Use the autoconf macro John wrote
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9095 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/CBackend/Writer.cpp b/lib/Target/CBackend/Writer.cpp
index 3398124..dea97e9 100644
--- a/lib/Target/CBackend/Writer.cpp
+++ b/lib/Target/CBackend/Writer.cpp
@@ -20,13 +20,10 @@
#include "llvm/Support/Mangler.h"
#include "Support/StringExtras.h"
#include "Support/STLExtras.h"
+#include "Config/config.h"
#include <algorithm>
#include <sstream>
-
-/* FIXME: This should be autoconf'd! */
-#define HAS_C99_HEXADECIMAL_CONSTANTS 1
-
namespace {
class CWriter : public Pass, public InstVisitor<CWriter> {
std::ostream &Out;
@@ -341,7 +338,7 @@
// only deal in IEEE FP).
//
static bool isFPCSafeToPrint(const ConstantFP *CFP) {
-#if HAS_C99_HEXADECIMAL_CONSTANTS
+#if HAVE_PRINTF_A
char Buffer[100];
sprintf(Buffer, "%a", CFP->getValue());
@@ -457,7 +454,7 @@
Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
<< "*)&FPConstant" << I->second << ")";
} else {
-#if HAS_C99_HEXADECIMAL_CONSTANTS
+#if HAVE_PRINTF_A
// Print out the constant as a floating point number.
char Buffer[100];
sprintf(Buffer, "%a", FPC->getValue());