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[Bug target/16416] New: [3.4/3.5 regression] -m64 doesn't imply -mcpu=v9 anymore


On the 3.3 branch:

[eric@localhost obj.sparc]$ gcc/xgcc -Bgcc -S -### t.c -m64
Reading specs from gcc/specs
Configured with: ../configure --host=i586-redhat-linux-gnu
--target=sparc-sun-solaris2.8 --prefix=/usr/local
--enable-checking=misc,tree,rtlflag --enable-languages=c,c++
Thread model: posix
gcc version 3.3.5 20040703 (prerelease)
 "gcc/cc1" "-quiet" "-iprefix"
"/home/eric/cvs/gcc-3_3-branch/obj.sparc/gcc/../lib/gcc-lib/sparc-sun-solaris2.8/3.3.5/"
"-isystem" "gcc/include" "-D__GNUC__=3" "-D__GNUC_MINOR__=3"
"-D__GNUC_PATCHLEVEL__=5" "-Dsparc" "-D__sparc__" "-D__sparc" "-D__arch64__"
"-Acpu=sparc64" "-Amachine=sparcv9" "-D__sparcv9" "t.c" "-mptr64" "-mstack-bias"
"-mno-v8plus" "-mcpu=v9" "-quiet" "-dumpbase" "t.c" "-m64" "-auxbase" "t" "-o" "t.s"


On the 3.4 branch and up:

[eric@localhost obj.sparc]$ gcc/xgcc -Bgcc -S -### t.c -m64
Reading specs from gcc/specs
Configured with: ../configure --host=i586-redhat-linux-gnu
--target=sparc-sun-solaris2.8 --prefix=/usr/local
--enable-checking=misc,tree,rtlflag --enable-languages=c,c++
Thread model: posix
gcc version 3.4.2 20040706 (prerelease)
 "gcc/cc1" "-quiet" "-iprefix"
"/home/eric/cvs/gcc-3_4-branch/obj.sparc/gcc/../lib/gcc/sparc-sun-solaris2.8/3.4.2/"
"-isystem" "gcc/include" "-D__arch64__" "-D__sparcv9" "t.c" "-mptr64"
"-mstack-bias" "-mno-v8plus" "-quiet" "-dumpbase" "t.c" "-m64" "-mcpu=v7"
"-auxbase" "t" "-o" "t.s"

which I find stupid.

This comes from the --with-cpu mechanism at configure time, which defaults to v7
on sparc-*-*, so the driver behaves as if -mcpu=v7 were passed.

-- 
           Summary: [3.4/3.5 regression] -m64 doesn't imply -mcpu=v9 anymore
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ebotcazou at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: sparc-sun-solaris2.[789]
  GCC host triplet: sparc-sun-solaris2.[789]
GCC target triplet: sparc-sun-solaris2.[789]


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16416


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