[CMake] Regression between 2.4.8 and 2.6.2 for the macada version of the gcc compiler

Thu Jan 29 12:56:41 EST 2009

This thread has included different questions for the macada gcc user that
have been brought up in various posts.  I will try to pass on all his
responses which he finally completed this morning.

Brad:

> What is the output of macada gcc with this command line:

> gcc -E -dM -x c /dev/null

See attached gcc_E_dM_x.out file.

Martin: [what is linker associated with macada compiler as revealed by gcc
-Wl,-v ?]

See attached gcc_Wl_v.out file.

Martin:

> I suspect the ada/gcc compiler calls ld directly without passing through
> /usr/bin/libtool. If this is true, changing "-current_version" to
> "-dylib_current_version" should solve the problem.

In Darwin.cmake, this user changed

SET(CMAKE_C_OSX_CURRENT_VERSION_FLAG -Wl,-current_version,)
to
SET(CMAKE_C_OSX_CURRENT_VERSION_FLAG -Wl,-dylib_current_version,)

and got 2.6.2 build success with the simple example.

He then went on to try and build PLplot, but ran into

/usr/bin/ld: unknown flag: -compatibility_version
collect2: ld returned 1 exit status

Darwin.cmake sets

SET(CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG -Wl,-compatibility_version,)
SET(CMAKE_CXX_OSX_COMPATIBILITY_VERSION_FLAG "${CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG}")

but I cannot figure out how (and in what context) these variables are used,
and the macada user has currently not provided further details of the above
error.  (If necessary, I could get the context from him, and set up a simple
test to illustrate the problem, but it appears Brad foretold that
compatibility version would be an issue as well so a special test may not
be necessary to investigate this error any further.)

This user then changed Darwin.cmake following Brad's compatibility version
workaround advice:

SET(CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG)
SET(CMAKE_CXX_OSX_COMPATIBILITY_VERSION_FLAG)

and PLplot built using CMake-2.6.2 without any further problems!

My thanks to Brad and Martin for helping this user get this far.

Brad, do you now have enough information to permanently fix the
-current_version and -compatibility_version issues for macada gcc for the
forthcoming 2.6.3 release or do you need more information from this user?
Also, if there is some patched version of Darwin.cmake you would like him to
try, I would be happy to pass it on to him.

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).
__________________________

Linux-powered Science
__________________________
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