From e33c6b3fa0c0bb4bc085a5ebc3299e4b2b184f39 Mon Sep 17 00:00:00 2001
From: Cliff Yapp <cliffyapp@gmail.com>
Date: Tue, 7 Feb 2012 20:31:30 -0500
Subject: [PATCH] Teach CheckC... modules to use a source file as well as
 directly supplied source code.

---
 Modules/CheckCSourceCompiles.cmake   |   13 ++++++++++---
 Modules/CheckCSourceRuns.cmake       |   13 ++++++++++---
 Modules/CheckCXXSourceCompiles.cmake |   13 ++++++++++---
 Modules/CheckCXXSourceRuns.cmake     |   13 ++++++++++---
 4 files changed, 40 insertions(+), 12 deletions(-)

diff --git a/Modules/CheckCSourceCompiles.cmake b/Modules/CheckCSourceCompiles.cmake
index d59fe55..2971726 100644
--- a/Modules/CheckCSourceCompiles.cmake
+++ b/Modules/CheckCSourceCompiles.cmake
@@ -10,6 +10,9 @@
 #  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
 #  CMAKE_REQUIRED_INCLUDES = list of include directories
 #  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
+#
+# <code> may be either the actual source code to be compiled
+# or the full path to a file containing the source code
 
 #=============================================================================
 # Copyright 2005-2009 Kitware, Inc.
@@ -51,13 +54,17 @@ MACRO(CHECK_C_SOURCE_COMPILES SOURCE VAR)
     ELSE(CMAKE_REQUIRED_INCLUDES)
       SET(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES)
     ENDIF(CMAKE_REQUIRED_INCLUDES)
-    FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c"
-      "${SOURCE}\n")
+    IF(EXISTS "${SOURCE}")
+      SET(CHECK_SRC "${SOURCE}")
+    ELSE(EXISTS "${SOURCE}")
+      FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c" "${SOURCE}\n")
+      SET(CHECK_SRC "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c")
+    ENDIF(EXISTS "${SOURCE}")
 
     MESSAGE(STATUS "Performing Test ${VAR}")
     TRY_COMPILE(${VAR}
       ${CMAKE_BINARY_DIR}
-      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c
+      ${CHECK_SRC}
       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
       "${CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES}"
diff --git a/Modules/CheckCSourceRuns.cmake b/Modules/CheckCSourceRuns.cmake
index 764c756..8ab48a2 100644
--- a/Modules/CheckCSourceRuns.cmake
+++ b/Modules/CheckCSourceRuns.cmake
@@ -10,6 +10,9 @@
 #  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
 #  CMAKE_REQUIRED_INCLUDES = list of include directories
 #  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
+#
+# <code> may be either the actual source code to be built and
+# run or the full path to a file containing the source code
 
 #=============================================================================
 # Copyright 2006-2009 Kitware, Inc.
@@ -40,13 +43,17 @@ MACRO(CHECK_C_SOURCE_RUNS SOURCE VAR)
     ELSE(CMAKE_REQUIRED_INCLUDES)
       SET(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES)
     ENDIF(CMAKE_REQUIRED_INCLUDES)
-    FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c"
-      "${SOURCE}\n")
+    IF(EXISTS "${SOURCE}")
+      SET(CHECK_SRC "${SOURCE}")
+    ELSE(EXISTS "${SOURCE}")
+      FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c" "${SOURCE}\n")
+      SET(CHECK_SRC "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c")
+    ENDIF(EXISTS "${SOURCE}")
 
     MESSAGE(STATUS "Performing Test ${VAR}")
     TRY_RUN(${VAR}_EXITCODE ${VAR}_COMPILED
       ${CMAKE_BINARY_DIR}
-      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c
+      ${CHECK_SRC}
       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
       -DCMAKE_SKIP_RPATH:BOOL=${CMAKE_SKIP_RPATH}
diff --git a/Modules/CheckCXXSourceCompiles.cmake b/Modules/CheckCXXSourceCompiles.cmake
index 0491b37..0a7545e 100644
--- a/Modules/CheckCXXSourceCompiles.cmake
+++ b/Modules/CheckCXXSourceCompiles.cmake
@@ -10,6 +10,9 @@
 #  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
 #  CMAKE_REQUIRED_INCLUDES = list of include directories
 #  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
+#
+# <code> may be either the actual source code to be compiled
+# or the full path to a file containing the source code
 
 #=============================================================================
 # Copyright 2005-2009 Kitware, Inc.
@@ -52,13 +55,17 @@ MACRO(CHECK_CXX_SOURCE_COMPILES SOURCE VAR)
     ELSE(CMAKE_REQUIRED_INCLUDES)
       SET(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES)
     ENDIF(CMAKE_REQUIRED_INCLUDES)
-    FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx"
-      "${SOURCE}\n")
+    IF(EXISTS "${SOURCE}")
+      SET(CHECK_SRC "${SOURCE}")
+    ELSE(EXISTS "${SOURCE}")
+      FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx" "${SOURCE}\n")
+      SET(CHECK_SRC "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx")
+    ENDIF(EXISTS "${SOURCE}")
 
     MESSAGE(STATUS "Performing Test ${VAR}")
     TRY_COMPILE(${VAR}
       ${CMAKE_BINARY_DIR}
-      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx
+      ${CHECK_SRC}
       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
       "${CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES}"
diff --git a/Modules/CheckCXXSourceRuns.cmake b/Modules/CheckCXXSourceRuns.cmake
index ace60d1..80b8a6a 100644
--- a/Modules/CheckCXXSourceRuns.cmake
+++ b/Modules/CheckCXXSourceRuns.cmake
@@ -10,6 +10,9 @@
 #  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
 #  CMAKE_REQUIRED_INCLUDES = list of include directories
 #  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
+#
+# <code> may be either the actual source code to be built and
+# run or the full path to a file containing the source code
 
 #=============================================================================
 # Copyright 2006-2009 Kitware, Inc.
@@ -40,13 +43,17 @@ MACRO(CHECK_CXX_SOURCE_RUNS SOURCE VAR)
     ELSE(CMAKE_REQUIRED_INCLUDES)
       SET(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES)
     ENDIF(CMAKE_REQUIRED_INCLUDES)
-    FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx"
-      "${SOURCE}\n")
+    IF(EXISTS "${SOURCE}")
+      SET(CHECK_SRC "${SOURCE}")
+    ELSE(EXISTS "${SOURCE}")
+      FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx" "${SOURCE}\n")
+      SET(CHECK_SRC "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx")
+    ENDIF(EXISTS "${SOURCE}")
 
     MESSAGE(STATUS "Performing Test ${VAR}")
     TRY_RUN(${VAR}_EXITCODE ${VAR}_COMPILED
       ${CMAKE_BINARY_DIR}
-      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx
+      ${CHECK_SRC}
       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
       -DCMAKE_SKIP_RPATH:BOOL=${CMAKE_SKIP_RPATH}
-- 
1.7.6