Allow a toolchain file to specify a generator toolset

Delay use of CMAKE_GENERATOR_TOOLSET until the CMakeSystem.cmake
file has been configured and loaded during the first project() or
enable_language() command.  This gives the toolchain file named by
CMAKE_TOOLCHAIN_FILE a chance to set CMAKE_GENERATOR_TOOLSET.  This
point is still early enough to set the generator toolset prior to
the initialization of any languages that might use the toolset.

The cmake::GeneratorToolset member variable remains an indication
of what was specified by the -T option or loaded from the cache.
It does not need to be updated based on the toolchain file setting.
The cmMakefile::TryCompile can still pass cmake::GeneratorToolset
into the inner instance because the try-compiled project will do
platform and language initialization using the CMakeSystem module
configured for the outer project.

Extend the RunCMake.GeneratorToolset test with cases that use a
toolchain file to set CMAKE_GENERATOR_TOOLSET.

1 files changed, 0 insertions, 5 deletions

diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index 9906c4b..16dc724 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -1462,11 +1462,6 @@ int cmake::ActualConfigure()
                                       "Name of generator toolset.",
                                       cmCacheManager::INTERNAL);
     }
-  if(!this->GeneratorToolset.empty() &&
-     !this->GlobalGenerator->SetGeneratorToolset(this->GeneratorToolset))
-    {
-    return -2;
-    }
 
   // reset any system configuration information, except for when we are
   // InTryCompile. With TryCompile the system info is taken from the parent's