Fix pthread_kill_test flake on qemu

libc/stdio/fleaks.c

@@ -17,6 +17,7 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
+#include "libc/dce.h"
 #include "libc/errno.h"
 #include "libc/fmt/itoa.h"
 #include "libc/runtime/runtime.h"
@@ -31,6 +32,8 @@ void CheckForFileLeaks(void) {
   char *p = msg;
   char *pe = msg + 256;
   bool gotsome = false;
+  if (IsQemuUser())
+    usleep(1);  // weird qemu mt flake
   for (int fd = 3; fd < MIN_CLANDESTINE_FD; ++fd) {
     if (fcntl(fd, F_GETFL) != -1) {
       if (!gotsome) {

test/libc/thread/footek_test.c

@@ -14,22 +14,22 @@
 // with futexes
 // 30 threads / 100000 iterations
 //
-//           54,183 us real
-//           84,723 us user
-//          741,667 us sys
-// footek_test on studio.test.          609 µs   14'106 µs      65'607 µs
-//          406,588 us real
-//          884,696 us user
-//          720,567 us sys
-// footek_test on pi5.test.             334 µs   13'398 µs     408'450 µs
-//        1,253,808 us real
-//        3,608,426 us user
-//        1,378,765 us sys
-// footek_test on freebsdarm.test.      367 µs   16'466 µs   1'287'915 µs
-//        1,316,058 us real
-//        3,286,528 us user
-//        1,738,756 us sys
-// footek_test on pi.test.              450 µs   16'787 µs   1'338'420 µs
+//           46,481 us real
+//           68,745 us user
+//          586,871 us sys
+// footek_test on studio.test.          585 µs   13'597 µs      57'473 µs
+//          389,619 us real
+//          839,848 us user
+//          679,112 us sys
+// footek_test on pi5.test.             335 µs   13'034 µs     432'358 µs
+//          463,799 us real
+//        1,259,267 us user
+//          547,681 us sys
+// footek_test on pi.test.              479 µs   16'539 µs     476'395 µs
+//        1,256,134 us real
+//        3,770,473 us user
+//        1,214,755 us sys
+// footek_test on freebsdarm.test.      364 µs   16'898 µs   1'288'594 µs
 
 // arm fleet
 // without futexes

tool/emacs/cosmo-cpp-constants.el

@@ -73,6 +73,7 @@
     "__BMI2__"
     "__FMA__"
     "__FAST_MATH__"
+    "__FINITE_MATH_ONLY__"
     "__ROUNDING_MATH__"
     "__NO_MATH_ERRNO__"
     "__FMA4__"