[LLVMbugs] [Bug 9138] New: Missing builtins used in gcc 4.4.5 cmath header

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9138

           Summary: Missing builtins used in gcc 4.4.5 cmath header
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++0x
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: jbytheway+llvm at gmail.com
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


Created an attachment (id=6101)
 --> (http://llvm.org/bugs/attachment.cgi?id=6101)
Output from compiling cmath in C++0x mode

When #including the gcc 4.4.5 <cmath> header there are many builtin functions
which clang does not support.  In particular, the following yields the attached
53 errors:

$ clang++ --version
clang version 2.9 (trunk 124897)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$ g++ --version
g++ (Gentoo 4.4.5 p1.0, pie-0.4.5) 4.4.5
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ cat cmath.cpp
#include <cmath>

int main()
{
}

$ clang++ -std=gnu++0x -o cmath cmath.cpp -ferror-limit=100 > compile-output
2>&1

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