[build] improve (warning) compile flags

CMakeLists.txt

@@ -18,6 +18,26 @@ IF("${CMAKE_BUILD_TYPE}" STREQUAL "")
 ENDIF("${CMAKE_BUILD_TYPE}" STREQUAL "")
 
 OPTION(GCC_LIBEVENT_STATIC "link libevent static")
+OPTION(BUILD_EXTRA_WARNINGS "extra warnings")
+
+# default to ON
+SET(CMAKE_POSITION_INDEPENDENT_CODE ON CACHE BOOL "Default value for ``POSITION_INDEPENDENT_CODE`` of targets.")
+
+IF(BUILD_EXTRA_WARNINGS)
+	SET(WARN_CFLAGS "-g -O2 -g2 -Wall -Wmissing-declarations -Wdeclaration-after-statement -Wcast-align -Wsign-compare -Wnested-externs -Wpointer-arith -Wmissing-prototypes -Wshadow -Wno-pointer-sign -Wformat-security")
+	SET(WARN_LDFLAGS "-g -O2 -g2 -Wall -Wl,--as-needed -Wl,--no-undefined")
+ELSE(BUILD_EXTRA_WARNINGS)
+	SET(WARN_CFLAGS "")
+	SET(WARN_LDFLAGS "")
+ENDIF(BUILD_EXTRA_WARNINGS)
+
+IF(CMAKE_COMPILER_IS_GNUCC)
+	SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99 -Wall -g -Wshadow -W -pedantic")
+	SET(CMAKE_C_FLAGS_RELEASE        "${CMAKE_C_FLAGS_RELEASE}     -O2")
+	SET(CMAKE_C_FLAGS_DEBUG          "${CMAKE_C_FLAGS_DEBUG}       -O0")
+	SET(CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_WITHDEBINFO} -O2")
+	ADD_DEFINITIONS(-D_GNU_SOURCE)
+ENDIF(CMAKE_COMPILER_IS_GNUCC)
 
 # libevent
 pkg_check_modules (LIBEVENT REQUIRED libevent>=2.0)
@@ -38,7 +58,8 @@ INCLUDE_DIRECTORIES(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})
 
 add_executable(scgi-cgi ${MAIN_SOURCE})
 
-ADD_TARGET_PROPERTIES(scgi-cgi COMPILE_FLAGS "-std=gnu99 -Wall -g -Wshadow -W -pedantic -fPIC")
+ADD_TARGET_PROPERTIES(scgi-cgi COMPILE_FLAGS "${WARN_FLAGS}")
+TARGET_LINK_LIBRARIES(scgi-cgi ${WARN_LDFLAGS})
 
 # libev
 TARGET_LINK_LIBRARIES(scgi-cgi ${MYLIBEVENT_LDFLAGS})

cmake/AddTargetProperties.cmake

@@ -4,7 +4,7 @@ MACRO(ADD_TARGET_PROPERTIES _target _name)
     SET(_properties "${_properties} ${_prop}")
   ENDFOREACH(_prop)
   GET_TARGET_PROPERTY(_old_properties ${_target} ${_name})
-  MESSAGE(STATUS "adding property to ${_target} ${_name}:" ${_properties})
+  #MESSAGE(STATUS "adding property to ${_target} ${_name}:" ${_properties})
   IF(NOT _old_properties)
     # in case it's NOTFOUND
     SET(_old_properties)

configure.ac

@@ -33,16 +33,16 @@ if test "${GCC}" = "yes"; then
     CFLAGS="${CFLAGS} -Wall -W -Wshadow -pedantic -std=gnu99"
 fi
 
-AC_ARG_ENABLE(extra-warnings,
- AC_HELP_STRING([--enable-extra-warnings],[enable extra warnings (gcc specific)]),
+AC_ARG_ENABLE([extra-warnings],
+ [AS_HELP_STRING([--enable-extra-warnings],[enable extra warnings (gcc specific)])],
  [case "${enableval}" in
    yes) extrawarnings=true ;;
     no) extrawarnings=false ;;
-     *) AC_MSG_ERROR(bad value ${enableval} for --enable-extra-warnings) ;;
+     *) AC_MSG_ERROR([bad value ${enableval} for --enable-extra-warnings]) ;;
   esac],[extrawarnings=false])
 
 if test x$extrawarnings = xtrue; then
-    CFLAGS="${CFLAGS} -g -O2 -g2 -Wall -Wmissing-declarations -Wdeclaration-after-statement -Wno-pointer-sign -Wcast-align -Winline -Wsign-compare -Wnested-externs -Wpointer-arith -Wl,--as-needed -Wformat-security"
+    CFLAGS="${CFLAGS} -g -O2 -g2 -Wall -Wmissing-declarations -Wdeclaration-after-statement -Wcast-align -Wsign-compare -Wnested-externs -Wpointer-arith -Wmissing-prototypes -Wshadow -Wno-pointer-sign -Wformat-security -Wl,--as-needed -Wl,--no-undefined"
 fi
 
 AC_CONFIG_FILES([Makefile])