From bbd0beb2234623cb6c3eed1215f41713b2609ace Mon Sep 17 00:00:00 2001
From: Bill Hoffman <bill.hoffman@kitware.com>
Date: Thu, 3 Aug 2006 15:20:48 -0400
Subject: [PATCH] ENH: add a try run source code macro

---
 Modules/CheckCXXSourceRuns.cmake | 67 ++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 Modules/CheckCXXSourceRuns.cmake

diff --git a/Modules/CheckCXXSourceRuns.cmake b/Modules/CheckCXXSourceRuns.cmake
new file mode 100644
index 000000000..8cb05f0e3
--- /dev/null
+++ b/Modules/CheckCXXSourceRuns.cmake
@@ -0,0 +1,67 @@
+# - Check if the source code provided in the SOURCE argument compiles and runs.# CHECK_CXX_SOURCE_RUNS(SOURCE VAR)
+# - macro which checks if the source code compiles\
+#  SOURCE - source code to try to compile
+#  VAR    - variable to store size if the type exists.
+#
+# The following variables may be set before calling this macro to
+# modify the way the check is run:
+#
+#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#  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
+
+MACRO(CHECK_CXX_SOURCE_RUNS SOURCE VAR)
+  IF("${VAR}" MATCHES "^${VAR}$")
+    SET(MACRO_CHECK_FUNCTION_DEFINITIONS 
+      "-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
+    IF(CMAKE_REQUIRED_LIBRARIES)
+      SET(CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES
+        "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
+    ELSE(CMAKE_REQUIRED_LIBRARIES)
+      SET(CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES)
+    ENDIF(CMAKE_REQUIRED_LIBRARIES)
+    IF(CMAKE_REQUIRED_INCLUDES)
+      SET(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES
+        "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
+    ELSE(CMAKE_REQUIRED_INCLUDES)
+      SET(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES)
+    ENDIF(CMAKE_REQUIRED_INCLUDES)
+    FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx"
+      "${SOURCE}\n")
+
+    MESSAGE(STATUS "Performing Test ${VAR}")
+    TRY_RUN(${VAR} ${VAR}_COMPILED
+      ${CMAKE_BINARY_DIR}
+      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
+      CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
+      "${CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES}"
+      "${CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES}"
+      OUTPUT_VARIABLE OUTPUT)
+    # if it did not compile make the return value fail code of 1
+    IF(NOT ${${VAR}_COMPILED})
+      SET(${VAR} 1)
+    ENDIF(NOT ${${VAR}_COMPILED})
+    # if the return value was 0 then it worked
+    SET(result_var ${${VAR}})
+    IF("${result_var}" EQUAL 0)
+      SET(${VAR} 1 CACHE INTERNAL "Test ${FUNCTION}")
+      MESSAGE(STATUS "Performing Test ${VAR} - Success")
+      FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log 
+        "Performing C++ SOURCE FILE Test ${VAR} succeded with the following output:\n"
+        "${OUTPUT}\n" 
+        "Return value: ${${VAR}}\n"
+        "Source file was:\n${SOURCE}\n")
+    ELSE("${result_var}" EQUAL 0)
+      MESSAGE(STATUS "Performing Test ${VAR} - Failed")
+      SET(${VAR} "" CACHE INTERNAL "Test ${FUNCTION}")
+      FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log 
+        "Performing C++ SOURCE FILE Test ${VAR} failed with the following output:\n"
+        "${OUTPUT}\n"  
+        "Return value: ${${VAR}}\n"
+        "Source file was:\n${SOURCE}\n")
+    ENDIF("${result_var}" EQUAL 0)
+  ENDIF("${VAR}" MATCHES "^${VAR}$")
+ENDMACRO(CHECK_CXX_SOURCE_RUNS)
+