regression test for musl built with broken gcc-4.9 bug #61144

diff --git a/src/regression/fflush-exit.c b/src/regression/fflush-exit.c
new file mode 100644 (file)
index 0000000..967f6af
--- /dev/null
+++ b/src/regression/fflush-exit.c
@@ -0,0 +1,38 @@
+// gcc 4.9.0 introduced an invalid optimization for local weak alias symbols
+// which drops stdout fflush from exit in musl
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61144
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include "test.h"
+
+#define ASSERT(c) do { \
+       errno = 0; \
+       if (!(c)) \
+               t_error("%s failed (errno: %s)\n", #c, strerror(errno)); \
+} while(0)
+
+int main(void)
+{
+       char tmp[] = "/tmp/testsuite-XXXXXX";
+       int fd, pid, status;
+       char c;
+
+       ASSERT((fd = mkstemp(tmp)) > 2);
+       ASSERT((pid = fork()) >= 0);
+       if (pid == 0) {
+               ASSERT(close(1) == 0);
+               ASSERT(dup(fd) == 1);
+               ASSERT(fwrite("x", 1, 1, stdout) == 1);
+               exit(t_status);
+       }
+       ASSERT(waitpid(pid, &status, 0) == pid);
+       ASSERT(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+       ASSERT(pread(fd, &c, 1, 0) == 1);
+       ASSERT(c == 'x');
+       ASSERT(unlink(tmp) == 0);
+       return t_status;
+}