Package: libgd2-noxpm-dev
Version: 2.0.33-1.1
Severity: normal
At the moment, the gcc will issue a warning when using gdImageStringFT()
with const strings. I discovered this while compiling mapserver with
lots of warning flags.
The declaration in /usr/include/gd.h currently look like this:
/* FreeType 2 text output */
BGD_DECLARE(char *) gdImageStringFT (gdImage * im, int *brect, int fg,
char *fontlist, double ptsize, double angle, int x,
int y, char *string);
The problem is the use of 'char *' instead of 'const char *'. This
example program demonstrate the problem. As far as I can see, the
code do not write to the strings, so it should be safe to convert the
function to use 'const char *'.
Here is an example program demonstrating the issue. The program is
not supposed to run (the other arguments are bogus. :) Compile with
gcc -Wall to see the warnings:
/*
* Demonstrate the following warning in gd.h:
x.c: In function `main':
x.c:5: warning: passing arg 4 of `gdImageStringFT' discards qualifiers from
pointer target type
x.c:5: warning: passing arg 9 of `gdImageStringFT' discards qualifiers from
pointer target type
*/
#include <gd.h>
const char fontlist[] = "font";
const char string[] = "hello world";
int main(int argc, char *argv[]) {
const char *fontlist = "font";
char *s = gdImageStringFT (NULL, NULL, 0, fontlist, 0.0, 0.0, 0, 0, string);
return s ? 0 : 1;
}
-- System Information:
Debian Release: 3.1
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.4.26-1-686
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages libgd2-noxpm-dev depends on:
ii libc6-dev 2.3.2.ds1-20 GNU C Library: Development Librari
ii libfreetype6-dev 2.1.7-2.3 FreeType 2 font engine, developmen
ii libgd2-noxpm 2.0.33-1.1 GD Graphics Library version 2 (wit
ii libjpeg62-dev 6b-9 Development files for the IJG JPEG
ii libpng12-dev [libpng12-0-de 1.2.8rel-1 PNG library - development
ii zlib1g-dev 1:1.2.2-4 compression library - development
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