Attachment 140311 Details for Bug 186848 – file.shar

file.shar

file.shar (text/plain), 1.38 KB, created by David Hines on 2014-02-17 17:50:00 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: David Hines

Created: 2014-02-17 17:50:00 UTC

Size: 1.38 KB

patch

obsolete

># This is a shell archive.  Save it in a file, remove anything before
># this line, and then unpack it by entering "sh file".  Note, it may
># create directories; files and directories will be owned by you and
># have default permissions.
>#
># This archive contains:
>#
>#	clang_bug.c
>#
>echo x - clang_bug.c
>sed 's/^X//' >clang_bug.c << '7cdc9fc910e8be01c1758f1d1bf4e799'
>X#include <stdio.h>
>X
>X/*
>X * This demonstrates a bug in the code generation of the C compiler
>X * distributed as part of FreeBSD 10.0 on i386 when using optimisation.
>X *
>X * To identify the affected system:
>X * Output from uname -ap:
>X *	FreeBSD free100 10.0-RELEASE FreeBSD 10.0-RELEASE #0 r260789:
>X *	Fri Jan 17 01:46:25 UTC 2014
>X *	root@snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC i386 i386
>X * Output from cc -v:
>X *	FreeBSD clang version 3.3 (tags/RELEASE_33/final 183502) 20130610
>X *	Target: i386-unknown-freebsd10.0
>X *	Thread model: posix
>X *
>X * When this is compiled without optimisation the output is correct.
>X *	cc -o clang_bug clang_bug.c; ./clang_bug
>X *	An int has 32 bits
>X *
>X * With optimisation it is incorrect.
>X *	cc -O -o clang_bug-O clang_bug.c; ./clang_bug-O
>X *	An int has 33 bits
>X */
>X
>Xunion
>X{
>X    int i;
>X} u;
>X
>X
>Xint
>Xmain(int argc, char *argv[])
>X{
>X    int j = 1;
>X
>X    for (u.i = 1;  u.i += u.i;  ++j)
>X	;
>X    printf("An int has %d bits\n", j);
>X
>X    return 0;
>X}
>7cdc9fc910e8be01c1758f1d1bf4e799
>exit

Actions: View

Attachments on bug 186848: 140311