正则表达式pcre在Android下的移植

http://www.cnblogs.com/hibraincol/archive/2011/10/15/2213714.html

因为项目需要在android的NDK开发中使用pcre正则表达式库，而android系统中并没有自带该库，所以就得另外移植了，下面是移植的详细步骤：

1. 下载pcre源码，可以到http://sourceforge.net/projects/pcre/下载源码。
我这里使用的是pcre-7.8.tar.gz 。

2. 将pcre-7.8 的源码拷贝至android源码树下的external/pcre目录下。

3. 将下面的Android.mk文件拷贝到external/pcre目录下。

Android.mk:

#---------------------------------------------------------------------------------
#

		#  Android makefile for libpcre
	
		#
	
		#  This makefile generates libpcre.a, pcregrep and pcre.h ONLY.
	
		#  It should be amended to build libpcreposix.a, libpcrecpp.a
	
		#  and tests.
	
		LOCAL_PATH := $(call my-dir)
	
		###
	
		### Build libpcre.a and pcre.h
	
		###
	
		include $(CLEAR_VARS)
	
		#step 1:
	
		# to generate the files  config.h pcre.h pcre_chartables.c 
	
		#
	
		GEN := $(LOCAL_PATH)/config.h
	
		$(GEN): $(LOCAL_PATH)/config.h.generic
	
		    $(hide) cp $(LOCAL_PATH)/config.h.generic $@
	
		LOCAL_GENERATED_SOURCES += $(GEN)
	
		GEN := $(LOCAL_PATH)/pcre.h
	
		$(GEN): $(LOCAL_PATH)/pcre.h.generic
	
		    $(hide) cp $(LOCAL_PATH)/pcre.h.generic $@
	
		LOCAL_GENERATED_SOURCES += $(GEN)
	
		GEN := $(LOCAL_PATH)/pcre_chartables.c
	
		$(GEN): $(LOCAL_PATH)/pcre_chartables.c.dist
	
		    $(hide) cp $(LOCAL_PATH)/pcre_chartables.c.dist $@
	
		LOCAL_GENERATED_SOURCES += $(GEN)
	
		#step 2:
	
		#clear the vars generated by the step 1 
	
		# 
	
		include $(CLEAR_VARS)
	
		LOCAL_SRC_FILES :=  
	
		  pcre_compile.c 
	
		  pcre_config.c 
	
		  pcre_dfa_exec.c 
	
		  pcre_exec.c 
	
		  pcre_fullinfo.c 
	
		  pcre_get.c 
	
		  pcre_globals.c 
	
		  pcre_info.c 
	
		  pcre_internal.h 
	
		  pcre_maketables.c 
	
		  pcre_newline.c 
	
		  pcre_ord2utf8.c 
	
		  pcre_refcount.c 
	
		  pcre_study.c 
	
		  pcre_tables.c 
	
		  pcre_try_flipped.c 
	
		  pcre_ucd.c 
	
		  pcre_valid_utf8.c 
	
		  pcre_version.c 
	
		  pcre_xclass.c 
	
		  pcre_chartables.c 
	
		  ucp.h 
	
		  pcre.h 
	
		  config.h
	
		#copy the pcre.h to out/target/product/generic/obj/include/libpcre
	
		#
	
		LOCAL_COPY_HEADERS := pcre.h
	
		LOCAL_COPY_HEADERS_TO := libpcre
	
		LOCAL_CFLAGS += -O3 -I. -DHAVE_CONFIG_H
	
		LOCAL_MODULE := libpcre
	
		LOCAL_MODULE_CLASS := STATIC_LIBRARIES
	
		LOCAL_PRELINK_MODULE := false
	
		include $(BUILD_STATIC_LIBRARY)
	
		###
	
		### Build pcregrep
	
		###
	
		include $(CLEAR_VARS)
	
		LOCAL_MODULE := pcregrep
	
		LOCAL_SRC_FILES := pcregrep.c
	
		LOCAL_CFLAGS += -O3 -I. -DHAVE_CONFIG_H
	
		LOCAL_STATIC_LIBRARIES := libpcre
	
		include $(BUILD_EXECUTABLE)

#---------------------------------------------------------------------------------

4. cd 到 android的源码树的根目录下，输入命令：

. build/envsetup.sh

chooseproduct
mmm external/pcre
从下面的log可以看到生成了libpcre.a库：

然后只要把libpcre.a库和头文件pcre.h拷贝到你的android应用工程中，然后就可以在ndk中使用这个pcre库了。

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