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From: "slyfox at inbox dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug preprocessor/94657] New: [patch] libcpp uses 'AR = ar' tool
 even if --build/--host are passed explicitly.
Date: Sun, 19 Apr 2020 09:41:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94657

            Bug ID: 94657
           Summary: [patch] libcpp uses 'AR =3D ar' tool even if
                    --build/--host are passed explicitly.
           Product: gcc
           Version: 9.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
          Assignee: unassigned at gcc dot gnu.org
          Reporter: slyfox at inbox dot ru
  Target Milestone: ---

Created attachment 48305
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D48305&action=3Dedit
libcpp-ar.patch

Initially reported by Agostino Sarubbo as https://bugs.gentoo.org/718004.

There Gentoo builds gcc-9.3.0 as:
    --host=3Dx86_64-pc-linux-gnu --build=3Dx86_64-pc-linux-gnu
and observes 'ar' being called by libcpp. It should be 'x86_64-pc-linux-gnu=
-ar'
instead.

libcpp/Makefile.in hardcodes 'AR =3D ar' (but does not hardcode RANLIB for
example:  'RANLIB =3D @RANLIB@').=20

A few other tools do it:

  $ git grep 'AR =3D ar' | cat
  gcc/ada/gcc-interface/Makefile.in:AR =3D ar
  intl/Makefile.in:AR =3D ar
  libcpp/Makefile.in:AR =3D ar
  libdecnumber/Makefile.in:AR =3D ar

but only libcpp refers 'ar' and fails build when 'ar' does not exist:

  ar cru libcpp.a charset.o directives.o directives-only.o errors.o expr.o
files.o identifiers.o init.o lex.o line-map.o macro.o mkdeps.o pch.o symtab=
.o
traditional.o
  /bin/bash: ar: command not found

Attached patch adds AR detection similar to other libraries.

But maybe it should be set in top-level Makefile?=