If FindMPI can't interrogate any of the available compilers, it attempts to compile simple MPI
programs with CMAKE_${lang}_COMPILER. If this works, it uses that as MPI_${lang}_COMPILER.
This allows MPI to be discovered on Cray XT/XE systems, where modules are used and cc, CC, and ftn
compilers *are* MPI compilers.
Users can now supply MPI_COMPILER, MPI_INCLUDE_PATH, MPI_LIBRARY,
and others as with the old FindMPI. These are mapped to their
respective equivalents for C and CXX. Fortran is not touched, as
there was no Fortran support in the old FindMPI.
Adjust whitespace to make the output of "--help-module FindMPI" look
good. Also separate the comment containing the copyright and license
notice so it does not appear in the documentation.
Adds support for:
- MPI_<lang>_COMPILER and other useful variables for C, CXX, Fortran
- Better compiler interrogation (handles mvapich)
- Supports specifying an MPI compiler name directly on the command line
without and absolute path, e.g.: cmake -D MPI_CXX_COMPILER=mpixlC
- Better compiler name searching tries to match MPI compiler to regular
CMAKE_<lang>_COMPILER_ID, if it's available.
Gets rid of:
- MPI_LIBRARY, MPI_EXTRA_LIBRARY cache variables. These and other old
vars are still exported for backward compatibility, but they're not
cached.
The FindPackageHandleStandardArgs module was originally created outside
of CMake. It was added for CMake 2.6.0 by commit e118a627 (add a macro
FIND_PACKAGE_HANDLE_STANDARD_ARGS..., 2007-07-18). However, it also
proliferated into a number of other projects that at the time required
only CMake 2.4 and thus could not depend on CMake to provide the module.
CMake's own find modules started using the module in commit b5f656e0
(use the new FIND_PACKAGE_HANDLE_STANDARD_ARGS in some of the FindXXX
modules..., 2007-07-18).
Then commit d358cf5c (add 2nd, more powerful mode to
find_package_handle_standard_args, 2010-07-29) added a new feature to
the interface of the module that was fully optional and backward
compatible with all existing users of the module. Later commit 5f183caa
(FindZLIB: use the FPHSA version mode, 2010-08-04) and others shortly
thereafter started using the new interface in CMake's own find modules.
This change was also backward compatible because it was only an
implementation detail within each module.
Unforutnately these changes introduced a problem for projects that still
have an old copy of FindPackageHandleStandardArgs in CMAKE_MODULE_PATH.
When any such project uses one of CMake's builtin find modules the line
include(FindPackageHandleStandardArgs)
loads the copy from the project which does not have the new interface!
Then the including find module tries to use the new interface with the
old module and fails.
Whether this breakage can be considered a backward incompatible change
in CMake is debatable. The situation is analagous to copying a standard
library header from one version of a compiler into a project and then
observing problems when the next version of the compiler reports errors
in its other headers that depend on its new version of the original
header. Nevertheless it is a change to CMake that causes problems for
projects that worked with previous versions.
This problem was discovered during the 2.8.3 release candidate cycle.
It is an instance of a more general problem with projects that provide
their own versions of CMake modules when other CMake modules depend on
them. At the time we resolved this instance of the problem with commit
b0118402 (Use absolute path to FindPackageHandleStandardArgs.cmake
everywhere, 2010-09-28) for the 2.8.3 release.
In order to address the more general problem we introduced policy
CMP0017 in commit db44848f (Prefer files from CMAKE_ROOT when including
from CMAKE_ROOT, 2010-11-17). That change was followed by commit
ce28737c (Remove usage of CMAKE_CURRENT_LIST_DIR now that we have
CMP0017, 2010-12-20) which reverted the original workaround in favor of
using the policy. However, existing project releases do not set the
policy behavior to NEW and therefore still exhibit the problem.
We introduced in commit a364daf1 (Allow users to specify defaults for
unset policies, 2011-01-03) an option for users to build existing
projects by adding -DCMAKE_POLICY_DEFAULT_CMP0017=NEW to the command
line. Unfortunately this solution still does not allow such projects to
build out of the box, and there is no good way to suggest the use of the
new option.
The only remaining solution to keep existing projects that exhibit this
problem building is to restore the change originally made in commit
b0118402 (Use absolute path to FindPackageHandleStandardArgs.cmake
everywhere, 2010-09-28). This also avoids policy CMP0017 warnings for
this particular instance of the problem the policy addresses.
This puts the new search behaviour for included files in action, i.e.
now when a file from Modules/ include()s another file, it also gets the
one from Modules/ included, i.e. the one it expects.
Alex
Parse compiler flags like "-fmessage-length=0 -fstack-protector
-funwind-tables -fasynchronous-unwind-tables -fno-strict-aliasing" from
the output of "mpicc -show". We already handle preprocessor definition
arguments like -DUSE_STDARG. Honor '-f' flags too.
Commit d84cbd0f (FindMPI: Parse mpicc flags more carefully, 2010-06-24)
broke parsing of '-L' flags appearing after '-Wl,' by expecting a
preceding space. Update the regular expression to allow '-Wl,-L' too.
Do not hard-code known BlueGene/L MPI libraries. We do not know their
location so the linker cannot find them without the proper -L search
path. The MPI compiler tells us about the libraries anyway, and if it
does not then the user can fix the problem locally by editing the
MPI_EXTRA_LIBRARY cache entry.
Extend the fix from commit 68c7d3e2 (FindMPI: Do not parse -l in middle
of library name, 2010-06-24). Parse -D, -I, -L, and -Wl only with
preceding spaces or at the beginning of the string.
We parse the output of 'mpicc -shome:link' to look for -l options
specifying libraries. Fix the parsing regex to avoid matching the
string '-l' in the middle of a library name.
This adds copyright/license notification blocks CMake's find-modules.
Many of the modules had no notices at all. Some had notices referring
to the BSD license already. This commit normalizes existing notices and
adds missing notices.
