X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=src%2Fs%2Faix4.h;h=56bd1a1128ee56b9e6658bd48745dab8fed7c1c1;hb=515ed47192a2fc212474dc246a875771890e0cbe;hp=bb3a15d78c1611fe2c787fde05d0565cca4a714e;hpb=a7bf8d60d66c38f62928b171842d1b45d4539077;p=chise%2Fxemacs-chise.git.1

diff --git a/src/s/aix4.h b/src/s/aix4.h
index bb3a15d..56bd1a1 100644
--- a/src/s/aix4.h
+++ b/src/s/aix4.h
@@ -11,18 +11,28 @@
 /* AIX is happier when bzero and strcasecmp are declared */
 #include "strings.h"
 
-/* AIX 4.2's sys/mman.h doesn't seem to define MAP_FAILED,
-   although Unix98 claims it must. */
-#ifdef HAVE_MMAP
-#include <sys/mman.h>
-# ifndef MAP_FAILED
-#  define MAP_FAILED ((void *) -1)
-# endif
-#endif
-
 /* Forward declarations for xlc warning suppressions */
 struct ether_addr;
 struct sockaddr_dl;
+
+#ifdef __xlC__			/* "eXceLlent C compiler" ?! */
+#if __xlC__ >= 1200
+/* IBM's C compiler option `-O3' is too aggressive.
+   We recommend instead the combination `-O3 -qstrict', which seems safe.
+
+   cc -O3 miscompiles at least two functions.  From IBM's docs:
+
+   IBM> -qstrict turns off the following optimizations:
+
+   IBM> Performing code motion and scheduling on computations such as loads
+   IBM> and floating-point computations that may trigger an exception.
+
+   Nevertheless, we try to work with these compiler options. */
+#pragma option_override (bytecount_to_charcount, "opt(strict,yes)")
+#pragma option_override (Fexpand_file_name, "opt(strict,yes)")
+#endif /* recent IBM C compiler */
+#endif /* IBM's C compiler */
+
 #endif /* C code */
 
 /* getaddrinfo is broken in AIX 4.3 as per IY04165.