Windows: Use response files to specify link libraries for GNU tools

Work around the command-line-length limit by using an @linklibs.rsp
response file to pass the flags for link libraries.  This allows
very long lists of libraries to be used in addition to the existing
support for passing object files via response file.

Suggested-by: Peter Keuschnigg <peter.keuschnigg@pmu.ac.at>

1 files changed, 13 insertions, 1 deletions

diff --git a/Source/cmMakefileLibraryTargetGenerator.cxx b/Source/cmMakefileLibraryTargetGenerator.cxx
index c639f3e..39e00b2 100644
--- a/Source/cmMakefileLibraryTargetGenerator.cxx
+++ b/Source/cmMakefileLibraryTargetGenerator.cxx
@@ -485,6 +485,18 @@ void cmMakefileLibraryTargetGenerator::WriteLibraryRules
     }
   }
 
+  // Select whether to use a response file for libraries.
+  bool useResponseFileForLibs = false;
+  {
+  std::string responseVar = "CMAKE_";
+  responseVar += linkLanguage;
+  responseVar += "_USE_RESPONSE_FILE_FOR_LIBRARIES";
+  if(this->Makefile->IsOn(responseVar.c_str()))
+    {
+    useResponseFileForLibs = true;
+    }
+  }
+
   // For static libraries there might be archiving rules.
   bool haveStaticLibraryRule = false;
   std::vector<std::string> archiveCreateCommands;
@@ -546,7 +558,7 @@ void cmMakefileLibraryTargetGenerator::WriteLibraryRules
   std::string linkLibs;
   if(this->Target->GetType() != cmTarget::STATIC_LIBRARY)
     {
-    this->CreateLinkLibs(linkLibs, relink, depends);
+    this->CreateLinkLibs(linkLibs, relink, useResponseFileForLibs, depends);
     }
 
   // Construct object file lists that may be needed to expand the