[Bug debug/43750] New: -march unconditionally added to COLLECT_GCC_OPTIONS

["jue at jue dot li" <gcc-bugzilla at gcc dot gnu dot org>]

As of 4.5.0 -march is always added to COLLECT_GCC_OPTIONS if gcc is not called
with that option.

$> echo '' | gcc -v -E - 2>&1 | grep -E '^(COLLECT_GCC_OPTIONS|gcc)'
gcc version 4.5.0 20100406 (prerelease) (CRUX) (GCC)
COLLECT_GCC_OPTIONS='-v' '-E' '-mtune=generic' '-march=pentiumpro'

the same with gcc 4.4.3:

$> echo '' | gcc -v -E - 2>&1 | grep -E '^(gcc|COLLECT_GCC_OPTIONS)'
gcc version 4.4.3 (CRUX) (GCC)
COLLECT_GCC_OPTIONS='-v' '-E' '-mtune=generic'

I run into that because I'm not able to compile glibc on i686 without explicit
setting CC to something like "gcc -march=i586".
The reason is the well known _i686 problem, see [1] for a exact description of
my error and [2] for a very old but recently reopen glibc bug.


[1] http://www.eglibc.org/archives/patches/msg00073.html
[2] http://sources.redhat.com/bugzilla/show_bug.cgi?id=411


-- 
           Summary: -march unconditionally added to COLLECT_GCC_OPTIONS
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jue at jue dot li
 GCC build triplet: i686-pc-linux
  GCC host triplet: i686-pc-linux
GCC target triplet: i686-pc-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43750