Re: [PATCH] newlib: libm: workaround ar duplicate member behavior

[Joel Sherrill <joel@rtems.org>]

Could this be de-duped with the gnu make sort command? That would avoid the
copy.

Alternatively, I see some awk one liners on the web to uniq the set. Or
just invoke uniq.

--joel

On Mon, Feb 21, 2022, 2:43 PM Mike Frysinger <vapier@gentoo.org> wrote:

> GNU ar has undocumented behavior where it doesn't dedupe its inputs if
> they're all on the same command line, so we have to dedupe ourselves.
> ---
>  newlib/Makefile.am | 16 ++++++++++++++++
>  newlib/Makefile.in | 15 ++++++++++-----
>  2 files changed, 26 insertions(+), 5 deletions(-)
>
> diff --git a/newlib/Makefile.am b/newlib/Makefile.am
> index 80256952da3d..5bbe266cc4d5 100644
> --- a/newlib/Makefile.am
> +++ b/newlib/Makefile.am
> @@ -124,6 +124,22 @@ libm_a_CCASFLAGS = $(AM_CCASFLAGS)
> $(libm_a_CCASFLAGS_$(subst /,_,$(@D))) $(libm
>  libm_a_CPPFLAGS = $(AM_CPPFLAGS) -I$(srcdir)/libm/common
> $(libm_a_CPPFLAGS_$(subst /,_,$(@D))) $(libm_a_CPPFLAGS_$(subst
> /,_,$(@D)_$(<F)))
>  $(libm_a_OBJECTS): stmp-targ-include
>
> +## GNU ar has undocumented behavior when specifying the same name
> multiple times
> +## in a single invocation, so we have to dedupe ourselves by copying
> objects to
> +## a temporary directory.  We start with using ln to create fast
> hardlinks.  If
> +## that fails, GNU cp has annoying behavior where you can't copy multiple
> files
> +## to the same target filename, so have to run cp for each input in a
> loop.
> +## https://sourceware.org/PR28917
> +libm.a: $(libm_a_OBJECTS) $(libm_a_DEPENDENCIES)
> +       $(AM_V_at)rm -rf $@ $@.tmp && mkdir $@.tmp
> +       $(AM_V_AR)if ! ln $(libm_a_OBJECTS) $@.tmp/ 2>/dev/null; then \
> +          rm -f $@.tmp/*; \
> +          for o in $(libm_a_OBJECTS); do cp $$o $@.tmp/ || exit $$?;
> done; \
> +          fi; \
> +          $(AR) $(ARFLAGS) $@ $@.tmp/*.o
> +       $(AM_V_at)rm -rf $@.tmp
> +       $(AM_V_at)$(RANLIB) $@
> +
>  if HAVE_MULTISUBDIR
>  $(BUILD_MULTISUBDIR):
>         $(MKDIR_P) $@
> diff --git a/newlib/Makefile.in b/newlib/Makefile.in
> index 2b60ef1ca96c..84f3e0cbde37 100644
> --- a/newlib/Makefile.in
> +++ b/newlib/Makefile.in
> @@ -3248,11 +3248,6 @@ libm/machine/x86_64/libm_a-fetestexcept.$(OBJEXT):
> \
>  libm/machine/x86_64/libm_a-feupdateenv.$(OBJEXT):  \
>         libm/machine/x86_64/$(am__dirstamp)
>
> -libm.a: $(libm_a_OBJECTS) $(libm_a_DEPENDENCIES)
> $(EXTRA_libm_a_DEPENDENCIES)
> -       $(AM_V_at)-rm -f libm.a
> -       $(AM_V_AR)$(libm_a_AR) libm.a $(libm_a_OBJECTS) $(libm_a_LIBADD)
> -       $(AM_V_at)$(RANLIB) libm.a
> -
>  mostlyclean-compile:
>         -rm -f *.$(OBJEXT)
>         -rm -f libm/common/*.$(OBJEXT)
> @@ -8650,6 +8645,16 @@ libg.a: libc.a
>         $(AM_V_GEN)ln libc.a libg.a >/dev/null 2>/dev/null || cp libc.a
> libg.a
>  $(libm_a_OBJECTS): stmp-targ-include
>
> +libm.a: $(libm_a_OBJECTS) $(libm_a_DEPENDENCIES)
> +       $(AM_V_at)rm -rf $@ $@.tmp && mkdir $@.tmp
> +       $(AM_V_AR)if ! ln $(libm_a_OBJECTS) $@.tmp/ 2>/dev/null; then \
> +          rm -f $@.tmp/*; \
> +          for o in $(libm_a_OBJECTS); do cp $$o $@.tmp/ || exit $$?;
> done; \
> +          fi; \
> +          $(AR) $(ARFLAGS) $@ $@.tmp/*.o
> +       $(AM_V_at)rm -rf $@.tmp
> +       $(AM_V_at)$(RANLIB) $@
> +
>  @HAVE_MULTISUBDIR_TRUE@$(BUILD_MULTISUBDIR):
>  @HAVE_MULTISUBDIR_TRUE@        $(MKDIR_P) $@
>
> --
> 2.34.1
>
>