On 2007-04-01 13:59-0700 Alan W. Irwin wrote:
I have found two bugs in compiler flag support for Linux that I would like
to discuss here before making formal bug reports.
1. A general compiler flag bug with ENABLE_LANGUAGE.
The combination
PROJECT(free_eos CXX)
ENABLE_LANGUAGE(C)
defines the correct CXX flags, but blanks the C flags in the cache rather
than defining them properly[...]
With these compile flags blanked, it turns, e.g., CMAKE_BUILD_TYPE=Debug
into a no-op for the C language.
If I try, instead
PROJECT(free_eos C)
ENABLE_LANGUAGE(CXX)
then the C flags are defined correctly, but the CXX flags are blanked
turning, e.g., CMAKE_BUILD_TYPE=Debug into a no-op for the C++ language.
I don't know a fix for this bug in ENABLE_LANGUAGE for Linux, and the only
workaround is never to use it, and always specify required languages with
the PROJECT command (which is awkward if you want to have language support
at the user's option).
Since there was no discussion of this bug here, I assume it has not been
fixed in CVS and is instead a new discovery so it is now bug 4772.
#######Bug in Fortran flags.
Even if I use
PROJECT(free_eos Fortran)
to avoid the first general compiler flag bug, then the
cached Fortran flags I get with Linux/g77 for 2.4.6 are all blanked [....]
which _always_ turns, e.g., CMAKE_BUILD_TYPE=Debug into a no-op for g77 on
Linux.
A fix for this bug is to put the following lines at the end of
Platform/gcc.cmake:
# Treat g77 the same as gcc and g++
INCLUDE(Platform/g77)
N.B. ENABLE_LANGUAGE is broken for Fortran just as it is for C and C++ (see
bug 4772 above) so you must work around that issue by specifying Fortran in
the PROJECT command before the above two-line fix will work.
Since there was no discussion of this bug here, I assume it has not been
fixed in CVS and is instead a new discovery so it is now bug 4773.
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the Yorick front-end to PLplot (yplot.sf.net); the
Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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Linux-powered Science
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