[PATCH 2/3] configure.ac: check for clock_gettime and CLOCK_MONOTONIC

[Reuben Hawkins <reubenhwk@gmail.com>]

CLOCK_MONOTONIC isn't available on RHEL3, but there are still RHEL3
systems being used in production.  This change makes compiling git
less tedious on older platforms without CLOCK_MONOTONIC.
---
 Makefile         |  4 ++++
 config.mak.uname |  1 +
 configure.ac     | 22 ++++++++++++++++++++++
 trace.c          |  2 +-
 4 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 7482a4d..af551a0 100644
--- a/Makefile
+++ b/Makefile
@@ -1382,6 +1382,10 @@ ifdef HAVE_CLOCK_GETTIME
 	EXTLIBS += -lrt
 endif
 
+ifdef HAVE_CLOCK_MONOTONIC
+	BASIC_CFLAGS += -DHAVE_CLOCK_MONOTONIC
+endif
+
 ifeq ($(TCLTK_PATH),)
 NO_TCLTK = NoThanks
 endif
diff --git a/config.mak.uname b/config.mak.uname
index a2f380f..926773e 100644
--- a/config.mak.uname
+++ b/config.mak.uname
@@ -35,6 +35,7 @@ ifeq ($(uname_S),Linux)
 	LIBC_CONTAINS_LIBINTL = YesPlease
 	HAVE_DEV_TTY = YesPlease
 	HAVE_CLOCK_GETTIME = YesPlease
+	HAVE_CLOCK_MONOTONIC = YesPlease
 endif
 ifeq ($(uname_S),GNU/kFreeBSD)
 	HAVE_ALLOCA_H = YesPlease
diff --git a/configure.ac b/configure.ac
index dcc4bf0..424dec5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -923,6 +923,28 @@ AC_CHECK_LIB([iconv], [locale_charset],
                      [CHARSET_LIB=-lcharset])])
 GIT_CONF_SUBST([CHARSET_LIB])
 #
+# Define HAVE_CLOCK_GETTIME=YesPlease if clock_gettime is available.
+GIT_CHECK_FUNC(clock_gettime,
+[HAVE_CLOCK_GETTIME=YesPlease],
+[HAVE_CLOCK_GETTIME=])
+GIT_CONF_SUBST([HAVE_CLOCK_GETTIME])
+
+AC_DEFUN([CLOCK_MONOTONIC_SRC], [
+AC_LANG_PROGRAM([[
+#include <time.h>
+clockid_t id = CLOCK_MONOTONIC;
+]], [])])
+
+#
+# Define HAVE_CLOCK_MONOTONIC=YesPlease if CLOCK_MONOTONIC is available.
+AC_MSG_CHECKING([for CLOCK_MONOTONIC])
+AC_COMPILE_IFELSE([CLOCK_MONOTONIC_SRC],
+	[AC_MSG_RESULT([yes])
+	HAVE_CLOCK_MONOTONIC=YesPlease],
+	[AC_MSG_RESULT([no])
+	HAVE_CLOCK_MONOTONIC=])
+GIT_CONF_SUBST([HAVE_CLOCK_MONOTONIC])
+#
 # Define NO_SETITIMER if you don't have setitimer.
 GIT_CHECK_FUNC(setitimer,
 [NO_SETITIMER=],
diff --git a/trace.c b/trace.c
index 4778608..bfbd48f 100644
--- a/trace.c
+++ b/trace.c
@@ -324,7 +324,7 @@ int trace_want(struct trace_key *key)
 	return !!get_trace_fd(key);
 }
 
-#ifdef HAVE_CLOCK_GETTIME
+#if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_CLOCK_MONOTONIC)
 
 static inline uint64_t highres_nanos(void)
 {
-- 
2.2.0.68.g8f72f0c.dirty