[PATCH] hwclock: Check for SYS_settimeofday before calling syscall

[Khem Raj]

Some newer architectures e.g. RISCV32 have 64bit time_t from get go and
thusly do not have gettimeofday_time64/settimeofday_time64 implemented
therefore check for SYS_settimeofday definition before making the
syscall. Fixes build for riscv32 and it will bail out at runtime.

Signed-off-by: Khem Raj <raj.khem at gmail.com>
---
 util-linux/hwclock.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c
index 723b09589..b9faaabbc 100644
--- a/util-linux/hwclock.c
+++ b/util-linux/hwclock.c
@@ -131,6 +131,7 @@ static void show_clock(const char **pp_rtcname, int utc)
 
 static void set_kernel_tz(const struct timezone *tz)
 {
+	int ret = 1;
 #if LIBC_IS_MUSL
 	/* musl libc does not pass tz argument to syscall
 	 * because "it's deprecated by POSIX, therefore it's fine
@@ -139,9 +140,11 @@ static void set_kernel_tz(const struct timezone *tz)
 #if !defined(SYS_settimeofday) && defined(SYS_settimeofday_time32)
 # define SYS_settimeofday SYS_settimeofday_time32
 #endif
-	int ret = syscall(SYS_settimeofday, NULL, tz);
+#if defined(SYS_settimeofday)
+	ret = syscall(SYS_settimeofday, NULL, tz);
+#endif
 #else
-	int ret = settimeofday(NULL, tz);
+	ret = settimeofday(NULL, tz);
 #endif
 	if (ret)
 		bb_simple_perror_msg_and_die("settimeofday");
-- 
2.30.1