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, 9 insertions, 1 deletions

diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index f1d0ac3..eb1e3b2 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -297,7 +297,7 @@ void cmTarget::DefineProperties(cmake *cm)
      "List of options to pass to the compiler.",
      "This property specifies the list of options specified "
      "so far for this property.  "
-     "This property exists on targets only.  "
+     "This property exists on directories and targets.  "
      "\n"
      "The target property values are used by the generators to set "
      "the options for the compiler.\n"
@@ -1611,6 +1611,14 @@ void cmTarget::SetMakefile(cmMakefile* mf)
     {
     this->InsertInclude(*it);
     }
+  const std::vector<cmValueWithOrigin> parentOptions =
+                              this->Makefile->GetCompileOptionsEntries();
+
+  for (std::vector<cmValueWithOrigin>::const_iterator it
+              = parentOptions.begin(); it != parentOptions.end(); ++it)
+    {
+    this->InsertCompileOption(*it);
+    }
 
   if(this->TargetTypeValue == cmTarget::SHARED_LIBRARY
       || this->TargetTypeValue == cmTarget::MODULE_LIBRARY)