* Fix compilation on AIX: GCC's fixincludes eliminates isinf() declaration

* Move file comment to the top of the header where it belongs

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17349 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Support/IsInf.cpp b/lib/Support/IsInf.cpp
index 7087dd94c1421a617ef47b24cf95a4b7ecec9e9d..e2943b05b58ddabeb313e1dcc6885e0da9914f97 100644 (file)
--- a/lib/Support/IsInf.cpp
+++ b/lib/Support/IsInf.cpp
@@ -1,4 +1,4 @@
-//===-- IsInf.cpp ---------------------------------------------------------===//
+//===-- IsInf.cpp - Platform-independent wrapper around C99 isinf() -------===//
 // 
 //                     The LLVM Compiler Infrastructure
 //
@@ -6,12 +6,9 @@
 // the University of Illinois Open Source License. See LICENSE.TXT for details.
 // 
 //===----------------------------------------------------------------------===//
-//
-// Platform-independent wrapper around C99 isinf(). 
-//
-//===----------------------------------------------------------------------===//
 
 #include "llvm/Config/config.h"
+
 #if HAVE_ISINF_IN_MATH_H
 # include <math.h>
 #elif HAVE_ISINF_IN_CMATH
@@ -27,6 +24,11 @@ static int isinf(double x) { return !finite(x) && x==x; }
 #elif defined(_MSC_VER)
 #include <float.h>
 #define isinf(X) (!_finite(X))
+#elif defined(_AIX) && defined(__GNUC__)
+// GCC's fixincludes seems to be removing the isinf() declaration from the
+// system header /usr/include/math.h 
+# include <math.h>
+static int isinf(double x) { return !finite(x) && x==x; }
 #else
 # error "Don't know how to get isinf()"
 #endif