GCC process not working as expected when called in Python (3.1.2) subprocess-shell, but OK otherwise
kingsley.turner at openfieldcommunications.com
Thu Oct 14 04:06:54 CEST 2010
I'm using GCC as a pre-processor for a C-like language (EDDL) to handle all
the includes, macros, etc. producing a single source file for another
compiler. My python code massages the inputs (which arrive in a .zip file),
then calls GCC.
I have a problem where if I call GCC from my python script some of the
#defines are not processed in the output. However if I paste the exact same
GCC command-line into a shell, I get a correct output.
I'm calling GCC in this manner:
### Execute GCC, keep stdout & stderr
err_out = open(error_filename,"wb")
process = subprocess.Popen(gcc_command, stderr=err_out, bufsize=81920,
gcc_exit_code = process.wait()
log("GCC Exit Code %u" % (gcc_exit_code))
where gcc_command is:
"/usr/bin/gcc -I /tmp/dd-compile_1286930109.99 -I
/home/foo/eddl-includes -D__TOKVER__=600 -ansi -nostdinc -v -x c -E -o
So when this code spawns GCC, the compiler does not really work 100%, but if
I paste this exact command line, the output is perfect.
I'm not really sure how to debug this. I already checked the ulimits, and
permissions shouldn't be a problem since it's all run by the same user, I
also checked the environment - these were copied into the subshell.
GCC produces no warnings, or errors. The output is mostly OK, some other
macros have been processed.
If I diff the working output with the non-working one, the differences are
only a bunch of skipped #defines.
gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5)
Python 3.1.2 (release31-maint, Sep 17 2010, 20:27:33)
Linux 2.6.35-22-generic #34-Ubuntu SMP Sun Oct 10 09:26:05 UTC 2010 x86_64
Any suggestions for helping me debug this would be much appreciated.
PS> this query has also been posted to the GCC-help list
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