[LLVMbugs] [Bug 9436] Build from trunk fails in lib/Analysis on cygwin

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Mar 9 18:05:04 PST 2011


NAKAMURA Takumi <geek4civic at gmail.com> changed:

           What    |Removed                     |Added
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |INVALID

--- Comment #12 from NAKAMURA Takumi <geek4civic at gmail.com> 2011-03-09 20:05:04 CST ---
(In reply to comment #10)
> The /usr/include ones #define it, and the llvm one uses it. The non-tr1 (which
> is the one picked up the the compile according to ConstantFolding.i) does
> # include_next <fenv.h>
> #endif
> I assume it's intended to pick up /usr/include/fenv.h, but _GLIBCXX_HAVE_FENV_H
> is false, so it never gets there. Changing
> /usr/lib/gcc/i686-pc-cygwin/4.3.4/include/c++/i686-pc-cygwin/bits/c++config.h
> to have
> #define _GLIBCXX_HAVE_FENV_H 1
> makes the build continue. Maybe Cygwin added their fenv.h without updating
> c++config.h?

Yeah, I assume it is cygwin's bug. And I guess you can work around.
I will add this to release notes if it would not be fixed within a few weeks.

  - Downgrade cygwin.
  - Tweak c++config.h.
  - Upgrade cygwin's g++-4.

Thank you to report it to cygwin!

ps. to tweak c++config.h, has llvm been built with fenv?

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