util/Math: change define

This has nothing to do with uClibc. It has everything to do with gcc's libstdc++. C99 math can be compile time disabled for it. Check for that and use boost lround when std is not available. Signed-off-by: Rosen Penev <rosenp@gmail.com>

util/Math: change define
cfa4524c · Rosen Penev · Max Kellermann · 4fd0c84f · cfa4524c
Commit cfa4524c authored Mar 24, 2020 by Rosen Penev Committed by Max Kellermann Mar 25, 2020
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Math.hxx src/util/Math.hxx +5 -1

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--- a/src/util/Math.hxx
+++ b/src/util/Math.hxx
@@ -30,7 +30,11 @@
 #ifndef MATH_HXX
 #define MATH_HXX
-#ifdef __UCLIBC__
+/*
+ * C99 math can be optionally omitted with gcc's libstdc++.
+ * Use boost if unavailable.
+ */
+#if (defined(__GLIBCPP__) || defined(__GLIBCXX__)) && !defined(_GLIBCXX_USE_C99_MATH)
 #include <boost/math/special_functions/round.hpp>
 using boost::math::lround;
 #else