cat 2.c
int 
main (int argc, char *argv[], char *envp[]) 
{
	return 0;
}


gcc -v 
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.6/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.6.3-1ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.6 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) 



gdb ./a.out 
GNU gdb (GDB) 7.5.50.20120721-cvs
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/teawater/tmp/a.out...done.
(gdb) b 3
Breakpoint 1 at 0x4004c3: file 2.c, line 3.
(gdb) r
Starting program: /home/teawater/tmp/a.out 
Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".c"
Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".c"
Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".c"
Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".c"
[Inferior 1 (process 11361) exited normally]
(gdb) quit





gcc-4.4 -v
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.4.7-1ubuntu2' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.4 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.4.7 (Ubuntu/Linaro 4.4.7-1ubuntu2) 

gcc-4.4 -g 2.c


gdb ./a.out 
GNU gdb (GDB) 7.5.50.20120721-cvs
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/teawater/tmp/a.out...done.
(gdb) b 3
Breakpoint 1 at 0x4004c3: file 2.c, line 3.
(gdb) r
Starting program: /home/teawater/tmp/a.out 
Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".c"
Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".c"
Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".c"
Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".c"
[Inferior 1 (process 11375) exited normally]