fix(benchmarks): add _POSIX_C_SOURCE to expose CLOCK_MONOTONIC_RAW

tbitcs · oz-agent · tbitcs · commit 7fa3959bec3d · 2026-06-01T18:22:29.000-04:00
-std=c17 without POSIX feature macros doesn't expose CLOCK_MONOTONIC or
CLOCK_MONOTONIC_RAW from &lt;time.h&gt;. Adding _POSIX_C_SOURCE=200809L
enables the POSIX.1-2008 extensions which include these constants.

Co-Authored-By: Oz &lt;oz-agent@warp.dev&gt;
diff --git a/tests/benchmarks/kalman_benchmark/src/main.c b/tests/benchmarks/kalman_benchmark/src/main.c
@@ -19,6 +19,7 @@
  * flag is off, so clock_gettime resolves to glibc and returns real
  * host time with nanosecond resolution.
  */
+#define _POSIX_C_SOURCE 200809L
 #include <time.h>
 static inline uint64_t bench_ns(void)
 {
diff --git a/tests/benchmarks/pid_benchmark/src/main.c b/tests/benchmarks/pid_benchmark/src/main.c
@@ -21,6 +21,7 @@
 #include <arbiter/arbiter.h>
 #include "arbiter_model.h"
 
+#define _POSIX_C_SOURCE 200809L
 #include <time.h>
 static inline uint64_t bench_ns(void)
 {

Original file line number	Diff line number	Diff line change
`@@ -19,6 +19,7 @@`
`19`	`19`	`* flag is off, so clock_gettime resolves to glibc and returns real`
`20`	`20`	`* host time with nanosecond resolution.`
`21`	`21`	`*/`
	`22`	`+#define _POSIX_C_SOURCE 200809L`
`22`	`23`	`#include <time.h>`
`23`	`24`	`static inline uint64_t bench_ns(void)`
`24`	`25`	`{`
Original file line number	Diff line number	Diff line change
`@@ -21,6 +21,7 @@`
`21`	`21`	`#include <arbiter/arbiter.h>`
`22`	`22`	`#include "arbiter_model.h"`
`23`	`23`
	`24`	`+#define _POSIX_C_SOURCE 200809L`
`24`	`25`	`#include <time.h>`
`25`	`26`	`static inline uint64_t bench_ns(void)`
`26`	`27`	`{`