ENH: determine typesize by compiling a file and reading strings from the compiled output.

Tested with various gcc, XCode, MSVC7, sdcc
For OSX when doing TRY_COMPILE() CMAKE_OSX_ARCHITECTURES is used, if there are different results an error is generated. CMAKE_OSX_ARCHITECTURES can be overwritten for the TRY_COMPILES with CMAKE_TRY_COMPILE_OSX_ARCHITECTURES.

Alex

1 files changed, 22 insertions, 5 deletions

diff --git a/Source/cmCoreTryCompile.cxx b/Source/cmCoreTryCompile.cxx
index ee4fe97..8abd690 100644
--- a/Source/cmCoreTryCompile.cxx
+++ b/Source/cmCoreTryCompile.cxx
@@ -225,13 +225,30 @@ int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv)
         }
       fprintf(fout, ")\n");
       }
-    const char* platformOptions = 
-      this->Makefile->GetDefinition("CMAKE_TRY_COMPILE_PLATFORM_OPTIONS");
-    if ( platformOptions )
+
+    /* for the TRY_COMPILEs we want to be able to specify the architecture.
+      So the user can set CMAKE_OSX_ARCHITECTURE to i386;ppc and then set 
+      CMAKE_TRY_COMPILE_OSX_ARCHITECTURE first to i386 and then to ppc to
+      have the tests run for each specific architecture. Since 
+      cmLocalGenerator doesn't allow building for "the other" 
+      architecture only via CMAKE_OSX_ARCHITECTURES,use to CMAKE_DO_TRY_COMPILE
+      to enforce it for this case here.
+      */
+    cmakeFlags.push_back("-DCMAKE_DO_TRY_COMPILE=TRUE");
+    if(this->Makefile->GetDefinition("CMAKE_TRY_COMPILE_OSX_ARCHITECTURES")!=0)
       {
-      fprintf(fout, "%s\n", platformOptions);
+      std::string flag="-DCMAKE_OSX_ARCHITECTURES=";
+      flag += this->Makefile->GetSafeDefinition(
+                                        "CMAKE_TRY_COMPILE_OSX_ARCHITECTURES");
+      cmakeFlags.push_back(flag);
       }
-    
+    else if (this->Makefile->GetDefinition("CMAKE_OSX_ARCHITECTURES")!=0)
+      {
+      std::string flag="-DCMAKE_OSX_ARCHITECTURES=";
+      flag += this->Makefile->GetSafeDefinition("CMAKE_OSX_ARCHITECTURES");
+      cmakeFlags.push_back(flag);
+      }
+
     fprintf(fout, "ADD_EXECUTABLE(cmTryCompileExec \"%s\")\n",source.c_str());
     fprintf(fout, 
             "TARGET_LINK_LIBRARIES(cmTryCompileExec ${LINK_LIBRARIES})\n");