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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