build-sys: properly check for -lrt

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

diff --git a/configure.ac b/configure.ac
index f692d8a56a09b001dad37ebb05f02bb3ab43a9c4..1336f8d14491120a6bc5bac2ac118e3e52e6f629 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -346,6 +346,16 @@ AC_FUNC_FSEEKO
 AC_CHECK_FUNCS([openat fstatat unlinkat], [have_openat=yes], [have_openat=no])
 AC_CHECK_FUNCS([ioperm iopl], [have_io=yes])
 
+dnl Old glibc requires -lrt
+AC_CHECK_FUNCS(clock_gettime, [], [
+       AC_CHECK_LIB(rt, clock_gettime, [
+               AC_DEFINE(HAVE_CLOCK_GETTIME, 1)
+               CLOCKGETTIME_LIBS="-lrt"
+       ])
+])
+AC_SUBST([CLOCKGETTIME_LIBS])
+
+
 AC_CHECK_MEMBER([struct sockaddr.sa_len],
                AC_DEFINE_UNQUOTED([HAVE_SA_LEN], [1], [Define if struct sockaddr contains sa_len]), [],
        [#include <sys/types.h>

diff --git a/include/boottime.h b/include/boottime.h
index 3518848fe435f5cdf729b46c4236b2abcaae7625..f1d0d0b277731dedd52e21f3840c1ec11fe4c51d 100644 (file)
--- a/include/boottime.h
+++ b/include/boottime.h
@@ -2,7 +2,7 @@
 #define UTIL_LINUX_BOOTTIME_H
 
 /*
- * Uses clock_gettime() that requires -lrt
+ * Uses clock_gettime() that requires $CLOCKGETTIME_LIBS
  */
 extern int get_boot_time(struct timeval *boot_time);
 

diff --git a/login-utils/Makemodule.am b/login-utils/Makemodule.am
index 6f2e9f067a7c94a70dcf4517376d77eaa6eae899..73fc761d551a11aed24c3fe66960154905637989 100644 (file)
--- a/login-utils/Makemodule.am
+++ b/login-utils/Makemodule.am
@@ -5,7 +5,7 @@ dist_man_MANS += \
        login-utils/last.1 \
        login-utils/lastb.1
 last_SOURCES = login-utils/last.c lib/boottime.c
-last_LDADD = $(LDADD) libcommon.la -lrt
+last_LDADD = $(LDADD) libcommon.la $(CLOCKGETTIME_LIBS)
 
 install-exec-hook-last:
        cd $(DESTDIR)$(usrbin_execdir) && ln -sf last lastb

diff --git a/sys-utils/Makemodule.am b/sys-utils/Makemodule.am
index da601e0670c14c8c1c255f46e3555fb88227e9f5..f540d3834f7f87c33b5db9f40d242e41a997090c 100644 (file)
--- a/sys-utils/Makemodule.am
+++ b/sys-utils/Makemodule.am
@@ -72,7 +72,7 @@ if BUILD_DMESG
 bin_PROGRAMS += dmesg
 dist_man_MANS += sys-utils/dmesg.1
 dmesg_SOURCES = sys-utils/dmesg.c lib/boottime.c
-dmesg_LDADD = $(LDADD) libcommon.la -lrt
+dmesg_LDADD = $(LDADD) libcommon.la $(CLOCKGETTIME_LIBS)
 endif
 
 if BUILD_CTRLALTDEL
@@ -91,7 +91,7 @@ if BUILD_BLKDISCARD
 sbin_PROGRAMS += blkdiscard
 dist_man_MANS += sys-utils/blkdiscard.8
 blkdiscard_SOURCES = sys-utils/blkdiscard.c
-blkdiscard_LDADD = $(LDADD) libcommon.la -lrt
+blkdiscard_LDADD = $(LDADD) libcommon.la $(CLOCKGETTIME_LIBS)
 endif
 
 if BUILD_LDATTACH