[Bug ld/26766] Support standalone PGO build

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26766

--- Comment #15 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to H.J. Lu from comment #13)
> (In reply to Martin Liska from comment #12)
> 
> > 
> > I can fix it with the following change:
> > 
> > diff -u gas/Makefile.orig gas/Makefile
> > --- gas/Makefile.orig       2020-10-26 18:41:45.992955514 +0100
> > +++ gas/Makefile    2020-10-26 18:42:21.976647698 +0100
> > @@ -1081,8 +1081,8 @@
> >     config/$(DEPDIR)/$(am__dirstamp)
> >  
> >  as-new$(EXEEXT): $(as_new_OBJECTS) $(as_new_DEPENDENCIES)
> > $(EXTRA_as_new_DEPENDENCIES) 
> > -   @rm -f as-new$(EXEEXT)
> > -   $(AM_V_CCLD)$(LINK) $(as_new_OBJECTS) $(as_new_LDADD) $(LIBS)
> > +   + @rm -f as-new$(EXEEXT)
> > +   + $(AM_V_CCLD)$(LINK) $(as_new_OBJECTS) $(as_new_LDADD) $(LIBS)
> >  
> >  itbl-test$(EXEEXT): $(itbl_test_OBJECTS) $(itbl_test_DEPENDENCIES)
> > $(EXTRA_itbl_test_DEPENDENCIES) 
> >     @rm -f itbl-test$(EXEEXT)
> > 
> > but I don't know how to modify the original gas/Makefile.am
> > ?
> 
> I will fix it.

It works for me with GNU make 4.2.1:

/bin/sh ./libtool  --tag=CC   --mode=link cc -W -Wall -Wstrict-prototypes
-Wmissing-prototypes -Wshadow -Wstack-usage=262144 -Wwrite-strings  -O2 -g  
-fcf-protection    -fprofile-generate -flto=jobserver   -o as-new app.o as.o
atof-generic.o compress-debug.o cond.o depend.o dwarf2dbg.o dw2gencfi.o ecoff.o
ehopt.o expr.o flonum-copy.o flonum-konst.o flonum-mult.o frags.o hash.o
input-file.o input-scrub.o listing.o literal.o macro.o messages.o output-file.o
read.o remap.o sb.o stabs.o subsegs.o symbols.o write.o config/tc-i386.o
config/obj-elf.o config/atof-ieee.o  ../opcodes/libopcodes.la ../bfd/libbfd.la
../libiberty/libiberty.a   -ldl
libtool: link: cc -W -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow
-Wstack-usage=262144 -Wwrite-strings -O2 -g -fcf-protection -fprofile-generate
-flto=jobserver -o as-new app.o as.o atof-generic.o compress-debug.o cond.o
depend.o dwarf2dbg.o dw2gencfi.o ecoff.o ehopt.o expr.o flonum-copy.o
flonum-konst.o flonum-mult.o frags.o hash.o input-file.o input-scrub.o
listing.o literal.o macro.o messages.o output-file.o read.o remap.o sb.o
stabs.o subsegs.o symbols.o write.o config/tc-i386.o config/obj-elf.o
config/atof-ieee.o  ../opcodes/.libs/libopcodes.a ../bfd/.libs/libbfd.a -lz
../libiberty/libiberty.a -ldl
/export/gnu/import/git/gitlab/x86-binutils/libiberty/make-relative-prefix.c: In
function 'make_relative_prefix_1.constprop':
/export/gnu/import/git/gitlab/x86-binutils/libiberty/make-relative-prefix.c:230:1:
warning: stack usage might be unbounded [-Wstack-usage=]
  230 | make_relative_prefix_1 (const char *progname, const char *bin_prefix,
      | ^
make[6]: Leaving directory
'/export/build/gnu/tools-build/binutils-pgo/build-x86_64-linux/gas'

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