Split GNU compiler information files

This moves GNU compiler flags into new-style modules

  Compiler/GNU-<lang>.cmake
  Platform/<os>-GNU-<lang>.cmake

We use language-independent helper modules

  Compiler/GNU.cmake
  Platform/<os>-GNU.cmake

to define macros consolidating the information.

4 files changed, 56 insertions, 3 deletions

diff --git a/Modules/Compiler/GNU-C.cmake b/Modules/Compiler/GNU-C.cmake
index abf384a..9a5137a 100644
--- a/Modules/Compiler/GNU-C.cmake
+++ b/Modules/Compiler/GNU-C.cmake
@@ -1 +1,2 @@
-SET(CMAKE_C_VERBOSE_FLAG "-v")
+include(Compiler/GNU)
+__compiler_gnu(C)
diff --git a/Modules/Compiler/GNU-CXX.cmake b/Modules/Compiler/GNU-CXX.cmake
index f3c6b5f..879ab8f 100644
--- a/Modules/Compiler/GNU-CXX.cmake
+++ b/Modules/Compiler/GNU-CXX.cmake
@@ -1 +1,2 @@
-SET(CMAKE_CXX_VERBOSE_FLAG "-v")
+include(Compiler/GNU)
+__compiler_gnu(CXX)
diff --git a/Modules/Compiler/GNU-Fortran.cmake b/Modules/Compiler/GNU-Fortran.cmake
index 7f7c128..6e0f5f3 100644
--- a/Modules/Compiler/GNU-Fortran.cmake
+++ b/Modules/Compiler/GNU-Fortran.cmake
@@ -1 +1,14 @@
-SET(CMAKE_Fortran_VERBOSE_FLAG "-v")
+include(Compiler/GNU)
+__compiler_gnu(Fortran)
+
+# No -DNDEBUG for Fortran.
+SET(CMAKE_Fortran_FLAGS_MINSIZEREL_INIT "-Os")
+SET(CMAKE_Fortran_FLAGS_RELEASE_INIT "-O3")
+
+# We require updates to CMake C++ code to support preprocessing rules
+# for Fortran.
+SET(CMAKE_Fortran_CREATE_PREPROCESSED_SOURCE)
+SET(CMAKE_Fortran_CREATE_ASSEMBLY_SOURCE)
+
+# Fortran-specific feature flags.
+SET(CMAKE_Fortran_MODDIR_FLAG -J)
diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake
new file mode 100644
index 0000000..63652b6
--- /dev/null
+++ b/Modules/Compiler/GNU.cmake
@@ -0,0 +1,38 @@
+
+#=============================================================================
+# Copyright 2002-2009 Kitware, Inc.
+#
+# 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.
+#=============================================================================
+# (To distributed this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+# This module is shared by multiple languages; use include blocker.
+if(__COMPILER_GNU)
+  return()
+endif()
+set(__COMPILER_GNU 1)
+
+macro(__compiler_gnu lang)
+  # Feature flags.
+  set(CMAKE_${lang}_VERBOSE_FLAG "-v")
+  set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC")
+  set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-shared")
+
+  # Initial configuration flags.
+  set(CMAKE_${lang}_FLAGS_INIT "")
+  set(CMAKE_${lang}_FLAGS_DEBUG_INIT "-g")
+  set(CMAKE_${lang}_FLAGS_MINSIZEREL_INIT "-Os -DNDEBUG")
+  set(CMAKE_${lang}_FLAGS_RELEASE_INIT "-O3 -DNDEBUG")
+  set(CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT "-O2 -g")
+  set(CMAKE_${lang}_CREATE_PREPROCESSED_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")
+  set(CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <FLAGS> -S <SOURCE> -o <ASSEMBLY_SOURCE>")
+  if(NOT APPLE)
+    set(CMAKE_INCLUDE_SYSTEM_FLAG_CXX "-isystem ")
+  endif(NOT APPLE)
+endmacro()