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From 34d55f6d771bcf026f453457f45d787391910598 Mon Sep 17 00:00:00 2001
From: Christoph Junghans <junghans@votca.org>
Date: Tue, 2 Feb 2016 13:56:50 -0700
Subject: [PATCH] cmake: fixed CheckCXXLibraryExists() with >=cmake-3.4
---
CMakeModules/CheckCXXLibraryExists.cmake | 6 +-----
CMakeModules/CheckFunctionExists.cpp | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+), 5 deletions(-)
create mode 100644 CMakeModules/CheckFunctionExists.cpp
diff --git a/CMakeModules/CheckCXXLibraryExists.cmake b/CMakeModules/CheckCXXLibraryExists.cmake
index 9c76fe2..d84aea7 100644
--- a/CMakeModules/CheckCXXLibraryExists.cmake
+++ b/CMakeModules/CheckCXXLibraryExists.cmake
@@ -54,13 +54,9 @@ macro(CHECK_CXX_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE)
set(CHECK_LIBRARY_EXISTS_LIBRARIES
${CHECK_LIBRARY_EXISTS_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES})
endif()
- if(NOT EXISTS ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckFunctionExists.cpp)
- file(COPY ${CMAKE_ROOT}/Modules/CheckFunctionExists.c DESTINATION ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY})
- file(RENAME ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckFunctionExists.c ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckFunctionExists.cpp)
- endif()
try_compile(${VARIABLE}
${CMAKE_BINARY_DIR}
- ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckFunctionExists.cpp
+ ${CMAKE_CURRENT_SOURCE_DIR}/CMakeModules/CheckFunctionExists.cpp
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
LINK_LIBRARIES ${CHECK_LIBRARY_EXISTS_LIBRARIES}
CMAKE_FLAGS
diff --git a/CMakeModules/CheckFunctionExists.cpp b/CMakeModules/CheckFunctionExists.cpp
new file mode 100644
index 0000000..607b3e8
--- /dev/null
+++ b/CMakeModules/CheckFunctionExists.cpp
@@ -0,0 +1,23 @@
+#ifdef CHECK_FUNCTION_EXISTS
+
+char CHECK_FUNCTION_EXISTS();
+#ifdef __CLASSIC_C__
+int main(){
+ int ac;
+ char*av[];
+#else
+int main(int ac, char*av[]){
+#endif
+ CHECK_FUNCTION_EXISTS();
+ if(ac > 1000)
+ {
+ return *av[0];
+ }
+ return 0;
+}
+
+#else /* CHECK_FUNCTION_EXISTS */
+
+# error "CHECK_FUNCTION_EXISTS has to specify the function"
+
+#endif /* CHECK_FUNCTION_EXISTS */
--
2.7.3
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