[pkg-d-commits] [ldc] 54/149: [CMake] Add CheckDSourceCompiles.cmake macro that can check whether a piece of D code compiles with some optional compiler flags.

[Matthias Klumpp]

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mak pushed a commit to annotated tag v1.2.0
in repository ldc.

commit 29f148778ddc6f75980ee56984093d49869e48b8
Author: Johan Engelen <jbc.engelen at gmail.com>
Date:   Wed Jan 25 22:38:35 2017 +0100

    [CMake] Add CheckDSourceCompiles.cmake macro that can check whether a piece of D code compiles with some optional compiler flags.
---
 cmake/Modules/CheckDSourceCompiles.cmake | 70 ++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/cmake/Modules/CheckDSourceCompiles.cmake b/cmake/Modules/CheckDSourceCompiles.cmake
new file mode 100644
index 0000000..048e175
--- /dev/null
+++ b/cmake/Modules/CheckDSourceCompiles.cmake
@@ -0,0 +1,70 @@
+# This file is modified from CMake's CheckCxxSourceCompiles.cmake.
+# Distributed under the OSI-approved BSD 3-Clause License.  See https://cmake.org/licensing for details.
+
+# Check if given D source compiles and links into an executable
+#
+# CHECK_D_SOURCE_COMPILES(<code> <var> [FLAGS <flags>])
+#
+# ::
+#
+#   <code>       - source code to try to compile
+#   <var>        - variable to store whether the source code compiled
+#                  Will be created as an internal cache variable.
+#   <flags>      - Extra commandline flags passed to the compiler.
+#
+# The D_COMPILER variable is read and must point to the D compiler executable.
+
+macro(CHECK_D_SOURCE_COMPILES SOURCE VAR)
+  if(NOT DEFINED "${VAR}")
+    set(_FLAGS)
+    set(_key)
+    foreach(arg ${ARGN})
+      if("${arg}" MATCHES "^(FLAGS)$")
+        set(_key "${arg}")
+      elseif(_key)
+        list(APPEND _${_key} "${arg}")
+        set(_key 0)
+      else()
+        message(FATAL_ERROR "Unknown argument:\n  ${arg}\n")
+      endif()
+    endforeach()
+
+    file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.d"
+      "${SOURCE}\n")
+
+    if(NOT CMAKE_REQUIRED_QUIET)
+      message(STATUS "Performing Test ${VAR}")
+    endif()
+
+    execute_process(COMMAND ${D_COMPILER} ${_FLAGS} ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.d
+                OUTPUT_VARIABLE OUTPUT
+                ERROR_VARIABLE OUTPUT
+                RESULT_VARIABLE RETVAL)
+
+    if(${RETVAL})
+      set(${VAR} 0)
+    else()
+      set(${VAR} 1)
+    endif()
+
+    if(${VAR})
+      set(${VAR} 1 CACHE INTERNAL "Test ${VAR}")
+      if(NOT CMAKE_REQUIRED_QUIET)
+        message(STATUS "Performing Test ${VAR} - Success")
+      endif()
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+        "Performing D SOURCE FILE Test ${VAR} succeeded with the following output:\n"
+        "${OUTPUT}\n"
+        "Source was:\n${SOURCE}\n")
+    else()
+      if(NOT CMAKE_REQUIRED_QUIET)
+        message(STATUS "Performing Test ${VAR} - Failed")
+      endif()
+      set(${VAR} "" CACHE INTERNAL "Test ${VAR}")
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+        "Performing D SOURCE FILE Test ${VAR} failed with the following output:\n"
+        "${OUTPUT}\n"
+        "Source was:\n${SOURCE}\n")
+    endif()
+  endif()
+endmacro()

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