[cmake-developers] Adding TIMEOUT to execute_process() in CMAKE_DETERMINE_COMPILER_ID_VENDOR() ?
Alexander Neundorf
neundorf at kde.org
Sun Aug 15 11:43:17 EDT 2010
Hi,
in CMAKE_DETERMINE_COMPILER_ID_VENDOR() the compiler is executed, and one
after the other a list of command line arguments is tested to see whether any
of them makes the compiler produce output where the compiler ID can be
recognized.
Now I think there is an issue with the execute_process() call.
E.g. for gas, the GNU assembler, a good option to do this is "gas --version",
which prints "GNU assembler ....".
Now for nasm, the Netwide assembler, a good option would be "nasm -v", which
gives "NASM version 0.98.39 compiled on Feb 6 2006" here.
So far so good, but, when I add "-v" to the list of options to try, the
function will try each compiler (where it hasn't found the ID yet) with
the "-v" option.
When I do this with as, it just sits there and waits forever, which would make
cmake wait forever I think.
Checking that each of the listed options doesn't make any possible compiler
hang is IMO not really possible.
So should a TIMEOUT be added to the execute_process() ?
Maybe something like 30 seconds ?
Alex
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