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775fb0f0f1
libDtHelp is unable to read SDL help files
with -ftree-store-ccp optimization which
is enabled by -O2 on gcc 4.2.1.
GifUtils.c and decompress.c didn't work
properly with -ftree-store-ccp enabled.
GifUtils.c was repaired by fixing
those warnings:
GifUtils.c: In function 'create_pixmap':
GifUtils.c:1093: warning: return makes integer from pointer without a cast
GifUtils.c:1110: warning: return makes integer from pointer without a cast
GifUtils.c:1215: warning: return makes integer from pointer without a cast
GifUtils.c: In function 'gif_to_pixmap':
GifUtils.c:1242: warning: return makes integer from pointer without a cast
decompress.c didn't generate warnings, but the
only effect of the -ftree-store-cpp was to introduce
this change:
addq $1, %rax
movq %rax, (%rbx)
.L90:
- cmpl $157, %edx
+ cmpl $-99, %edx
jne .L86
movl 8(%rbx), %eax
subl $1, %eax
Which corresponds to this source code:
bufioI.h
57 #define BufFileGet(f) ((f)->left-- ? *(f)->bufp++ : (*(f)->io) (f))
42 int (*io)(/* BufFilePtr f */);
decompress.c
53 #ifdef NO_UCHAR
54 typedef char char_type;
55 #else
56 typedef unsigned char char_type;
57 #endif /* UCHAR */
58
59 static char_type magic_header[] = { "\037\235" }; /* 1F 9D */
131 if ((BufFileGet(f) != (magic_header[0] & 0xFF)) ||
132 (BufFileGet(f) != (magic_header[1] & 0xFF)))
133 {
134 return 0;
135 }
BufFileGet() returns (int), so the (unsigned char) constants
got promoted to (int) with sign extension; therefore constant
157 decimal (0x9D) became -99 decimal, sign extended
(0xffffff9D), and the comparison was always false.
Tested using:
$ gcc -v
Using built-in specs.
Target: amd64-undermydesk-freebsd
Configured with: FreeBSD/amd64 system compiler
Thread model: posix
gcc version 4.2.1 20070831 patched [FreeBSD]
Running on:
FreeBSD 10.0-CURRENT (r240948M)
built Wed Sep 26 23:33:08 CEST 2012
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************************************* The Common Desktop Environment is released under the terms of the LGPL V.2 license. You may reuse and redistribute this code under the terms of this license. See the COPYING file for details. ************************************* Purpose of this release: This release of CDE under a new opensource license is numbered starting at version 2.2.0. ************************************ Downloading this release: CDE may be downloaded in source form from the Common Desktop Environment website: http://sourceforge.net/projects/cdesktopenv/ Or via git: git clone git://git.code.sf.net/p/cdesktopenv/code cdesktopenv-code The git repository will always be more up to date than the downloadable tarballs we make available, so if you have problems, please try the latest version from git master. ************************************ Installing this release: Complete build and installation instructions can be found on the CDE wiki: http://sourceforge.net/p/cdesktopenv/wiki/Home/ Please go there and read the appropriate section(s) for your OS (Linux or FreeBSD/OpenBSD/NetBSD currently). There are a variety of dependancies that must be met, as well as specific set up steps required to build. Do not expect to just type 'make' and have it actually work without meeting the prerequisites and following the correct steps as spelled out on the wiki. :) There are also a lot of other documents and information there that you might find useful. ************************************ Support: You can join the development mailing list here: https://lists.sourceforge.net/lists/listinfo/cdesktopenv-devel There is a CDE IRC channel on chat.freenode.net, channel #cde Bug reports and patches encouraged.