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

2 files changed, 39 insertions, 13 deletions

diff --git a/CMake/macros.cmake b/CMake/macros.cmake
index c8b79b390..1118a9f17 100644
--- a/CMake/macros.cmake
+++ b/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
@@ -18,6 +18,34 @@
 #
 
 #######################################################################
+# 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
 #######################################################################
 macro(FL_ADD_LIBRARY LIBNAME LIBTYPE LIBFILES)
diff --git a/CMake/options.cmake b/CMake/options.cmake
index cfb379459..da4d781bc 100644
--- a/CMake/options.cmake
+++ b/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)