Introduce add_compile_options command.

This command is similar to add_definitions, in that it affects
the compile options of all targets which follow it. The implementation
is similar to the implementation of the include_directories command,
in that it is based on populating a COMPILE_OPTIONS directory property
and using that to initialize the same property on targets.

Unlike the include_directories command however, the add_compile_options
command does not affect previously defined targets. That is, in
the following code, foo will not be compiled with -Wall, but bar
will be:

 add_library(foo ...)
 add_compile_options(-Wall)
 add_library(bar ...)

1 files changed, 28 insertions, 0 deletions

diff --git a/Source/cmAddCompileOptionsCommand.cxx b/Source/cmAddCompileOptionsCommand.cxx
new file mode 100644
index 0000000000..a6c3c005cf
--- /dev/null
+++ b/Source/cmAddCompileOptionsCommand.cxx
@@ -0,0 +1,28 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2013 Stephen Kelly <steveire@gmail.com>
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#include "cmAddCompileOptionsCommand.h"
+
+bool cmAddCompileOptionsCommand
+::InitialPass(std::vector<std::string> const& args, cmExecutionStatus &)
+{
+  if(args.size() < 1 )
+    {
+    return true;
+    }
+
+  for(std::vector<std::string>::const_iterator i = args.begin();
+      i != args.end(); ++i)
+    {
+    this->Makefile->AddCompileOption(i->c_str());
+    }
+  return true;
+}