[LLVMbugs] [Bug 18008] New: feraiseexcept is stripped out of C++ programs

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18008

            Bug ID: 18008
           Summary: feraiseexcept is stripped out of C++ programs
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tjablin at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

feraiseexcept is stripped out of C++ (but not C programs). Here is a simple
test case:

echo -e "#include <fenv.h>\\n void foo(void) { feraiseexcept(1); }" | clang -x
c++ -emit-llvm -S -o - - -O2

The underlying problem is that clang is resolving renamed symbols in the wrong
way. fenv.h says:

  int feraiseexcept_renamed(void) __asm__ ("" "feraiseexcept");

  extern inline int feraiseexcept(void) {
    ...
    return feraiseexcept_renamed();
  }

In gcc, the call to feraiseexcept_renamed resolves to the external version of
feraiseexcept. In clang, the call to feraiseexcept_renamed resolves to the
inlined version.

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