CMake: add macro fl_debug_var to debug variables.

Some debug messages are included, but currently disabled.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12658 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

CMake/macros.cmake

@@ -1,10 +1,10 @@
 #
 # "$Id$"
 #
-# macros.cmake defines macros used by the CMake build system
+# Macros used by the CMake build system for the Fast Light Tool Kit (FLTK).
 # Written by Michael Surette
 #
-# Copyright 1998-2017 by Bill Spitzak and others.
+# Copyright 1998-2018 by Bill Spitzak and others.
 #
 # This library is free software. Distribution and use rights are outlined in
 # the file "COPYING" which should have been included with this file.  If this
@@ -17,6 +17,34 @@
 #     http://www.fltk.org/str.php
 #
 
+#######################################################################
+# macros used for debugging purposes
+#######################################################################
+
+# This macro displays the name and value of a CMake variable.
+# The variable name is expanded with spaces to be (at least)
+# <min_len> (currently 24) characters wide for better readability.
+# VARNAME must be a string literal, e.g. WIN32 or "WIN32".
+#
+# Syntax:
+#   fl_debug_var(VARNAME)
+#
+# Example:
+#   fl_debug_var(WIN32)
+#   fl_debug_var("UNIX")
+#
+
+macro (fl_debug_var name)
+  set (min_len 24)
+  set (var "${name}")
+  string(LENGTH "${var}" len)
+  while (len LESS min_len)
+    string(APPEND var " ")
+    string(LENGTH "${var}" len)
+  endwhile (len LESS min_len)
+  message (STATUS "${var} = '${${name}}'")
+endmacro (fl_debug_var)
+
 #######################################################################
 # macros used by the build system
 #######################################################################

CMake/options.cmake

@@ -243,20 +243,18 @@ else (OPTION_USE_THREADS)
 
 endif (OPTION_USE_THREADS)
 
-set(debug_threads FALSE) # set to true to show debug info
+set (debug_threads 0) # set to 1 to show debug info
 if (debug_threads)
   message ("")
-  message (STATUS "NOTE: set debug_threads to FALSE to disable this info!")
-  message (STATUS "WIN32                  = '${WIN32}'")
-  message (STATUS "MINGW                  = '${MINGW}'")
-  message (STATUS "CYGWIN                 = '${CYGWIN}'")
-  message (STATUS "OPTION_USE_THREADS     = '${OPTION_USE_THREADS}'")
-  message (STATUS "HAVE_PTHREAD           = '${HAVE_PTHREAD}'")
-  message (STATUS "HAVE_PTHREAD_H         = '${HAVE_PTHREAD_H}'")
-  message (STATUS "FLTK_THREADS_FOUND     = '${FLTK_THREADS_FOUND}'")
-  message (STATUS "CMAKE_EXE_LINKER_FLAGS = '${CMAKE_EXE_LINKER_FLAGS}'")
+  message (STATUS "options.cmake: set debug_threads to 0 to disable the following info:")
+  fl_debug_var(OPTION_USE_THREADS)
+  fl_debug_var(HAVE_PTHREAD)
+  fl_debug_var(HAVE_PTHREAD_H)
+  fl_debug_var(FLTK_THREADS_FOUND)
+  fl_debug_var(CMAKE_EXE_LINKER_FLAGS)
+  message (STATUS "options.cmake: end of debug_threads info.")
 endif (debug_threads)
-unset(debug_threads)
+unset (debug_threads)
 
 #######################################################################
 option(OPTION_LARGE_FILE "enable large file support" ON)

CMakeLists.txt

@@ -44,6 +44,30 @@ include(CMake/resources.cmake)
 #######################################################################
 include(CMake/options.cmake)
 
+#######################################################################
+# print (debug) several build variables and options
+#######################################################################
+
+set (debug_build 0) # set to 1 to show debug info
+if (debug_build)
+  message ("")
+  message (STATUS "${CMAKE_CURRENT_LIST_DIR}/CMakeLists.txt: set debug_build to 0 to disable the following info:")
+  fl_debug_var(WIN32)
+  fl_debug_var(MINGW)
+  fl_debug_var(CYGWIN)
+  fl_debug_var(MSVC)
+  fl_debug_var(UNIX)
+  fl_debug_var(APPLE)
+  fl_debug_var(CMAKE_BUILD_TYPE)
+  fl_debug_var(CMAKE_SIZEOF_VOID_P)
+  fl_debug_var(OPTION_OPTIM)
+  fl_debug_var(CMAKE_C_FLAGS)
+  fl_debug_var(CMAKE_CXX_FLAGS)
+  fl_debug_var(CMAKE_EXE_LINKER_FLAGS)
+  message (STATUS "${CMAKE_CURRENT_LIST_DIR}/CMakeLists.txt: end of debug_build info.")
+endif (debug_build)
+unset (debug_build)
+
 #######################################################################
 # variables shared by export and install
 # export.cmake creates configuration files for direct use in a built but uninstalled FLTK