HP-UX system headers make a mess of isinf(), so much so that gcc fixincludes
can't patch it up for c++ (works in C though)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22079 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/IsInf.cpp b/lib/Support/IsInf.cpp
index 070ed4f..5160110 100644
--- a/lib/Support/IsInf.cpp
+++ b/lib/Support/IsInf.cpp
@@ -29,6 +29,10 @@
// system header /usr/include/math.h
# include <math.h>
static int isinf(double x) { return !finite(x) && x==x; }
+#elif defined(__hpux)
+// HP-UX is "special"
+#include <math.h>
+static int isinf(double x) { return ((x)==INFINITY)||((x)==-INFINITY); }
#else
# error "Don't know how to get isinf()"
#endif