Hey David,
On Thu, 24 Dec 2009, Dr. David Kirkby wrote:
I'm helping on the Sage maths project
http://www.sagemath.org/
where there are a large number of packages built, most of which ignore
CFLAGS. (Quite a few ignore CC and CXX too!) I'd like to display all the
warnings, but its hard when people overwrite CFLAGS.
Is there a way I can build gcc such that effectively "-Wall" is enabled all
the time?
If not, could anyone point me to where in the source code I might be able to
hack it, to build a version which displays all the warnings?
I doubt that you can configure gcc to enable all warnings by default, but
I'm not 100% sure, but you could possibly use one of the following
possiblities to hack it into gcc:
1) For C/C++ code, the function 'c_common_handle_option' sets all the
single warnings covered/enabled by -Wall. For gcc-4.4.1, it's
c-opts.c:378. So, to always enable -Wall, you could call
c_common_handle_option (via the language hooks) in
decode_options after parsing of the command-line parameters is finished. I
didn't test it, but you should get the effect of -Wall by calling
c_common_handle_option(OPT_Wall, NULL, true);
2) As an alternative, you could change the gcc driver to always pass -Wall
to the compiler (cc1,cc1plus). For this, please check,
gcc.c:827 --> cc1_options
If I see it correctly, this should then work for C/C++ compilations.
I hope that is what you're searching for ...
Happy X-Mas,
- Andi -
