Re: Make -mno-shared the default for MIPS GNU/Linux

[David Daney <ddaney at avtrex dot com>]

Richard Sandiford wrote:
> In:
>
>     http://gcc.gnu.org/ml/gcc-patches/2006-03/msg01346.html
>
> one the changes I promised (threatened?) for 4.3 was to make -mno-shared
> the default for MIPS GNU/Linux if gcc is configured to use a version of
> binutils that supports -mno-shared.  See the link above for the rationale.
>
> The patch below does this.  Regression tested on mips64-linux-gnu
> (all three ABIs).  I also built a new cross sysroot with this patch,
> and it was that sysroot I used for the gcc regression tests.  Everything
> seemed to go well.  Applied to trunk.
>
> If you find any fallout from this patch, please do let me know.
>
> Richard
>
>
> gcc/
> 	* configure.ac (HAVE_AS_NO_SHARED): New AC_DEFINE.  Test for the
> 	-mno-shared assembler option on mips targets.
> 	* configure, config.in: Regenerate.
> 	* config/mips/linux.h (NO_SHARED_SPECS): New macro.
> 	(DRIVER_SELF_SPECS): Define to NO_SHARED_SPECS if non-empty.
> 	* config/mips/linux64.h (DRIVER_SELF_SPECS): Include NO_SHARED_SPECS.
>
>   
I am all for the patch, I have been compiling all my non-shared code 
with this option ever since we fixed the linker to make it possible.

However at least once a month I get bitten by the problem of putting 
code compiled with -mno-shared in a shared library and having it 
immediately SIGSEGV.  I should probably be more careful.  At least for 
the o32 ABI, supplying -fpic did not used to matter, I expect others to 
have problems as well.

David Daney