Cmake configure for config.h.

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.19) # First to support Apple Silicon.
-project(mxml C)
+project(mxml LANGUAGES C VERSION 4.0.4)
 enable_testing()
 
 # Don't allow source tree pollution.
@@ -18,6 +18,36 @@ if(WIN32)
     )
 endif(WIN32)
 
+# ==================== CONFIG.H ====================
+# For now this is not thorough, but enough to work for 
+# the vast majority of cases.
+
+include(CheckIncludeFile)
+include(CheckTypeSize)
+
+set(MXML_VERSION ${CMAKE_PROJECT_VERSION})
+
+if(SIZEOF_LONG_LONG EQUAL "8")
+    option(HAVE_LONG_LONG_INT "Enable LONG LONG" ON)
+else()
+    option(HAVE_LONG_LONG_INT "Enable LONG LONG" OFF)
+endif()
+
+if (WIN32)
+    option(HAVE_PTHREAD_H "Disable PTHREAD for windows." OFF)
+else()
+    option(HAVE_PTHREAD_H "Enable PTHREAD as it's probably available." ON)
+endif()
+
+# For now assume inline on.
+option(inline "Enable inline function support." ON)
+
+configure_file(cmakeconfig.h.in ${CMAKE_CURRENT_SOURCE_DIR}/config.h
+    @ONLY
+)
+
+# ==================== /CONFIG.H ====================
+
 set(MXML_PRIVATE
     mxml-attr.c
     mxml-file.c

cmakeconfig.h.in

@@ -0,0 +1,42 @@
+//
+// A CMake compatible version for config.h.in -> config.h
+//
+
+#ifndef MXML_CONFIG_H
+#  define MXML_CONFIG_H
+#  include <stdio.h>
+#  include <stdlib.h>
+#  include <string.h>
+#  include <stdarg.h>
+#  include <ctype.h>
+
+
+//
+// Version number
+//
+
+#cmakedefine MXML_VERSION "@CMAKE_PROJECT_VERSION@"
+
+
+//
+// Inline function support
+//
+
+#cmakedefine inline
+
+
+//
+// Long long support
+//
+
+#cmakedefine01 HAVE_LONG_LONG_INT
+
+
+//
+// Have <pthread.h>?
+//
+
+#cmakedefine01 HAVE_PTHREAD_H
+
+
+#endif // !MXML_CONFIG_H