[LLVMbugs] [Bug 18940] New: llvm/support/MathExtras.h compile error when compiling with strict #if variable defined checking

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18940

            Bug ID: 18940
           Summary: llvm/support/MathExtras.h compile error when compiling
                    with strict #if variable defined checking
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Support Libraries
          Assignee: unassignedbugs at nondot.org
          Reporter: morten.brodersen at contecint.com.au
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Note: This is a bug for LLVM 3.4 not trunk. 3.4 can not be selected in the
bugzilla version widget.

llvm/support/MathExtras.h use the following pattern:

#if _MSC_VER

instead of (for example)

#if (defined(_MSC_VER) && _MSC_VER)

resulting in MathExtras.h not compiling with strict "preprocessor variables are
defined" checking.

Changing:

#if _MSC_VER

to:

#if (defined(_MSC_VER) && _MSC_VER)

fixes the problem.

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