This adds implicit libraries and search directories for languages linked
into a target other than the linker language to its link line. For
example, when linking an executable containing both C++ and Fortran code
the C++ linker is used but we need to add the Fortran libraries.
The variables
CMAKE_<LANG>_IMPLICIT_LINK_LIBRARIES
CMAKE_<LANG>_IMPLICIT_LINK_DIRECTORIES
contain the implicit libraries and directories for each language.
Entries for the linker language are known to be implicit in the
generated link line. Entries for other languages that do not appear in
the known implicit set are listed explicitly at the end of the link
line.
This factors code out of cmOrderDirectories::CollectOriginalDirectories
into cmOrderDirectories::AddOriginalDirectories. Later a new call will
be added, and this is more readable anyway.
When computing runtime search path ordering a constraint exists when a
file that may be found by the runtime search exists in a directory other
than that containing the desired file. We test whether a potential
conflict is really the same due to a symlink. Recently the change to
cmFindLibraryCommand to load directory content created a case in which
the same-file check would be incorrectly skipped. This avoids skipping
the check.
We never explicitly specify system library directories in linker or
runtime search paths. Furthermore, libraries in these directories are
always linked by asking the linker to search for them. We need to
generate a warning when explicitly specified search directories contain
files that may hide the system libraries during the search.
- Reduce false positives in cases of unknown soname
- Make library extension regular expressions match only at end of string
- When linking to libraries in implicit dirs convert to the -l option
only if the file name is one that can be found by the linker
(ex. /usr/lib/libfoo.so.1 should be linked by full path)
- Add cmSystemTools::GuessLibrarySOName to guess the soname of a
library based on presence of a symlink
- In cmComputeLinkInformation try to guess an soname before assuming
that a third-party library is built without an soname
- In cmOrderDirectories guess the soname of shared libraries in cases
it is otherwise unknown
- Use linker search path -L.. -lfoo for lib w/out soname
when platform sets CMAKE_PLATFORM_USES_PATH_WHEN_NO_SONAME
- Rename cmOrderRuntimeDirectories to cmOrderDirectories
and generalize it for both soname constraints and link
library constraints
- Use cmOrderDirectories to order -L directories based
on all needed constraints
- Avoid processing implicit link directories
- For CMAKE_OLD_LINK_PATHS add constraints from libs
producing them to produce old ordering
Bill Hoffman
Brad King