[LLVMbugs] [Bug 12160] New: clang -O2 implies -fno-math-errno but doesn't set math_errhandling properly

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12160

             Bug #: 12160
           Summary: clang -O2 implies -fno-math-errno but doesn't set
                    math_errhandling properly
           Product: clang
           Version: 3.0
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: jay.foad at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8132
  --> http://llvm.org/bugs/attachment.cgi?id=8132
test case

(I've split this specific issue out from PR11858.)

With the attached test case I get:

$ clang -O2 -o sq sq.c -lm && ./sq
fail

... because clang -O2 implies -fno-math-errno which disables proper errno
handling for math functions, but math_errhandling still has the MATH_ERRNO bit
set.

I'm using svn trunk r151520 on Ubuntu 11.10 x86_64.

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