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changeset 499:36b504cdc45f

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[xemacs-hg @ 2001-05-03 07:17:11 by martinb] Fix crash with xlc -O3.
author martinb
date Thu, 03 May 2001 07:17:11 +0000
parents 88e7e9bafe19
children cc01aa5e5784
files src/s/aix4.h
diffstat 1 files changed, 10 insertions(+), 5 deletions(-) [+]
line wrap: on
line diff
--- a/src/s/aix4.h	Wed May 02 16:08:11 2001 +0000
+++ b/src/s/aix4.h	Thu May 03 07:17:11 2001 +0000
@@ -17,14 +17,19 @@
 
 #ifdef __xlC__			/* "eXceLlent C compiler" ?! */
 #if __xlC__ >= 1200
-/* IBM's C compiler miscompiles bytecount_to_charcount at high levels
-   of optimization.  From IBM's docs:
+/* 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:
 
-   -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.
 
-   Performing code motion and scheduling on computations such as loads
-   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 */