configure: Fix log2f misdetection on some systems

Bug report by Dirk Fieldhouse.

configure: Fix log2f misdetection on some systems
Bug report by Dirk Fieldhouse.
d6af8239 · Anton Mitrofanov · Henrik Gramner · b763e338 · d6af8239
Commit d6af8239 authored Nov 08, 2018 by Anton Mitrofanov Committed by Henrik Gramner Dec 23, 2018
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configure configure +1 -1

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--- a/configure
+++ b/configure
@@ -1067,7 +1067,7 @@ if [ "$thread" = "posix" ]; then
 fi
 [ "$thread" != "no" ] && define HAVE_THREAD

-if cc_check 'math.h' '' 'log2f(2);' ; then
+if cc_check 'math.h' '' 'volatile float x = 2; return log2f(x);' ; then
    define HAVE_LOG2F
 fi