From: Karel Zak <kzak@redhat.com>
Date: Thu, 19 Jan 2017 10:35:24 +0000 (+0100)
Subject: build-sys: use MATH_LIBS for hwclock
X-Git-Tag: v2.29.1~12
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=beceb14b450ded6560ed743634a5e80604a8edf3;p=thirdparty%2Futil-linux.git

build-sys: use MATH_LIBS for hwclock

Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/configure.ac b/configure.ac
index 5c3251186e..f443edbe18 100644
--- a/configure.ac
+++ b/configure.ac
@@ -427,6 +427,12 @@ AC_CHECK_FUNCS([reboot], [have_reboot=yes],[have_reboot=no])
 
 AM_CONDITIONAL([HAVE_OPENAT], [test "x$have_openat" = xyes])
 
+AC_CHECK_FUNCS([isnan], [],
+       [AC_CHECK_LIB([m], [isnan], [MATH_LIBS="-lm"])]
+)
+AC_SUBST([MATH_LIBS])
+
+
 dnl lib/mononotic.c may require -lrt
 AC_CHECK_FUNCS([clock_gettime], [],
 	[AC_CHECK_LIB([rt], [clock_gettime], [REALTIME_LIBS="-lrt"])]
diff --git a/sys-utils/Makemodule.am b/sys-utils/Makemodule.am
index 94003031f3..e98cb5551c 100644
--- a/sys-utils/Makemodule.am
+++ b/sys-utils/Makemodule.am
@@ -408,7 +408,7 @@ hwclock_SOURCES = \
 if LINUX
 hwclock_SOURCES += sys-utils/hwclock-rtc.c
 endif
-hwclock_LDADD = $(LDADD) libcommon.la -lm
+hwclock_LDADD = $(LDADD) libcommon.la $(MATH_LIBS)
 if HAVE_AUDIT
 hwclock_LDADD += -laudit
 endif