Modify CHECK_C_SOURCE_* checks to fix builds using Visual Studio 12.

This is needed to fix build failures using Visual Studio 12 and using libraries such as liblzma which
have been built without the "/SAFESEH" linker flag (which is the usual case for libraries built using
the mingw toolchain).

1 files changed, 106 insertions, 0 deletions

diff --git a/build/cmake/LibarchiveCheckCSourceCompiles.cmake b/build/cmake/LibarchiveCheckCSourceCompiles.cmake
new file mode 100644
index 00000000..6b6f5933
--- /dev/null
+++ b/build/cmake/LibarchiveCheckCSourceCompiles.cmake
@@ -0,0 +1,106 @@
+# - Check if given C source compiles and links into an executable
+# CHECK_C_SOURCE_COMPILES(<code> <var> [FAIL_REGEX <fail-regex>])
+#  <code>       - source code to try to compile, must define 'main'
+#  <var>        - variable to store whether the source code compiled
+#  <fail-regex> - fail if test output matches this regex
+# 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 2005-2009 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 distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+#
+# Extra arguments added by libarchive
+# CMAKE_REQUIRED_LINKER_FLAGS = string of linker command line flags
+#
+
+include(CMakeExpandImportedTargets)
+
+
+macro(LIBARCHIVE_CHECK_C_SOURCE_COMPILES SOURCE VAR)
+  if("${VAR}" MATCHES "^${VAR}$")
+    set(_FAIL_REGEX)
+    set(_key)
+    foreach(arg ${ARGN})
+      if("${arg}" MATCHES "^(FAIL_REGEX)$")
+        set(_key "${arg}")
+      elseif(_key)
+        list(APPEND _${_key} "${arg}")
+      else()
+        message(FATAL_ERROR "Unknown argument:\n  ${arg}\n")
+      endif()
+    endforeach()
+    set(MACRO_CHECK_FUNCTION_DEFINITIONS
+      "-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
+    if(CMAKE_REQUIRED_LIBRARIES)
+      # this one translates potentially used imported library targets to their files on disk
+      CMAKE_EXPAND_IMPORTED_TARGETS(_ADJUSTED_CMAKE_REQUIRED_LIBRARIES  LIBRARIES  ${CMAKE_REQUIRED_LIBRARIES} CONFIGURATION "${CMAKE_TRY_COMPILE_CONFIGURATION}")
+      set(CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES
+        "-DLINK_LIBRARIES:STRING=${_ADJUSTED_CMAKE_REQUIRED_LIBRARIES}")
+    else()
+      set(CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES)
+    endif()
+    if(CMAKE_REQUIRED_INCLUDES)
+      set(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES
+        "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
+    else()
+      set(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES)
+    endif()
+	if(CMAKE_REQUIRED_LINKER_FLAGS)
+	  set(CHECK_C_SOURCE_COMPILES_ADD_LINKER_FLAGS
+	    "-DCMAKE_EXE_LINKER_FLAGS:STRING=${CMAKE_REQUIRED_LINKER_FLAGS} -DCMAKE_SHARED_LINKER_FLAGS:STRING=${CMAKE_REQUIRED_LINKER_FLAGS} -DCMAKE_MODULE_LINKER_FLAGS:STRING=${CMAKE_REQUIRED_LINKER_FLAGS}")
+	else()
+	  set(CHECK_C_SOURCE_COMPILES_ADD_LINKER_FLAGS)
+	endif()
+    file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c"
+      "${SOURCE}\n")
+
+    message(STATUS "Performing Test ${VAR}")
+    try_compile(${VAR}
+      ${CMAKE_BINARY_DIR}
+      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
+      CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS} ${CHECK_C_SOURCE_COMPILES_ADD_LINKER_FLAGS}
+      "${CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES}"
+      "${CHECK_C_SOURCE_COMPILES_ADD_INCLUDES}"
+      OUTPUT_VARIABLE OUTPUT)
+
+    foreach(_regex ${_FAIL_REGEX})
+      if("${OUTPUT}" MATCHES "${_regex}")
+        set(${VAR} 0)
+      endif()
+    endforeach()
+
+    if(${VAR})
+      set(${VAR} 1 CACHE INTERNAL "Test ${VAR}")
+      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"
+        "Source file was:\n${SOURCE}\n")
+    else()
+      message(STATUS "Performing Test ${VAR} - Failed")
+      set(${VAR} "" CACHE INTERNAL "Test ${VAR}")
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+        "Performing C SOURCE FILE Test ${VAR} failed with the following output:\n"
+        "${OUTPUT}\n"
+        "Source file was:\n${SOURCE}\n")
+    endif()
+  endif()
+endmacro()
+