Use a better method for determining if shared functions exist

3 files changed, 92 insertions, 108 deletions

diff --git a/cmake/CheckSharedFunctionExists.c b/cmake/CheckSharedFunctionExists.c
deleted file mode 100644
index 31e3fa92..00000000
--- a/cmake/CheckSharedFunctionExists.c
+++ /dev/null
@@ -1,38 +0,0 @@
-#ifdef CHECK_SHARED_FUNCTION_EXISTS
-
-#include <stdlib.h>
-
-#ifndef CALLSTACK
-#define CALLSTACK
-#endif
-
-#ifdef _WIN32
-#ifdef ARGSTACK
-char __stdcall CHECK_SHARED_FUNCTION_EXISTS(ARGSTACK);
-#else
-char __stdcall CHECK_SHARED_FUNCTION_EXISTS(void);
-#endif
-#else
-char CHECK_SHARED_FUNCTION_EXISTS();
-#endif
-
-#ifdef __CLASSIC_C__
-int main(){
-  int ac;
-  char*av[];
-#else
-int main(int ac, char*av[]){
-#endif
-  CHECK_SHARED_FUNCTION_EXISTS(CALLSTACK);
-  if(ac > 1000)
-    {
-    return *av[0];
-    }
-  return 0;
-}
-
-#else  /* CHECK_SHARED_FUNCTION_EXISTS */
-
-#  error "CHECK_SHARED_FUNCTION_EXISTS has to specify the function"
-
-#endif /* CHECK_SHARED_FUNCTION_EXISTS */
diff --git a/cmake/CheckSharedFunctionExists.cmake b/cmake/CheckSharedFunctionExists.cmake
new file mode 100644
index 00000000..4980effa
--- /dev/null
+++ b/cmake/CheckSharedFunctionExists.cmake
@@ -0,0 +1,92 @@
+# - Check if a symbol exists as a function, variable, or macro
+# CHECK_SYMBOL_EXISTS(<symbol> <files> <variable>)
+#
+# Check that the <symbol> is available after including given header
+# <files> and store the result in a <variable>.  Specify the list
+# of files in one argument as a semicolon-separated list.
+#
+# If the header files define the symbol as a macro it is considered
+# available and assumed to work.  If the header files declare the
+# symbol as a function or variable then the symbol must also be
+# available for linking.  If the symbol is a type or enum value
+# it will not be recognized (consider using CheckTypeSize or
+# CheckCSourceCompiles).
+#
+# 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
+
+#=============================================================================
+# Copyright 2003-2011 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 distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+MACRO(CHECK_SHARED_FUNCTION_EXISTS SYMBOL FILES LIBRARY LOCATION VARIABLE)
+  IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+    SET(CMAKE_CONFIGURABLE_FILE_CONTENT "/* */\n")
+    SET(MACRO_CHECK_SYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS})
+    IF(CMAKE_REQUIRED_LIBRARIES)
+      SET(CHECK_SYMBOL_EXISTS_LIBS 
+        "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES};${LIBRARY}")
+    ELSE(CMAKE_REQUIRED_LIBRARIES)
+      SET(CHECK_SYMBOL_EXISTS_LIBS
+        "-DLINK_LIBRARIES:STRING=${LIBRARY}")
+    ENDIF(CMAKE_REQUIRED_LIBRARIES)
+    IF(CMAKE_REQUIRED_INCLUDES)
+      SET(CMAKE_SYMBOL_EXISTS_INCLUDES
+        "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
+    ELSE(CMAKE_REQUIRED_INCLUDES)
+      SET(CMAKE_SYMBOL_EXISTS_INCLUDES)
+    ENDIF(CMAKE_REQUIRED_INCLUDES)
+    FOREACH(FILE ${FILES})
+      SET(CMAKE_CONFIGURABLE_FILE_CONTENT
+        "${CMAKE_CONFIGURABLE_FILE_CONTENT}#include <${FILE}>\n")
+    ENDFOREACH(FILE)
+    SET(CMAKE_CONFIGURABLE_FILE_CONTENT
+      "${CMAKE_CONFIGURABLE_FILE_CONTENT}\nvoid cmakeRequireSymbol(int dummy,...){(void)dummy;}\nint main()\n{\n  cmakeRequireSymbol(0,&${SYMBOL});\n  return 0;\n}\n")
+
+    CONFIGURE_FILE("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in"
+      "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c" @ONLY)
+
+    MESSAGE(STATUS "Looking for ${SYMBOL} in ${LIBRARY}")
+    TRY_COMPILE(${VARIABLE}
+      ${CMAKE_BINARY_DIR}
+      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
+      CMAKE_FLAGS 
+      -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS}
+      -DLINK_DIRECTORIES:STRING=${LOCATION}
+      "${CHECK_SYMBOL_EXISTS_LIBS}"
+      "${CMAKE_SYMBOL_EXISTS_INCLUDES}"
+      OUTPUT_VARIABLE OUTPUT)
+    IF(${VARIABLE})
+      MESSAGE(STATUS "Looking for ${SYMBOL} in ${LIBRARY} - found")
+      SET(${VARIABLE} 1 CACHE INTERNAL "Have symbol ${SYMBOL} in ${LIBRARY}")
+      FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log 
+        "Determining if the ${SYMBOL} "
+        "exist in ${LIBRARY} passed with the following output:\n"
+        "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c:\n"
+        "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")
+    ELSE(${VARIABLE})
+      MESSAGE(STATUS "Looking for ${SYMBOL} in ${LIBRARY} - not found.")
+      SET(${VARIABLE} "" CACHE INTERNAL "Have symbol ${SYMBOL} in ${LIBRARY}")
+      FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log 
+        "Determining if the ${SYMBOL} "
+        "exist in ${LIBRARY} failed with the following output:\n"
+        "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c:\n"
+        "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")
+    ENDIF(${VARIABLE})
+  ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+ENDMACRO(CHECK_SHARED_FUNCTION_EXISTS)
diff --git a/cmake/CheckSharedLibraryExists.cmake b/cmake/CheckSharedLibraryExists.cmake
deleted file mode 100644
index 0069d892..00000000
--- a/cmake/CheckSharedLibraryExists.cmake
+++ /dev/null
@@ -1,70 +0,0 @@
-# - Check if the function exists.
-# CHECK_LIBRARY_EXISTS (LIBRARY FUNCTION LOCATION VARIABLE)
-#
-#  LIBRARY  - the name of the library you are looking for
-#  FUNCTION - the name of the function
-#  ARGCOUNT - number of arguments for stdcall functions
-#  LOCATION - location where the library should be found
-#  VARIABLE - variable to store the result
-#
-# The following variables may be set before calling this macro to
-# modify the way the check is run:
-#
-#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
-#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
-#  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
-
-MACRO(CHECK_SHARED_LIBRARY_EXISTS LIBRARY FUNCTION ARGCOUNT LOCATION VARIABLE)
-  IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
-    SET(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION 
-      "-DCHECK_SHARED_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
-    IF(WIN32)
-        IF(${ARGCOUNT} GREATER 0)
-            SET(ARGSTACK "void*")
-            SET(CALLSTACK "NULL")
-            SET(CURARG 1)
-            WHILE(${ARGCOUNT} GREATER ${CURARG})
-                SET(ARGSTACK "${ARGSTACK},void*")
-                SET(CALLSTACK "${CALLSTACK},NULL")
-                MATH(EXPR CURARG "${CURARG} + 1")
-            ENDWHILE(${ARGCOUNT} GREATER ${CURARG})
-            SET(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION
-                "-D_WIN32 -DARGSTACK=\"${ARGSTACK}\" -DCALLSTACK=\"${CALLSTACK}\" ${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}")
-        ELSE(${ARGCOUNT} GREATER 0)
-            SET(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION
-                "-D_WIN32 ${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}")
-        ENDIF(${ARGCOUNT} GREATER 0)
-    ENDIF(WIN32)
-    MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY}")
-    SET(CHECK_LIBRARY_EXISTS_LIBRARIES ${LIBRARY})
-    IF(CMAKE_REQUIRED_LIBRARIES)
-      SET(CHECK_LIBRARY_EXISTS_LIBRARIES 
-        ${CHECK_LIBRARY_EXISTS_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES})
-    ENDIF(CMAKE_REQUIRED_LIBRARIES)
-    TRY_COMPILE(${VARIABLE}
-      ${CMAKE_BINARY_DIR}
-      ${CMAKE_SOURCE_DIR}/cmake/CheckSharedFunctionExists.c
-      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
-      CMAKE_FLAGS 
-      -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}
-      -DLINK_DIRECTORIES:STRING=${LOCATION}
-      "-DLINK_LIBRARIES:STRING=${CHECK_LIBRARY_EXISTS_LIBRARIES}"
-      OUTPUT_VARIABLE OUTPUT)
-
-    IF(${VARIABLE})
-      MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - found")
-      SET(${VARIABLE} 1 CACHE INTERNAL "Have library ${LIBRARY}")
-      FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log 
-        "Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
-        "passed with the following output:\n"
-        "${OUTPUT}\n\n")
-    ELSE(${VARIABLE})
-      MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - not found")
-      SET(${VARIABLE} "" CACHE INTERNAL "Have library ${LIBRARY}")
-      FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log 
-        "Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
-        "failed with the following output:\n"
-        "${OUTPUT}\n\n")
-    ENDIF(${VARIABLE})
-  ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
-ENDMACRO(CHECK_SHARED_LIBRARY_EXISTS)