apenwarr-redo/redoconf/rc/libm.rc.od

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. ./redoconf.rc
rc_include rc/CC.rc rc/pkg-config.rc
prog='
#include <math.h>
int x = FP_NORMAL;
volatile float y;
void f() { y = sin(y); }
'
rc_pkg_detect LIBM libm \
rc_compile cc link "$prog"
if [ -z "$HAVE_LIBM" ]; then
rc_undo
rc_replaceln HAVE_LIBM 1
rc_appendln LIBM "-lm"
appendln LIBS "$LIBM"
if ! rc_compile cc link "$prog"; then
rc_undo
rc_replaceln HAVE_LIBM ""
rc_replaceln LIBM ""
fi
fi
rc_save