Along the lines of adding the -pedantic option, I would like to add an
ability (probably at ./configure time) to specify additional compile
options. Since one of my platforms is a Mac, I would like to be able to
add -wno_long_double, as it keeps telling me that their size is
non-portable.
Thanks,
Jonathan Polley
On Monday, July 1, 2002, at 05:43 PM, Julian Foad wrote:
> I now have a practical solution for saving the compiler warnings: a
> wrapper script replacement for the compiler.
>
> rm config.cache # Otherwise it keeps the previous values of CC and CXX.
> GCCFLAGS="-Wall -pedantic -Wpointer-arith"
> CC="saveoutp gcc" CXX="saveoutp c++" CFLAGS="$GCCFLAGS"
> CXXFLAGS="$GCCFLAGS" ./configure
>
> where ~/bin/saveoutp contains:
>
> #!/bin/bash
>
> # Run a program, also capturing stderr to a file.
> #
> # Usage: saveoutp <program> <option>... <filename>
> #
> # Treat the argument list as a shell command. Run the command,
> displaying
> # stderr but also capturing it into a file named ".deps/<filename>.err"
> .
> # (Bug: the command's exit status is reduced to just true or false.)
>
> if [ -d .deps ] ; then
>
> # Make name of error file from last positional argument.
> ERRFILE=.deps/${!#}.err
>
> # Execute program; save stderr; display stderr; return true/false
> exit code.
> { $* 2> $ERRFILE && cat $ERRFILE >&2; } || { cat $ERRFILE >&2; false;
> }
>
> else
>
> $*
>
> fi
>
> This wrapper script is specific to Bash, but it would be possible to
> write one for any shell that can redirect stderr, or even write a
> compiled program.
>
> Then you will always have the last warnings available for each C file and
> can run (e.g.)
>
> cat src/*/.deps/*.err
>
> to see them.
>
>
> [
> My previous attempt was no good. I wrote:
>>
>> 2. Save the error output for each C file as (e.g.) ".deps/*.err". E.g.
>> in each Makefile.in:
> ...
>> + $(CXXCOMPILE) -Wp,-MD,.deps/$(*F).pp -c $< 2> .deps/$(*F).err
> ...
>
> But if the compilation fails, 'make' will quit before displaying the
> error output file. That's no good. It needs to be done within a single
> command. What I really need is one of these:
>
> gcc 2| tee file.err # No: stderr->pipe not available AFAIK,
> and exit status is lost.
> gcc 2> file.err 2> /dev/con # No: in Bash the first output file has
> nothing written to it.
> gcc 2>(tee file.err) # No, though Bash can _almost_ do this
> on _some_ systems.
> gcc 2> file.err || { cat file.err; false; } # This might just about
> work!
>
> ... but I don't know if I can get automake to put stuff like this in the
> generated make files.
> ]
>
>
> - Julian
>
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