struct-ret-3.c: Include unistd.h.

	* gcc.dg/struct-ret-3.c: Include unistd.h.
	(main): Exit early if system memory page size is
	larger than 4096 bytes.

From-SVN: r143056

gcc/testsuite/ChangeLog

+2009-01-04  Uros Bizjak  <ubizjak@gmail.com>
+
+	* gcc.dg/struct-ret-3.c: Include unistd.h.
+	(main): Exit early if system memory page size is
+	larger than 4096 bytes.
+
 2009-01-04  Daniel Franke  <franke.daniel@gmail.com>
 
 	PR fortran/38718

gcc/testsuite/gcc.dg/struct-ret-3.c

@@ -7,6 +7,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <errno.h>
+#include <unistd.h>
 
 unsigned long ossAlignX(unsigned long i, unsigned long X)
 {
@@ -69,6 +70,11 @@ int main(void)
 
    char buf[sizeof(struct stuff)+4096];
    struct stuff *u = (struct stuff *)ossAlignX((unsigned long)&buf[0], 4096);
+
+   /* This test assumes system memory page size of 4096 bytes or less.  */
+   if (sysconf(_SC_PAGESIZE) > 4096)
+     return 0;
+
    memset(u, 1, sizeof(struct stuff));
    u->c1[0] = '\xAA';
    u->c2[0] = '\xBB';