Fix signbit detection (#423)

(cherry picked from commit def68746)

Fix signbit detection (#423)
(cherry picked from commit def68746)
baedba07 · Victor Zverovich · Jonathan Müller · b9a20d76 · baedba07
Commit baedba07 authored Nov 14, 2016 by Victor Zverovich Committed by Jonathan Müller Jun 08, 2017
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fmt/format.h fmt/format.h +3 -1

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--- a/fmt/format.h
+++ b/fmt/format.h
@@ -397,8 +397,10 @@ class numeric_limits<fmt::internal::DummyInt> :
  // Portable version of signbit.
  static bool isnegative(double x) {
    using namespace fmt::internal;
-    if (const_check(sizeof(signbit(x)) == sizeof(int)))
+    if (const_check(sizeof(signbit(x)) == sizeof(bool) ||
+                    sizeof(signbit(x)) == sizeof(int))) {
      return signbit(x) != 0;
+    }
    if (x < 0) return true;
    if (!isnotanumber(x)) return false;
    int dec = 0, sign = 0;