Use 'timer_getoverrun' on Cygwin when possible

* configure.ac: Add a check for the 'timer_getoverrun' function.

* src/profiler.c [CYGWIN] : Define 'timer_getoverrun' as a
macro only on versions of Cygwin where it is not already
defined as a function.

2 files changed, 5 insertions, 4 deletions

diff --git a/configure.ac b/configure.ac
index 58579008f3a..c26eb6d1e89 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4126,7 +4126,7 @@ getrusage get_current_dir_name \
 lrand48 random rint trunc \
 select getpagesize setlocale newlocale \
 getrlimit setrlimit shutdown \
-pthread_sigmask strsignal setitimer \
+pthread_sigmask strsignal setitimer timer_getoverrun \
 sendto recvfrom getsockname getifaddrs freeifaddrs \
 gai_strerror sync \
 getpwent endpwent getgrent endgrent \
diff --git a/src/profiler.c b/src/profiler.c
index 15a0eef0d3e..293e52633a8 100644
--- a/src/profiler.c
+++ b/src/profiler.c
@@ -232,9 +232,10 @@ static EMACS_INT current_sampling_interval;
 
 /* Signal handler for sampling profiler.  */
 
-/* timer_getoverrun is not implemented on Cygwin, but the following
-   seems to be good enough for profiling. */
-#ifdef CYGWIN
+/* timer_getoverrun is not implemented on Cygwin prior to
+   cygwin-3.0.0, but the following seems to be good enough for
+   profiling. */
+#if defined CYGWIN && !defined HAVE_TIMER_GETOVERRUN
 #define timer_getoverrun(x) 0
 #endif