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How can I build a cross-compiler for a C++ library to target many platforms on a single build server?
The cross-compiler should be able to build the library for (at least) {Windows 7, Mac OS X, Ubuntu 11.04} × {32 bit, 64 bit} × {Debug, Release}. I don't care if the whole build from scratch takes forever or if the gcc binary is 1 GB. If the cross-compiler cannot be a single executable, what is the workflow I should use to compile (and recompile) my library?
The host machine would be a Ubuntu 11.04.
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Build supports cross compilation with the gcc and msvc toolsets. For the complete list of allowed opeating system names, please see the documentation for target-os feature. When using the msvc compiler, it's only possible to cross-compiler to a 64-bit system on a 32-bit host.
A cross compiler is a compiler capable of creating executable code for a platform other than the one on which the compiler is running. For example, a compiler that runs on a PC but generates code that runs on an Android smartphone is a cross compiler.
The language C itself is cross-platform, because you don't directly run C code on machines. The C source code is compiled to assembly, and assembly is the platform specific code. The only non cross-platform part are the compilers and the resulting assembly.
Explanation: GCC, a free software collection of compilers, also can be used as cross compile. It supports many languages and platforms.
Building cross-compiler is quite well covered in OSDev Wiki. For Windows, you can use mingw packages in your distro's repository
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