n "$(ARG) " >> $@.objs;)
>         $(AR) $(ARFLAGS) $(AR_O) @$@.objs
> @@ -73,7 +73,7 @@ $(SUBDIR)$(SLIBNAME): $(SUBDIR)$(SLIBNAME_WITH_MAJOR)
>
>  $(SUBDIR)$(SLIBNAME_WITH_MAJOR): $(OBJS) $(SHLIBOBJS) $(SLIBOBJS) $(SUBDIR)lib$(NAME).ver
>         $(SLIB_CREATE_DEF_CMD)
> -ifeq ($(AR_OBJS),true)
> +ifeq ($(AR_OBJS),yes)
>         -$(RM) $$@.objs
>         $(Q)$(eval LDARGS=$$(filter %.o,$$^))
>         $(Q)$(foreach ARG,$$(LDARGS),echo -n "$(ARG) " >> $$@.objs;)

Could you rename AR_OBJS to something like RESPONSE_FILES?

Ramiro