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[gpsd-dev] [PATCH] Fix a compiler warning when compiling with clang.

From: Beat Bolli
Subject: [gpsd-dev] [PATCH] Fix a compiler warning when compiling with clang.
Date: Thu, 3 May 2012 23:14:03 +0200

I tried to compile GPSd with clang from the LLVM project.

This was the command line: CC=clang scons nmea2000=false

I had to exclude the NMEA2000 driver because <time.h> on Ubuntu 12.04
(Precise Pangolin) doesn't define clock_gettime().

This was the only warning:

clang -o gpxlogger.o -c -O2 gpxlogger.c
gpxlogger.c:338:5: warning: expression result unused [-Wunused-value]
    (int)gps_mainloop(&gpsdata, 5000000, conditionally_log_fix);
    ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Everything else compiled fine. "CC=clang scons check" passes.
 gpxlogger.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gpxlogger.c b/gpxlogger.c
index 6f4ae4c..eff63ef 100644
--- a/gpxlogger.c
+++ b/gpxlogger.c
@@ -335,7 +335,7 @@ int main(int argc, char **argv)
     (void)gps_stream(&gpsdata, flags, source.device);
-    (int)gps_mainloop(&gpsdata, 5000000, conditionally_log_fix);
+    (void)gps_mainloop(&gpsdata, 5000000, conditionally_log_fix);

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