[Bug c++/57897] New: pragma

[Bug c++/57897] New: pragma

[dongsheng.song at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57897

            Bug ID: 57897
           Summary: pragma
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dongsheng.song at gmail dot com

Due to Bug 57848, I must build gcc 4.9 with '--with-arch=corei7', then the
cross compiler building success.

But when I use the cross compiler to build native compiler, it failed with:

x86_64-w64-mingw32-g++ -c   -g -O2 -DIN_GCC   -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wmissing-format-attribute -pedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings   -DHAVE_CONFIG_H -I. -I.
-I/home/cauchy/vcs/svn/gcc/trunk/gcc -I/home/cauchy/vcs/svn/gcc/trunk/gcc/.
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../include
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libcpp/include
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./gmp
-I/home/cauchy/vcs/svn/gcc/trunk/gmp
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./mpfr/src
-I/home/cauchy/vcs/svn/gcc/trunk/mpfr/src
-I/home/cauchy/vcs/svn/gcc/trunk/mpc/src 
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libdecnumber
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libdecnumber/bid -I../libdecnumber
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libbacktrace -DCLOOG_INT_GMP
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./cloog/include
-I/home/cauchy/vcs/svn/gcc/trunk/cloog/include
-I/home/cauchy/vcs/svn/gcc/trunk/cloog/include 
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./isl/include
-I/home/cauchy/vcs/svn/gcc/trunk/isl/include  -I. -I.
-I/home/cauchy/vcs/svn/gcc/trunk/gcc -I/home/cauchy/vcs/svn/gcc/trunk/gcc/.
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../include
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libcpp/include
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./gmp
-I/home/cauchy/vcs/svn/gcc/trunk/gmp
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./mpfr/src
-I/home/cauchy/vcs/svn/gcc/trunk/mpfr/src
-I/home/cauchy/vcs/svn/gcc/trunk/mpc/src 
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libdecnumber
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libdecnumber/bid -I../libdecnumber
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libbacktrace -DCLOOG_INT_GMP
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./cloog/include
-I/home/cauchy/vcs/svn/gcc/trunk/cloog/include
-I/home/cauchy/vcs/svn/gcc/trunk/cloog/include 
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./isl/include
-I/home/cauchy/vcs/svn/gcc/trunk/isl/include \
                /home/cauchy/vcs/svn/gcc/trunk/gcc/config/i386/host-mingw32.c
In file included from
/home/cauchy/cross/x86_64-windows-gcc49/lib/gcc/x86_64-w64-mingw32/4.9.0/include/x86intrin.h:39:0,
                 from
/home/cauchy/cross/x86_64-windows-gcc49/x86_64-w64-mingw32/include/winnt.h:1369,
                 from
/home/cauchy/cross/x86_64-windows-gcc49/x86_64-w64-mingw32/include/windef.h:139,
                 from
/home/cauchy/cross/x86_64-windows-gcc49/x86_64-w64-mingw32/include/windows.h:69,
                 from
/home/cauchy/vcs/svn/gcc/trunk/gcc/config/i386/host-mingw32.c:29:
/home/cauchy/cross/x86_64-windows-gcc49/lib/gcc/x86_64-w64-mingw32/4.9.0/include/ammintrin.h:35:27:
sorry, unimplemented: -mno-fentry isn't compatible with SEH
 #pragma GCC target("sse4a")
                           ^
make[2]: *** [host-mingw32.o] Error 1
make[2]: Leaving directory `/home/cauchy/obj/native/gcc-4.9-win64/gcc/gcc'
make[1]: *** [install-strip-gcc] Error 2
make[1]: Leaving directory `/home/cauchy/obj/native/gcc-4.9-win64/gcc'
make: *** [install-strip] Error 2

>From http://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html

-fasynchronous-unwind-tables
    Generate unwind table in DWARF 2 format, if supported by target machine. 

There maybe something wrong, why when I use SEH, the gcc build script use
'-fasynchronous-unwind-tables' ?

$ cat x.c
#pragma GCC target("sse4a")

$ x86_64-w64-mingw32-g++ -c -fasynchronous-unwind-tables x.c
x.c:1:27: sorry, unimplemented: -mno-fentry isn't compatible with SEH
 #pragma GCC target("sse4a")
                           ^
$ x86_64-w64-mingw32-g++ -v
Using built-in specs.
COLLECT_GCC=x86_64-w64-mingw32-g++
COLLECT_LTO_WRAPPER=/home/cauchy/cross/x86_64-windows-gcc48/libexec/gcc/x86_64-w64-mingw32/4.8.2/lto-wrapper
Target: x86_64-w64-mingw32
Configured with: /home/cauchy/vcs/svn/gcc/branches/gcc-4_8-branch/configure
--prefix=/home/cauchy/cross/x86_64-windows-gcc48
--with-sysroot=/home/cauchy/cross/x86_64-windows-gcc48
--build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu
--target=x86_64-w64-mingw32 --disable-multilib --disable-nls
--enable-checking=release --enable-languages=c,c++,fortran --with-arch=core2
--with-tune=generic
Thread model: win32
gcc version 4.8.2 20130712 (prerelease) (GCC)

[Bug c++/57897] Target x86_64-w64-mingw32 failed with '-mno-fentry isn't compatible with SEH'

[dongsheng.song at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57897

--- Comment #1 from Dongsheng Song <dongsheng.song at gmail dot com> ---
$ ~/cross/x86_64-windows-gcc49/bin/x86_64-w64-mingw32-g++ -v
Using built-in specs.
COLLECT_GCC=/home/cauchy/cross/x86_64-windows-gcc49/bin/x86_64-w64-mingw32-g++
COLLECT_LTO_WRAPPER=/home/cauchy/cross/x86_64-windows-gcc49/libexec/gcc/x86_64-w64-mingw32/4.9.0/lto-wrapper
Target: x86_64-w64-mingw32
Configured with: /home/cauchy/vcs/svn/gcc/trunk/configure
--prefix=/home/cauchy/cross/x86_64-windows-gcc49
--with-sysroot=/home/cauchy/cross/x86_64-windows-gcc49
--build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu
--target=x86_64-w64-mingw32 --disable-multilib --disable-nls
--enable-checking=release --enable-languages=c,c++,fortran --with-arch=corei7
--with-tune=generic
Thread model: win32
gcc version 4.9.0 20130714 (experimental) (GCC)

$ cat x.c
#pragma GCC target("sse4a")

$ ~/cross/x86_64-windows-gcc49/bin/x86_64-w64-mingw32-g++ -c
-fasynchronous-unwind-tables x.c
x.c:1:27: sorry, unimplemented: -mno-fentry isn't compatible with SEH
 #pragma GCC target("sse4a")
                           ^

[Bug c++/57897] Target x86_64-w64-mingw32 failed with '-mno-fentry isn't compatible with SEH'

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57897

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ktietz at gcc dot gnu.org

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Kai, can you have a look?

[Bug c++/57897] Target x86_64-w64-mingw32 failed with '-mno-fentry isn't compatible with SEH'

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57897

--- Comment #3 from Kai Tietz <ktietz at gcc dot gnu.org> ---
Hmm, what I don't get is why there is a warning about -mno-fentry.  So I would
assume there is something else broken.
Nevertheless this reminds me about  pr/57848.  This issue seems to be in
general no mingw specific problem, but more an inconsistency about sse and
builtins.

[Bug c++/57897] Target x86_64-w64-mingw32 failed with '-mno-fentry isn't compatible with SEH'

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57897

Kai Tietz <ktietz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-12-06
     Ever confirmed|0                           |1

--- Comment #7 from Kai Tietz <ktietz at gcc dot gnu.org> ---
Issue is that for SEH-target we need to generate dw2 unwind-information so that
-fasynchronous-unwind-tables works proper.

Following patch should fix that:

Index: i386.c
===================================================================
--- i386.c      (Revision 205719)
+++ i386.c      (Arbeitskopie)
@@ -3698,6 +3698,9 @@ ix86_option_override_internal (bool main_args_p,
     {
       if (opts->x_optimize >= 1 && !opts_set->x_flag_omit_frame_pointer)
        opts->x_flag_omit_frame_pointer = !USE_X86_64_FRAME_POINTER;
+      if (opts->x_flag_asynchronous_unwind_tables == 1
+         && TARGET_SEH)
+       opts->x_flag_unwind_tables = 1;
       if (opts->x_flag_asynchronous_unwind_tables == 2)
        opts->x_flag_unwind_tables
          = opts->x_flag_asynchronous_unwind_tables = 1;

[Bug c++/57897] Target x86_64-w64-mingw32 failed with '-mno-fentry isn't compatible with SEH'

[dongsheng.song at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57897

--- Comment #8 from Dongsheng Song <dongsheng.song at gmail dot com> ---
It's hard to understand SEH reqiure unwind table in DWARF 2 format. can you
give me a brief description ?

Your patch does not help:

$ cat << EOF |  ./x86_64-windows-gcc49/bin/x86_64-w64-mingw32-g++ -O2 -o
`mktemp` -c -x c++ -fasynchronous-unwind-tables - >/dev/null
> #pragma GCC target("sse4a")
> EOF
<stdin>:1:27: sorry, unimplemented: -mno-fentry isn't compatible with SEH

$ ./x86_64-windows-gcc49/bin/x86_64-w64-mingw32-g++ -v
Using built-in specs.
COLLECT_GCC=./x86_64-windows-gcc49/bin/x86_64-w64-mingw32-g++
COLLECT_LTO_WRAPPER=/home/cauchy/cross/x86_64-windows-gcc49/libexec/gcc/x86_64-w64-mingw32/4.9.0/lto-wrapper
Target: x86_64-w64-mingw32
Configured with: /home/cauchy/vcs/svn/gcc/trunk/configure
--prefix=/home/cauchy/cross/x86_64-windows-gcc49
--with-sysroot=/home/cauchy/cross/x86_64-windows-gcc49
--build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu
--target=x86_64-w64-mingw32 --disable-multilib --disable-nls
--enable-checking=release --enable-languages=c,c++,fortran --with-arch=core2
--with-tune=generic
Thread model: win32
gcc version 4.9.0 20131206 (experimental) (GCC)

Build the gcc 4.9 x64 native compiler from the gcc 4.9 cross compiler still
failed:

x86_64-w64-mingw32-g++ -c   -g -O2 -DIN_GCC    -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wmissing-format-attribute -pedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings   -DHAVE_CONFIG_H -I. -I.
-I/home/cauchy/vcs/svn/gcc/trunk/gcc -I/home/cauchy/vcs/svn/gcc/trunk/gcc/.
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../include
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libcpp/include
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./gmp
-I/home/cauchy/vcs/svn/gcc/trunk/gmp
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./mpfr/src
-I/home/cauchy/vcs/svn/gcc/trunk/mpfr/src
-I/home/cauchy/vcs/svn/gcc/trunk/mpc/src 
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libdecnumber
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libdecnumber/bid -I../libdecnumber
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libbacktrace -DCLOOG_INT_GMP
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./cloog/include
-I/home/cauchy/vcs/svn/gcc/trunk/cloog/include
-I/home/cauchy/vcs/svn/gcc/trunk/cloog/include 
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./isl/include
-I/home/cauchy/vcs/svn/gcc/trunk/isl/include  -I. -I.
-I/home/cauchy/vcs/svn/gcc/trunk/gcc -I/home/cauchy/vcs/svn/gcc/trunk/gcc/.
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../include
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libcpp/include
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./gmp
-I/home/cauchy/vcs/svn/gcc/trunk/gmp
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./mpfr/src
-I/home/cauchy/vcs/svn/gcc/trunk/mpfr/src
-I/home/cauchy/vcs/svn/gcc/trunk/mpc/src 
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libdecnumber
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libdecnumber/bid -I../libdecnumber
-I/home/cauchy/vcs/svn/gcc/trunk/gcc/../libbacktrace -DCLOOG_INT_GMP
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./cloog/include
-I/home/cauchy/vcs/svn/gcc/trunk/cloog/include
-I/home/cauchy/vcs/svn/gcc/trunk/cloog/include 
-I/home/cauchy/obj/native/gcc-4.9-win64/gcc/./isl/include
-I/home/cauchy/vcs/svn/gcc/trunk/isl/include \
                /home/cauchy/vcs/svn/gcc/trunk/gcc/config/i386/host-mingw32.c
In file included from
/home/cauchy/cross/x86_64-windows-gcc49/lib/gcc/x86_64-w64-mingw32/4.9.0/include/x86intrin.h:27:0,
                 from
/home/cauchy/cross/x86_64-windows-gcc49/x86_64-w64-mingw32/include/winnt.h:1495,
                 from
/home/cauchy/cross/x86_64-windows-gcc49/x86_64-w64-mingw32/include/minwindef.h:146,
                 from
/home/cauchy/cross/x86_64-windows-gcc49/x86_64-w64-mingw32/include/windef.h:8,
                 from
/home/cauchy/cross/x86_64-windows-gcc49/x86_64-w64-mingw32/include/windows.h:69,
                 from
/home/cauchy/vcs/svn/gcc/trunk/gcc/config/i386/host-mingw32.c:29:
/home/cauchy/cross/x86_64-windows-gcc49/lib/gcc/x86_64-w64-mingw32/4.9.0/include/ia32intrin.h:54:28:
sorry, unimplemented: -mno-fentry isn't compatible with SEH
 #pragma GCC target("sse4.2")
                            ^
make[2]: *** [host-mingw32.o] Error 1
make[2]: Leaving directory `/home/cauchy/obj/native/gcc-4.9-win64/gcc/gcc'
make[1]: *** [install-strip-gcc] Error 2
make[1]: Leaving directory `/home/cauchy/obj/native/gcc-4.9-win64/gcc'
make: *** [install-strip] Error 2

$ svn info mingw-w64/trunk/ gcc/trunk/
Path: mingw-w64/trunk
URL: svn://svn.code.sf.net/p/mingw-w64/code/trunk
Repository Root: svn://svn.code.sf.net/p/mingw-w64/code
Repository UUID: 4407c894-4637-0410-b4f5-ada5f102cad1
Revision: 6392
Node Kind: directory
Schedule: normal
Last Changed Author: ktietz70
Last Changed Rev: 6392
Last Changed Date: 2013-12-05 18:06:07 +0800 (Thu, 05 Dec 2013)

Path: gcc/trunk
URL: svn://gcc.gnu.org/svn/gcc/trunk
Repository Root: svn://gcc.gnu.org/svn/gcc
Repository UUID: 138bc75d-0d04-0410-961f-82ee72b054a4
Revision: 205727
Node Kind: directory
Schedule: normal
Last Changed Author: jbglaw
Last Changed Rev: 205727
Last Changed Date: 2013-12-06 12:34:34 +0800 (Fri, 06 Dec 2013)

[Bug c++/57897] Target x86_64-w64-mingw32 failed with '-mno-fentry isn't compatible with SEH'

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57897

--- Comment #9 from Kai Tietz <ktietz at gcc dot gnu.org> ---
Issue is related to option -fasynchronous-unwind-tables option.  Better said to
option -fasynchronous-unwind-tables without -funwind-tables.

Following sample can demonstrate issue pretty well:

'#include <intrin.h>
 int a;'

By compiling test by '$ x86_64-w64-mingw32-gcc -S -o t.s t_xmmintrin.c -O2
-fasynchronous-unwind-tables' I can reproduce the fentry message.
By removing option -fasynchronous-unwind-tables, or adding -funwind-tables
option message won't be displayed.

By following patch for me the issue is solved:

Index: i386.c
===================================================================
--- i386.c      (Revision 205859)
+++ i386.c      (Arbeitskopie)
@@ -3698,6 +3698,10 @@
     {
       if (opts->x_optimize >= 1 && !opts_set->x_flag_omit_frame_pointer)
        opts->x_flag_omit_frame_pointer = !USE_X86_64_FRAME_POINTER;
+      if (opts->x_flag_asynchronous_unwind_tables
+         && !opts_set->x_flag_unwind_tables
+         && TARGET_64BIT_MS_ABI)
+       opts->x_flag_unwind_tables = 1;
       if (opts->x_flag_asynchronous_unwind_tables == 2)
        opts->x_flag_unwind_tables
          = opts->x_flag_asynchronous_unwind_tables = 1;

I will apply this patch to trunk soon, if there are no objections.

[Bug c++/57897] Target x86_64-w64-mingw32 failed with '-mno-fentry isn't compatible with SEH'

[rainer@emrich-ebersheim.de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57897

--- Comment #10 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
Am 12.12.2013 23:08, schrieb ktietz at gcc dot gnu.org:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57897
> 
> --- Comment #9 from Kai Tietz <ktietz at gcc dot gnu.org> --- By following
> patch for me the issue is solved:
> 
> Index: i386.c 
> =================================================================== ---
> i386.c      (Revision 205859) +++ i386.c      (Arbeitskopie) @@ -3698,6
> +3698,10 @@ { if (opts->x_optimize >= 1 &&
> !opts_set->x_flag_omit_frame_pointer) opts->x_flag_omit_frame_pointer =
> !USE_X86_64_FRAME_POINTER; +      if
> (opts->x_flag_asynchronous_unwind_tables +         &&
> !opts_set->x_flag_unwind_tables +         && TARGET_64BIT_MS_ABI) +
> opts->x_flag_unwind_tables = 1; if (opts->x_flag_asynchronous_unwind_tables
> == 2) opts->x_flag_unwind_tables = opts->x_flag_asynchronous_unwind_tables
> = 1;
> 
> I will apply this patch to trunk soon, if there are no objections.
> 
I confirm, this solves the issue!

[Bug c++/57897] Target x86_64-w64-mingw32 failed with '-mno-fentry isn't compatible with SEH'

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57897

Kai Tietz <ktietz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #12 from Kai Tietz <ktietz at gcc dot gnu.org> ---
Fixed