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113 lines
4.4 KiB
Markdown
113 lines
4.4 KiB
Markdown
## OSXCross: OS X cross toolchain for Linux ##
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### WHAT IS THE GOAL OF OSXCROSS? ###
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The goal of OSXCross is to deliever you a high quality cross toolchain targeting OS X on Linux.
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### HOW DOES IT WORK? ###
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[Clang/LLVM is a cross compiler by default](http://clang.llvm.org/docs/CrossCompilation.html) and is now available on nearly every Linux distrubtion.
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Therefore we "just" need a proper
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[port](https://code.google.com/p/ios-toolchain-based-on-clang-for-linux/source/browse/#svn%2Ftrunk%2Fcctools-porting%2Fpatches)
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of the [cctools](http://www.opensource.apple.com/tarballs/cctools) (ld, lipo, ...) for Linux, and the OS X SDK.
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If you want, then you can build an up-to-date vanilla GCC as well.
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### WHAT IS NOT WORKING (YET)? ###
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* Clang:
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* using [libc++](http://libcxx.llvm.org/) (`-stdlib=libc++`) doesn't work yet (missing headers, besides that it should work)
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* GCC:
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* debug info is weak, because of the [missing](https://github.com/tpoechtrager/osxcross/blob/master/patches/gcc-dsymutil.patch)
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[`dsymutil`](http://www.manpagez.com/man/1/dsymutil) (shows only function names, no line numbers)
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* GCC itself [doesn't build with GCC](https://github.com/tpoechtrager/osxcross/commit/12f5dcdde4bc1000180d25ffda229f0a13cf723d),
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but builds fine when clang is used to build GCC
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Everything else besides that should work.
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### WHAT CAN I BUILD WITH IT? ###
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Basically everything you can build on OS X with clang/gcc should build with this cross toolchain as well.
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### INSTALLATION: ###
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Download the SDK version you want to the tarball/ (important!) directory.
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Then assure you have the following installed on your Linux box:
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`Clang 3.2+`, `llvm-devel`, `automake`, `autogen`, `libtool`,
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`libxml2-devel`, `libuuid-devel`, `openssl-devel` and the `bash shell`.
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Now edit the `SDK_VERSION` in `build.sh`, so it matches the version you have downloaded before.
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Then run `./build.sh` to build the cross toolchain (It will build in it's own directory).
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**Don't forget** to add the printed `export PATH=...` to your `~/.profile` or `~/.bashrc`.
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Then either run `source ~/.profile` or restart your shell session.
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That's it. See Usage Examples below.
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##### Building GCC: #####
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If you want to build GCC as well, then you can do this by running `./build_gcc.sh`.
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But before you do this, make sure you have got the gcc build depedencies installed on your system,
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on debian like systems you can run `apt-get build-dep gcc` to install them.
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### SDK DOWNLOAD LINKS: ###
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### Usage Examples: ###
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##### Let's say you want to compile a file called test.cpp, then you can do this by running: #####
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* Clang:
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* 32 bit: `o32-clang test.cpp -O3 -o test` OR `i386-apple-darwinXX-clang test.cpp -O3 -o test`
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* 64 bit: `o64-clang test.cpp -O3 -o test` OR `x86_64-apple-darwinXX-clang test.cpp -O3 -o test`
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* GCC:
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* 32 bit: `o32-gcc test.cpp -O3 -o test` OR `i386-apple-darwinXX-gcc test.cpp -O3 -o test`
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* 64 bit: `o64-gcc test.cpp -O3 -o test` OR `x86_64-apple-darwinXX-gcc test.cpp -O3 -o test`
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XX= the target version, you can find it out by running `osxcross-conf` and then see TARGET.
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You can use the shorting `o32-...` or `i386-apple-darwin...` what ever you like more.
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*I'll continue from now on with `o32-clang`, but remember you can simply replace it with `o32-gcc` or `i386-apple-darwin...`*
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##### Building Makefile based projects: #####
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`make CC=o32-clang CXX=o32-clang++`
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##### Building automake based projects: #####
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`CC=o32-clang CXX=o32-clang++ ./configure --host=i386-apple-darwinXX`
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##### Building test1.cpp and test2.cpp with LTO (Link Time Optimization): #####
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* build the first object file: `o32-clang++ test1.cpp -O3 -flto -c`
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* build the second object file: `o32-clang++ test2.cpp -O3 -flto -c`
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* link them with LTO: `o32-clang++ -O3 -flto test1.o test2.o -o test`
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##### Building a universal binary: #####
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clang:
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`o64-clang++ test.cpp -O3 -arch i386 -arch x86_64 -o test`
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GCC:
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* build the 32 bit binary: `o32-g++ test.cpp -O3 -o test.i386`
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* build the 64 bit binary: `o64-g++ test.cpp -O3 -o test.x86_64`
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* use lipo to generate the universal binary: `x86_64-apple darwinXX-lipo -create test.i386 test.x86_64 -output test`
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### LICENSE: ####
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* bash scripts: GPLv2
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* cctools: APSL 2.0
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* xar: New BSD
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### CREDITS: ####
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* [cjacker for the cctools linux port](https://code.google.com/p/ios-toolchain-based-on-clang-for-linux/source/browse/#svn%2Ftrunk%2Fcctools-porting%2Fpatches)
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