[LLVMdev] Building LLVM and LLVM-GCC4 on Cygwin

[Aaron Gray]

Hello,

Well theres not too much to it. A patch for Cygwin's stdint.h. And a patch for lib/System/Unix/Program.inc.

Despite Cygwin complaining of timing errors both LLVM and LLVM-GCC4 compile ok'ish.

    make[2]: Warning: File `/dev/null' has modification time 0.0096 s in the future
    make[2]: warning:  Clock skew detected.  Your build may be incomplete. 

I am getting this on both XP and Vista and am writting to the Cygwin list regarding this.

In Cygwin's 'include/stdint.h' int32_t and uint32_t have to be changed from long's to int's.

        http://www.aarongray.org/LLVM/Patches/stdint.h.diff

The alternative is to add some disambiguation functions to LLVM, these would be inline and transparent with no overhead.

And 'lib/System/Unix/Program.inc' has to have three lines #def'ed out on the Cygwin build.

        http://www.aarongray.org/LLVM/Patches/Program.inc.diff

This is because Cygwin does not support RLIMIT_RSS.

There are 'make check' results here :-

        http://www.aarongray.org/LLVM/check.txt

The summary :-

  ===  Summary ===

    # of expected passes 1620
    # of unexpected failures         136
    # of unexpected successes         1
    # of expected failures 19

Pritty rag tailed quite a few complaits and it also ended with errors.

There are build instructions here :-

        http://www.aarongray.org/LLVM/BuildingLLVMonCygwin.html

Be aware with these timing errors Cygwin is not a solid development or build platform at present.

Release build coming soon :)

Regards,

Aaron
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