MuPDF在iOS平台的编译

iOS平台虽然提供了方便的PDF渲染接口，但对于简体中文字体的支持并不完整，容易发生乱码。即使在iOS 5.0中有了一定的改善，但还是存在乱码问题。

MuPDF是一款开源的PDF阅读器，渲染效率相对较高，并且对简体中文字体的支持也很好。

官网：http://www.mupdf.com/

下载并解压缩MuPDF的源码后，打开Makerules文件，查看相关编译规则，支持平台有不少，但是没有mac编译iOS平台的规则，于是添加相关规则。

模拟器i386规则：

CC = /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2

AR = /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/ar

CPP = /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/cpp

CFLAGS += -arch i386 -m32 -pipe -mdynamic-no-pic -std=c99 -Wno-trigraphs -fpascal-strings -fasm-blocks -O0 -Wreturn-type -Wunused-variable -fmessage-length=0 -fvisibility=hidden -mmacosx-version-min=10.5 -I/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/usr/include/
-isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk

LDFLAGS +=-arch i386 -m32 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk -Wl,-dead_strip -mmacosx-version-min=10.5

CROSSCOMPILE=yes

NOX11=yes

真机armv6规则：

CC = /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2

AR = /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ar

CPP = /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/cpp

CFLAGS += -arch armv6 -pipe -mdynamic-no-pic -std=gnu99 -Wno-trigraphs -fpascal-strings -O2 -Wreturn-type -Wunused-variable -fmessage-length=0 -fvisibility=hidden -miphoneos-version-min=4.2 -I/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/usr/include/libxml2
-isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk

LDFLAGS += -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk -miphoneos-version-min=4.2

CROSSCOMPILE=yes

NOX11=yes

真机armv7规则：

CC = /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2

AR = /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ar

CPP = /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/cpp

CFLAGS += -arch armv7 -pipe -mdynamic-no-pic -std=gnu99 -Wno-trigraphs -fpascal-strings -O2 -Wreturn-type -Wunused-variable -fmessage-length=0 -fvisibility=hidden -miphoneos-version-min=4.2 -I/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/usr/include/libxml2
-isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk

LDFLAGS += -arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk -miphoneos-version-min=4.2

CROSSCOMPILE=yes

NOX11=yes

执行make libs命令，在目录下生成*.a库文件。

在过程中遇见过一些问题：

生成库文件后，在工程中调用相关接口，提示错误：ld: symbol(s) not found

经过排查，原来犯了个小错误：

MuPDF是使用C编译器编译，但是工程使用c++编译，所以需要在引用文件添加

extern "C" {

#include <fitz.h>

#include <mupdf.h>

}

编译真机版库文件时候，提示错误：‘asm’ undeclared (first use in this function)

进过排查，编译参数设置错误，将-std=c99换成-std=gnu99就成功了。

详情可见：

What's the difference between GNU99 and C99 (Clang)?
http://stackoverflow.com/questions/5313536/whats-the-difference-between-gnu99-and-c99-clang
终于木有乱码了：