[Bug other/55925] New: Unrecognized command line option '-mfxsr' when building x86_64-w64-mingw32 native compiler

[Bug other/55925] New: Unrecognized command line option '-mfxsr' when building x86_64-w64-mingw32 native compiler

[lailavrazda1979 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55925

             Bug #: 55925
           Summary: Unrecognized command line option '-mfxsr' when
                    building x86_64-w64-mingw32 native compiler
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: other
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: lailavrazda1979@gmail.com


When building a native x86_64-w64-mingw32 compiler using a 4.7.2 cross
compiler, I get the following:

x86_64-w64-mingw32-gcc -L/root/win64-build/native/x86_64-w64-mingw32/lib
-L/root/win64-build/native/mingw/lib -isystem
/root/win64-build/native/x86_64-w64-mingw32/include -isystem
/root/win64-build/native/mingw/include    -g -O2 -O2  -g -O2 -DIN_GCC   -W
-Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition  -isystem ./include   -g
-DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector   -I. -I. -I../.././gcc
-I../../../gcc-4.8.0/libgcc -I../../../gcc-4.8.0/libgcc/.
-I../../../gcc-4.8.0/libgcc/../gcc -I../../../gcc-4.8.0/libgcc/../include
-I../../../gcc-4.8.0/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
-DHAVE_CC_TLS -DUSE_EMUTLS -o crtfastmath.o -MT crtfastmath.o -MD -MP -MF
crtfastmath.dep -mfxsr -msse -c
../../../gcc-4.8.0/libgcc/config/i386/crtfastmath.c
x86_64-w64-mingw32-gcc: error: unrecognized command line option '-mfxsr'
make[2]: *** [crtfastmath.o] Error 1
make[2]: Leaving directory
`/root/win64-build/src/gcc-build/x86_64-w64-mingw32/libgcc'
make[1]: *** [all-target-libgcc] Error 2
make[1]: Leaving directory `/root/win64-build/src/gcc-build'
make: *** [all] Error 2

I can't find any documentation at all on this '-mfxsr' option. What is it, and
why is it being used here?

[Bug other/55925] Unrecognized command line option '-mfxsr' when building x86_64-w64-mingw32 native compiler

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55925

--- Comment #1 from Uros Bizjak <ubizjak at gmail dot com> 2013-01-13 13:39:25 UTC ---
(In reply to comment #0)
> When building a native x86_64-w64-mingw32 compiler using a 4.7.2 cross
> compiler, I get the following:
> 
> x86_64-w64-mingw32-gcc -L/root/win64-build/native/x86_64-w64-mingw32/lib

[...]

> I can't find any documentation at all on this '-mfxsr' option. What is it, and
> why is it being used here?

crtfastmath.c should be compiled with newly built compiler. "-mfxsr" option is
used to compile __builtin_ia32_fxsave builtin to fxsr instruction, newly built
compiler will recognize this option.

How did you configure gcc?

[Bug other/55925] Unrecognized command line option '-mfxsr' when building x86_64-w64-mingw32 native compiler

[lailavrazda1979 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55925

--- Comment #2 from lailavrazda1979 at gmail dot com 2013-01-13 23:31:01 UTC ---
How did I configure which GCC? The cross compiler or the native one?

[Bug other/55925] Unrecognized command line option '-mfxsr' when building x86_64-w64-mingw32 native compiler

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55925

--- Comment #3 from Uros Bizjak <ubizjak at gmail dot com> 2013-01-14 13:37:14 UTC ---
(In reply to comment #2)
> How did I configure which GCC? The cross compiler or the native one?

The crosscompiler.

[Bug other/55925] Unrecognized command line option '-mfxsr' when building x86_64-w64-mingw32 native compiler

[lailavrazda1979 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55925

--- Comment #4 from lailavrazda1979 at gmail dot com 2013-01-14 21:26:36 UTC ---
I tried building several compilers (4.7.2), none of which understand the
'-mfxsr' option. One was configured with:

../gcc-4.7.2/configure --build=x86_64-unknown-linux-gnu
--host=x86_64-unknown-linux-gnu --target=x86_64-w64-mingw32 --prefix=$CROSS_DIR
--libexecdir=$CROSS_DIR/lib --enable-clocale=gnu --enable-__cxa_atexit
--enable-languages=c,c++ --enable-targets=all --enable-cloog-backend=ppl
--disable-shared --disable-nls --disable-werror --with-host-libstdcxx="-lstdc++
-lsupc++" --with-local-prefix=$CROSS_DIR --with-sysroot=$CROSS_DIR
--with-ppl=$CROSS_DIR --with-cloog=$CROSS_DIR
make all-gcc && make install-gcc

After that, I build the mingw-w64 library, went back to my GCC build dir, and
did:
make && make install

[Bug other/55925] Unrecognized command line option '-mfxsr' when building x86_64-w64-mingw32 native compiler

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55925

--- Comment #5 from Uros Bizjak <ubizjak at gmail dot com> 2013-01-14 21:53:16 UTC ---
(In reply to comment #4)
> I tried building several compilers (4.7.2), none of which understand the
> '-mfxsr' option. One was configured with:

True. -mfxsr option was added to 4.8.0.

After that, I build the mingw-w64 library, went back to my GCC build dir, and
did:
make && make install

This command should first build a 4.8.0 crosscompiler, and then compile the
library with the newly built compiler. The command should look like:

/home/uros/gcc-build/./gcc/xgcc -B/home/uros/gcc-build/./gcc/
-B/usr/local/x86_64-unknown-linux-gnu/bin/
-B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem
/usr/local/x86_64-unknown-linux-gnu/include -isystem
/usr/local/x86_64-unknown-linux-gnu/sys-include    -g -O2 -O2  -g -O2 -DIN_GCC 
 -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition  -isystem ./include   -fpic
-mlong-double-80 -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector   -fpic
-mlong-double-80 -I. -I. -I../.././gcc -I../../../gcc-svn/trunk/libgcc
-I../../../gcc-svn/trunk/libgcc/. -I../../../gcc-svn/trunk/libgcc/../gcc
-I../../../gcc-svn/trunk/libgcc/../include
-I../../../gcc-svn/trunk/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
-DHAVE_CC_TLS  -DUSE_TLS -o crtfastmath.o -MT crtfastmath.o -MD -MP -MF
crtfastmath.dep -mfxsr -msse -c
../../../gcc-svn/trunk/libgcc/config/i386/crtfastmath.c

As you can see, using -mfxsr does not fail here.

[Bug other/55925] Unrecognized command line option '-mfxsr' when building x86_64-w64-mingw32 native compiler

[lailavrazda1979 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55925

--- Comment #6 from lailavrazda1979 at gmail dot com 2013-01-14 23:18:30 UTC ---
So, you need GCC 4.8 to build GCC 4.8? That's just... why? Doesn't that mean
it's basically impossible to build GCC 4.8 without a binary of it first?

[Bug other/55925] Unrecognized command line option '-mfxsr' when building x86_64-w64-mingw32 native compiler

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55925

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> 2013-01-14 23:32:17 UTC ---
(In reply to comment #6)
> So, you need GCC 4.8 to build GCC 4.8? That's just... why? Doesn't that mean
> it's basically impossible to build GCC 4.8 without a binary of it first?

No you need a 4.8 cross compiler to build a 4.8 "native" compiler.  So you
should build a 4.8 cross compiler which will include all the target libraries
and then you do a 4.8 Canadian cross (you just need to do "make all-host &&
make install-host" as you already have all the libraries done by the normal
cross).

[Bug other/55925] Unrecognized command line option '-mfxsr' when building x86_64-w64-mingw32 native compiler

[lailavrazda1979 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55925

lailavrazda1979 at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |

--- Comment #8 from lailavrazda1979 at gmail dot com 2013-01-14 23:43:54 UTC ---
Oh, okay. That makes sense. Thank you.

[Bug other/55925] Unrecognized command line option '-mfxsr' when building x86_64-w64-mingw32 native compiler

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55925

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> 2013-01-15 01:17:32 UTC ---
.