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Remove old fenv.h workaround for a historic clang driver bug 

Tested and works fine with clang using libstdc++.

All indications are that this was fixed some time ago and isn't a problem with
any clang version we support.

I've added a note in PR6907 which is still open for some reason.

llvm-svn: 210485
This commit is contained in:
Alp Toker 2014-06-09 19:00:52 +00:00
parent cd95922bd1
commit 51420a8d62
1 changed files with 2 additions and 9 deletions
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11
llvm/lib/Analysis/ConstantFolding.cpp
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@ -39,13 +39,6 @@
#ifdef HAVE_FENV_H
#include <fenv.h>
#define USE_FENV
#endif
// FIXME: Clang's #include handling apparently doesn't work for libstdc++'s
// fenv.h; see PR6907 for details.
#if defined(__clang__) && defined(_GLIBCXX_FENV_H)
#undef USE_FENV
#endif
using namespace llvm;
@ -1329,7 +1322,7 @@ static Constant *GetConstantFoldFPValue(double V, Type *Ty) {
namespace {
/// llvm_fenv_clearexcept - Clear the floating-point exception state.
static inline void llvm_fenv_clearexcept() {
#if defined(USE_FENV) && HAVE_DECL_FE_ALL_EXCEPT
#if defined(HAVE_FENV_H) && HAVE_DECL_FE_ALL_EXCEPT
feclearexcept(FE_ALL_EXCEPT);
#endif
errno = 0;
@ -1340,7 +1333,7 @@ static inline bool llvm_fenv_testexcept() {
int errno_val = errno;
if (errno_val == ERANGE || errno_val == EDOM)
return true;
#if defined(USE_FENV) && HAVE_DECL_FE_ALL_EXCEPT && HAVE_DECL_FE_INEXACT
#if defined(HAVE_FENV_H) && HAVE_DECL_FE_ALL_EXCEPT && HAVE_DECL_FE_INEXACT
if (fetestexcept(FE_ALL_EXCEPT & ~FE_INEXACT))
return true;
#endif