Can I build gcc so -Wall option is always on ?

[Dr. David Kirkby]

Ralf Wildenhues wrote:
> Hello David,
> 
> * Dr. David Kirkby wrote on Thu, Dec 24, 2009 at 05:38:23PM CET:
>> 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?
> 
> I hate to be stating the obvious, but why not use a wrapper script?
> 
> mv gcc gcc.real
> cat >gcc <<\EOF
> #! /bin/sh
> exec gcc.real -Wall "$@"
> EOF
> 
> or just put one early in your $PATH.  Depending on your needs, it might
> have to be a bit more complex (put -Wall at the end if you care about
> overriding -Wno-all and some other flags, for example; or only add -Wall
> if -c is also seen, or similarly).
> 
> Cheers,
> Ralf
> 
I've tried this, and it works in 90% of cases, but not all. 'sqlite' is once 
such package which always gives errors if I try to build like this. The errors 
are like "no newline" or something like that. So I stuck a new line in, but it 
still does not work.

Here's one such error, where

make[2]: Entering directory 
`/export/home/drkirkby/sage-4.3.1.alpha1/spkg/build/sqlite-3.6.19.p0/src'
if /bin/sh ./libtool --tag=CC --mode=compile gcc -DPACKAGE_NAME=\"sqlite\" 
-DPACKAGE_TARNAME=\"sqlite\" -DPACKAGE_VERSION=\"3.6.19\" 
-DPACKAGE_STRING=\"sqlite\ 3.6.19\" 
-DPACKAGE_BUGREPORT=\"http://www.sqlite.org\" -DPACKAGE=\"sqlite\" 
-DVERSION=\"3.6.19\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 
-DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 
-DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 
-DHAVE_FDATASYNC=1 -DHAVE_USLEEP=1 -DHAVE_LOCALTIME_R=1 -DHAVE_GMTIME_R=1 
-DHAVE_READLINE=1 -I. -I.   -I 
/export/home/drkirkby/sage-4.3.1.alpha1/local/include -DSQLITE_THREADSAFE=1 
-Wall -g -m64 -m64  -g  -O2  -MT sqlite3.lo -MD -MP -MF ".deps/sqlite3.Tpo" -c 
-o sqlite3.lo sqlite3.c; \
	then mv -f ".deps/sqlite3.Tpo" ".deps/sqlite3.Plo"; else rm -f 
".deps/sqlite3.Tpo"; exit 1; fi
mkdir .libs
  gcc "-DPACKAGE_NAME=\"sqlite\"" "-DPACKAGE_TARNAME=\"sqlite\"" 
"-DPACKAGE_VERSION=\"3.6.19\"" "-DPACKAGE_STRING=\"sqlite 3.6.19\"" 
"-DPACKAGE_BUGREPORT=\"http://www.sqlite.org\"" "-DPACKAGE=\"sqlite\"" 
"-DVERSION=\"3.6.19\"" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 
-DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 
-DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 
-DHAVE_FDATASYNC=1 -DHAVE_USLEEP=1 -DHAVE_LOCALTIME_R=1 -DHAVE_GMTIME_R=1 
-DHAVE_READLINE=1 -I. -I. -I 
/export/home/drkirkby/sage-4.3.1.alpha1/local/include -DSQLITE_THREADSAFE=1 
-Wall -g -m64 -m64 -g -O2 -MT sqlite3.lo -MD -MP -MF .deps/sqlite3.Tpo -c 
sqlite3.c  -fPIC -DPIC -o .libs/sqlite3.o
gcc: 3.6.19": No such file or directory
make[2]: *** [sqlite3.lo] Error 1
make[2]: Leaving directory 
`/export/home/drkirkby/sage-4.3.1.alpha1/spkg/build/sqlite-3.6.19.p0/src'
Error making sqlite

(The two -m64's are a result of it being added elsewhere too, but generally I've 
not found a wrapper suitable.)

Dave