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From: "sagebar at web dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug driver/110607] New: Makefile.in build broken build-tools when
 CXXFLAGS is defined
Date: Sun, 09 Jul 2023 18:31:32 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: driver
X-Bugzilla-Version: 12.1.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: sagebar at web dot de
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110607

            Bug ID: 110607
           Summary: Makefile.in build broken build-tools when CXXFLAGS is
                    defined
           Product: gcc
           Version: 12.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sagebar at web dot de
  Target Milestone: ---

This part in the main makefile:

> 177 # These variables must be set on the make command line for directories
> 178 # built for the build system to override those in BASE_FLAGS_TO_PASS.
> 179 EXTRA_BUILD_FLAGS =3D \
> 180         CFLAGS=3D"$(CFLAGS_FOR_BUILD)" \
> 181         LDFLAGS=3D"$(LDFLAGS_FOR_BUILD)"

Should instead be:

> 177 # These variables must be set on the make command line for directories
> 178 # built for the build system to override those in BASE_FLAGS_TO_PASS.
> 179 EXTRA_BUILD_FLAGS =3D \
> 180         CFLAGS=3D"$(CFLAGS_FOR_BUILD)" \
> 181         CXXFLAGS=3D"$(CXXFLAGS_FOR_BUILD)" \
> 182         LDFLAGS=3D"$(LDFLAGS_FOR_BUILD)"

Since some components of the build system are compiled as c++, if one wants=
 to
define custom CXX-flags in cross-compilation situations, these flags then a=
lso
get used when building build-tools (which causes breakage)=