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From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/67030] New: [6 Regression] ARM bootstrap failure due to [-Werror=tautological-compare]
Date: Mon, 27 Jul 2015 15:58:00 -0000
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X-Bugzilla-Component: bootstrap
X-Bugzilla-Version: 6.0
X-Bugzilla-Keywords: build
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67030

            Bug ID: 67030
           Summary: [6 Regression] ARM bootstrap failure due to
                    [-Werror=tautological-compare]
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: build
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ktkachov at gcc dot gnu.org
                CC: mpolacek at gcc dot gnu.org
  Target Milestone: ---
            Target: arm

I'm getting a bootstrap failure in stage 2 on arm-none-linux-gnueabihf due to
the new warning:
$SRC/gcc/cfgexpand.c: In function 'long long int expand_one_var(tree, bool,
bool)':
$SRC/gcc/defaults.h:1156:55: error: self-comparison always evaluates to false
[-Werror=tautological-compare]
 #define SUPPORTS_STACK_ALIGNMENT (MAX_STACK_ALIGNMENT > STACK_BOUNDARY)

Seems we need to be a bit smarter when it comes to macro expansions?