[Bug target/57848] internal compiler error on builtin and '#pragma GCC target()' option

[dongsheng.song at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57848

--- Comment #10 from Dongsheng Song <dongsheng.song at gmail dot com> ---
If your compiler default target support sse4.2, then you can't reproduce it:

i686-w64-mingw32-gcc -march=corei7 pr57848.c

But when you use target which do not support sse4.2, then the internal compiler
error occurred:

$ i686-w64-mingw32-gcc -c -march=core2 pr57848.c
pr57848.c:2:9: internal compiler error: in c_builtin_function_ext_scope, at
c/c-decl.c:3633
 #pragma GCC target("sse4.2")
         ^
0x57024b c_builtin_function_ext_scope(tree_node*)
        /home/cauchy/vcs/svn/gcc/trunk/gcc/c/c-decl.c:3633
0x79f288 add_builtin_function_common
        /home/cauchy/vcs/svn/gcc/trunk/gcc/langhooks.c:561
0x79fb43 add_builtin_function_ext_scope(char const*, tree_node*, int,
built_in_class, char const*, tree_node*)
        /home/cauchy/vcs/svn/gcc/trunk/gcc/langhooks.c:597
0xa63224 ix86_add_new_builtins
        /home/cauchy/vcs/svn/gcc/trunk/gcc/config/i386/i386.c:27368
0xa63224 ix86_valid_target_attribute_tree(tree_node*)
        /home/cauchy/vcs/svn/gcc/trunk/gcc/config/i386/i386.c:4631
0x5f2000 ix86_pragma_target_parse
        /home/cauchy/vcs/svn/gcc/trunk/gcc/config/i386/i386-c.c:393
0x5e237d handle_pragma_target
        /home/cauchy/vcs/svn/gcc/trunk/gcc/c-family/c-pragma.c:805
0x59696e c_parser_pragma
        /home/cauchy/vcs/svn/gcc/trunk/gcc/c/c-parser.c:8972
0x5a4f5b c_parser_external_declaration
        /home/cauchy/vcs/svn/gcc/trunk/gcc/c/c-parser.c:1345
0x5a58c7 c_parser_translation_unit
        /home/cauchy/vcs/svn/gcc/trunk/gcc/c/c-parser.c:1251
0x5a58c7 c_parse_file()
        /home/cauchy/vcs/svn/gcc/trunk/gcc/c/c-parser.c:11223
0x5dfec4 c_common_parse_file()
        /home/cauchy/vcs/svn/gcc/trunk/gcc/c-family/c-opts.c:1046
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

i686-w64-mingw32-gcc -v
Using built-in specs.
COLLECT_GCC=i686-w64-mingw32-gcc
COLLECT_LTO_WRAPPER=/home/cauchy/cross/i686-windows-gcc49/libexec/gcc/i686-w64-mingw32/4.9.0/lto-wrapper
Target: i686-w64-mingw32
Configured with: /home/cauchy/vcs/svn/gcc/trunk/configure
--prefix=/home/cauchy/cross/i686-windows-gcc49
--with-sysroot=/home/cauchy/cross/i686-windows-gcc49
--build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu
--target=i686-w64-mingw32 --disable-multilib --disable-nls
--enable-checking=release --enable-languages=c,c++,fortran --with-arch=i686
--with-tune=generic
Thread model: win32
gcc version 4.9.0 20130902 (experimental) (GCC)