如何在MacOS上编译同时支持32bit和64bit的universal库文件

原来总是依赖homebrew, 然后这个东西总是会吧-arch i386 -arch x86_64给你去掉, 无法编译出universal的包 还不如自己下载包编译, 主要就是注意有些包使用了汇编代码(加速), 去掉这个功能或者分开编译即可

###含有ABI的编译

通过指定分别CFLAGS,CXXFLAGS,LDFLAGS 为-arch i386 或者 -arch x86_64, 并且将ABI对应设置为’32’ 或 ‘64’ 分别编译出32bit和64bit版本, 并把两个版本的库文件分别保存
然后通过lipo工具将两个版本的库合成一个, 命令类似’lipo -create 32bit.dylib 64bit.dylib -output universal.dylib’

###编译工具的不同

普通编译时有遇到’llvm-gcc-4.2: -E, -S, -save-temps and -M options are not allowed with multiple -arch flags’错误, 也就是说这个gcc不支持通知编译多个arch
看下llvm-gcc-4.2 -v:

Using built-in specs.
Target: i686-apple-darwin11
Configured with: /private/var/tmp/llvmgcc42/llvmgcc42-2336.11~148/src/configure --disable-checking --enable-werror --prefix=/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2 --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-prefix=llvm- --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with-slibdir=/usr/lib --build=i686-apple-darwin11 --enable-llvm=/private/var/tmp/llvmgcc42/llvmgcc42-2336.11~148/dst-llvmCore/Developer/usr/local --program-prefix=i686-apple-darwin11- --host=x86_64-apple-darwin11 --target=i686-apple-darwin11 --with-gxx-include-dir=/usr/include/c++/4.2.1
Thread model: posix
gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)

看到这里有个’Target: i686-apple-darwin11’,明显, 这个编译器是i686平台的

再看clang -v:

Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.2.0
Thread model: posix

看到Target: x86_64-apple-darwin12.2.0, 也就是是个64位的编译器, 能支持多个arch; 通过configure中加CC=clang CXX=clang++指定

###LIBS

如果某个库使用了第三方库, 且需要指定需要链接的库, 比如

./configure libabcd_CFLAGS=/usr/local/ libabcd_LIBS=/usr/local/ 

那么就需要LIBS="-labcd" 告诉编译器去哪里找这个库

libimobiledevie 编译示例

1. gmp

   需要分i386 和 x86_64 分别编译, 然后lipo合并

   1) i386

    make build-i386
    cd  build-i386
    ../configure CFLAGS='-arch i386' LDFLAGS='-arch i386' CXXFLAG='-arch i386' --prefix=/usr/local ABI=32
    make -j 4
    sudo make install
    cd ..
       
    #改名, 以备后面使用
    sudo mv /usr/local/lib/libgmp.10.dylib /usr/local/lib/libgmp.10.i386.dylib
    sudo mv /usr/local/lib/libgmp.a /usr/local/lib/libgmp.i386.a
   

   2) x86_64

    make build-x84_64
    cd build-x84_64
    ../configure CFLAGS='-arch x86_64' LDFLAGS='-arch x86_64' CXXFLAG='-arch x86_64' --prefix=/usr/local ABI=64
    make -j 4
    sudo make install
    cd ..
       
    #改名, 以备后面使用
    sudo mv /usr/local/lib/libgmp.10.dylib /usr/local/lib/libgmp.10.x84_64.dylib
    sudo mv /usr/local/lib/libgmp.a /usr/local/lib/libgmp.x84_64.a
   

   3) 生成universal的包

    cd /usr/local/lib
    sudo lipo -create libgmp.10.i386.dylib libgmp.10.x84_64.dylib -output libgmp.10.dylib
    sudo lipo -create libgmp.i386.a libgmp.x84_64.a -output libgmp.a
   

   4)验证下

    lipo -info libgmp.dylib libgmp.a
            Architectures in the fat file: libgmp.dylib are: i386 x86_64
            Architectures in the fat file: libgmp.a are: i386 x86_64
   

   5) 修改头文件

    sudo vi /usr/local/include/gmp.h 
        #if defined(__i386__)
        #define __GMP_HAVE_HOST_CPU_FAMILY_power   0
        #define __GMP_HAVE_HOST_CPU_FAMILY_powerpc 0
        #define GMP_LIMB_BITS                      32
        #define GMP_NAIL_BITS                      0
        #elif defined(__x86_64__)
        #define __GMP_HAVE_HOST_CPU_FAMILY_power   0
        #define __GMP_HAVE_HOST_CPU_FAMILY_powerpc 0
        #define GMP_LIMB_BITS                      64
        #define GMP_NAIL_BITS                      0
        #elif defined(__ppc__)
        #define __GMP_HAVE_HOST_CPU_FAMILY_power   0
        #define __GMP_HAVE_HOST_CPU_FAMILY_powerpc 1
        #define GMP_LIMB_BITS                      32
        #define GMP_NAIL_BITS                      0
        #elif defined(__powerpc64__)
        #define __GMP_HAVE_HOST_CPU_FAMILY_power   0
        #define __GMP_HAVE_HOST_CPU_FAMILY_powerpc 1
        #define GMP_LIMB_BITS                      64
        #define GMP_NAIL_BITS                      0
        #else
        #error Unsupported architecture
        #endif
   

2.nettle, 同上分别编译后合并

3.pll-ket, configure时直接 CFLAGS=’-arch i386 -arch x86_64’ CXXFLAGS…. 编译universal

4.libimobiledevice

export PKG_CONFIG_PATH=/usr/lib/pkgconfig:/usr/local/lib/pkgconfig
./configure --disable-dependency-tracking --prefix=/usr/local/ --without-cython CFLAGS='-arch i386 -arch x86_64' LDFLAGS='-arch i386 -arch x86_64' CXXFLAG='-arch i386 -arch x86_64' CC=clang CXX=clang++ LIBS='-lplist -lusbmuxd -lcrypto -lssl'