ENH: Set version info for shared libs on OSX.

  - Map SOVERSION major.minor.patch to compatibility_version
  - Map VERSION major.minor.patch to current_version
  - See issue #4383.

1 files changed, 42 insertions, 0 deletions

diff --git a/Source/cmMakefileLibraryTargetGenerator.cxx b/Source/cmMakefileLibraryTargetGenerator.cxx
index a881391..03b9622 100644
--- a/Source/cmMakefileLibraryTargetGenerator.cxx
+++ b/Source/cmMakefileLibraryTargetGenerator.cxx
@@ -364,6 +364,14 @@ void cmMakefileLibraryTargetGenerator::WriteLibraryRules
   std::string linkFlags;
   this->LocalGenerator->AppendFlags(linkFlags, extraFlags);
 
+  // Add OSX version flags, if any.
+  if(this->Target->GetType() == cmTarget::SHARED_LIBRARY ||
+     this->Target->GetType() == cmTarget::MODULE_LIBRARY)
+    {
+    this->AppendOSXVerFlag(linkFlags, linkLanguage, "COMPATIBILITY", true);
+    this->AppendOSXVerFlag(linkFlags, linkLanguage, "CURRENT", false);
+    }
+
   // Construct the name of the library.
   std::string targetName;
   std::string targetNameSO;
@@ -905,3 +913,37 @@ void cmMakefileLibraryTargetGenerator::WriteLibraryRules
   this->CleanFiles.insert(this->CleanFiles.end(),
                           libCleanFiles.begin(),libCleanFiles.end());
 }
+
+//----------------------------------------------------------------------------
+void
+cmMakefileLibraryTargetGenerator
+::AppendOSXVerFlag(std::string& flags, const char* lang,
+                   const char* name, bool so)
+{
+  // Lookup the flag to specify the version.
+  std::string fvar = "CMAKE_";
+  fvar += lang;
+  fvar += "_OSX_";
+  fvar += name;
+  fvar += "_VERSION_FLAG";
+  const char* flag = this->Makefile->GetDefinition(fvar.c_str());
+
+  // Skip if no such flag.
+  if(!flag)
+    {
+    return;
+    }
+
+  // Lookup the target version information.
+  int major;
+  int minor;
+  int patch;
+  this->Target->GetTargetVersion(so, major, minor, patch);
+  if(major > 0 || minor > 0 || patch > 0)
+    {
+    // Append the flag since a non-zero version is specified.
+    cmOStringStream vflag;
+    vflag << flag << major << "." << minor << "." << patch;
+    this->LocalGenerator->AppendFlags(flags, vflag.str().c_str());
+    }
+}