CMake: A more section comments

expat/CMakeLists.txt

@@ -12,6 +12,9 @@ set(PACKAGE_TARNAME "${PACKAGE_NAME}")
 
 include(GNUInstallDirs)
 
+#
+# Configuration defaults
+#
 if(WINCE)
     set(BUILD_tools_default OFF)
 else()
@@ -56,6 +59,9 @@ if(MSVC)
     set(MSVC_USE_STATIC_CRT OFF CACHE BOOL "Use /MT flag (static CRT) when compiling in MSVC")
 endif()
 
+#
+# Environment checks
+#
 if(USE_libbsd)
     find_library(LIB_BSD NAMES bsd)
     if(NOT LIB_BSD)
@@ -178,6 +184,9 @@ if(WIN32)
     set(CMAKE_DEBUG_POSTFIX "d" CACHE STRING "Add a suffix, usually d on Windows")
 endif(WIN32)
 
+#
+# C library
+#
 set(expat_SRCS
     lib/xmlparse.c
     lib/xmlrole.c
@@ -226,6 +235,9 @@ expat_install(TARGETS expat RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
 
 expat_install(FILES lib/expat.h lib/expat_external.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 
+#
+# pkg-config file
+#
 set(prefix ${CMAKE_INSTALL_PREFIX})
 set(exec_prefix "\${prefix}")
 set(libdir "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")
@@ -233,6 +245,9 @@ set(includedir "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
 configure_file(expat.pc.in ${CMAKE_CURRENT_BINARY_DIR}/expat.pc @ONLY)
 expat_install(FILES ${CMAKE_CURRENT_BINARY_DIR}/expat.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
 
+#
+# C command line tool xmlwf
+#
 if(BUILD_tools)
     set(xmlwf_SRCS
         xmlwf/xmlwf.c
@@ -252,6 +267,9 @@ if(BUILD_tools)
      endif()
 endif()
 
+#
+# C code examples
+#
 if(BUILD_examples)
     add_executable(elements examples/elements.c)
     set_property(TARGET elements PROPERTY RUNTIME_OUTPUT_DIRECTORY examples)
@@ -262,6 +280,9 @@ if(BUILD_examples)
     target_link_libraries(outline expat)
 endif(BUILD_examples)
 
+#
+# C/C++ test runners
+#
 if(BUILD_tests)
     ## these are unittests that can be run on any platform
     set(test_SRCS