Hi Bill:
I am going to change the subject line since this is now morphed into
a different topic.
On 2008-09-22 20:12-0400 Bill Hoffman wrote:
I am thinking if you have the enable_language BEFORE the project command it
will get around the bug, and work as you want it to.
That doesn't work quite like expected so it cannot be used for a workaround,
but variations on that theme give interesting results that may allow you to
figure the bug out.
If the CMakeLists.txt file contains just
ENABLE_LANGUAGE(C)
PROJECT(free_eos CXX)
then
[EMAIL PROTECTED]> grep '^CMAKE_C.*FLAGS_DEBUG' CMakeCache.txt |grep -v INTERNAL
CMAKE_CXX_FLAGS_DEBUG:STRING=
CMAKE_C_FLAGS_DEBUG:STRING=-g
i.e., ENABLE_LANGUAGE does work if used before PROJECT as you conjectured,
but then the result from PROJECT is screwed up which is a new (but
disappointing) result that makes this pattern unsuitable for a workaround, but
which may lead you to the source of this error.
Other variations of interest.
(1)
PROJECT(free_eos NONE)
ENABLE_LANGUAGE(C)
ENABLE_LANGUAGE(CXX)
==>
CMAKE_CXX_FLAGS_DEBUG:STRING=
CMAKE_C_FLAGS_DEBUG:STRING=
i.e., ENABLE_LANGUAGE never works properly for any language if done
after PROJECT.
(2)
ENABLE_LANGUAGE(C)
ENABLE_LANGUAGE(CXX)
PROJECT(free_eos NONE)
==>
CMAKE_CXX_FLAGS_DEBUG:STRING=
CMAKE_C_FLAGS_DEBUG:STRING=-g
(3)
ENABLE_LANGUAGE(CXX)
ENABLE_LANGUAGE(C)
PROJECT(free_eos NONE)
==>
CMAKE_CXX_FLAGS_DEBUG:STRING=-g
CMAKE_C_FLAGS_DEBUG:STRING=
i.e, from result (2) and (3) if ENABLE_LANGUAGE commands are specified
before PROJECT, the first one works but not subsequent ones which also makes
this pattern unsuitable as a possible workaround.
(4)
PROJECT(free_eos C CXX)
==>
CMAKE_CXX_FLAGS_DEBUG:STRING=-g
CMAKE_C_FLAGS_DEBUG:STRING=-g
i.e., the only pattern that gives the correct result is one that does not
use ENABLE_LANGUAGE.
I did all the above tests with 2.6.0, but previously I have shown the CVS
version of CMake had similar problems.
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 libLASi project (unifont.org/lasi); 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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