cmake: Calculate padding for dislaying options automatically.

CMakeLists.txt

@@ -313,6 +313,8 @@ if (NOT DEFINED SDL_SHARED_ENABLED_BY_DEFAULT)
   endif()
 endif()
 
+set(LONGESTOPTIONNAME 0)  # set_option and friends will change this.
+
 set(SDL_SUBSYSTEMS
     Atomic Audio Video Render Events Joystick Haptic Power Threads Timers
     File Loadso CPUinfo Filesystem Dlopen Sensor Locale)
@@ -2533,10 +2535,9 @@ message(STATUS "")
 message(STATUS "Options:")
 list(SORT ALLOPTIONS)
 foreach(_OPT ${ALLOPTIONS})
-  # Longest option is SDL_WAYLAND_LIBDECOR_SHARED = 27 characters
   # Get the padding
   string(LENGTH ${_OPT} _OPTLEN)
-  math(EXPR _PADLEN "28 - ${_OPTLEN}")
+  math(EXPR _PADLEN "(${LONGESTOPTIONNAME} + 1) - ${_OPTLEN}")
   string(RANDOM LENGTH ${_PADLEN} ALPHABET " " _PADDING)
   message_tested_option(${_OPT} ${_PADDING})
 endforeach()

cmake/macros.cmake

@@ -1,5 +1,13 @@
+macro(ADD_TO_ALLOPTIONS _NEWNAME)
+  list(APPEND ALLOPTIONS ${_NEWNAME})
+  string(LENGTH ${_NEWNAME} _SLEN)
+  if(${LONGESTOPTIONNAME} LESS ${_SLEN})
+    set(LONGESTOPTIONNAME ${_SLEN})
+  endif()
+endmacro()
+
 macro(SET_OPTION _NAME _DESC)
-  list(APPEND ALLOPTIONS ${_NAME})
+  add_to_alloptions(${_NAME})
   if(${ARGC} EQUAL 3)
     set(_DEFLT ${ARGV2})
   else()
@@ -9,12 +17,12 @@ macro(SET_OPTION _NAME _DESC)
 endmacro()
 
 macro(DEP_OPTION _NAME _DESC _DEFLT _DEPTEST _FAILDFLT)
-  list(APPEND ALLOPTIONS ${_NAME})
+  add_to_alloptions(${_NAME})
   cmake_dependent_option(${_NAME} ${_DESC} ${_DEFLT} ${_DEPTEST} ${_FAILDFLT})
 endmacro()
 
 macro(OPTION_STRING _NAME _DESC _VALUE)
-  list(APPEND ALLOPTIONS ${_NAME})
+  add_to_alloptions(${_NAME})
   set(${_NAME} ${_VALUE} CACHE STRING "${_DESC}")
   set(HAVE_${_NAME} ${_VALUE})
 ENDMACRO()