ENH: Improve linking to third-party shared libraries on soname platforms

  - 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

1 files changed, 9 insertions, 1 deletions

diff --git a/Source/cmOrderDirectories.cxx b/Source/cmOrderDirectories.cxx
index 7bc5dd6..a0ff9c1 100644
--- a/Source/cmOrderDirectories.cxx
+++ b/Source/cmOrderDirectories.cxx
@@ -119,6 +119,15 @@ public:
                                      const char* soname):
     cmOrderDirectoriesConstraint(od, file), SOName(soname? soname : "")
     {
+    if(this->SOName.empty())
+      {
+      // Try to guess the soname.
+      std::string soguess;
+      if(cmSystemTools::GuessLibrarySOName(file, soguess))
+        {
+        this->SOName = soguess;
+        }
+      }
     }
 
   virtual void Report(std::ostream& e)
@@ -164,7 +173,6 @@ bool cmOrderDirectoriesConstraintSOName::FindConflict(std::string const& dir)
     // Get the set of files that might conflict.  Since we do not
     // know the soname just look at all files that start with the
     // file name.  Usually the soname starts with the library name.
-    // TODO: Check if the library is a symlink and guess the soname.
     std::string base = this->FileName;
     std::set<cmStdString>::const_iterator first = files.lower_bound(base);
     ++base[base.size()-1];