Given the following source:
1: #include <stdio.h>
3: unsigned char *p = NULL;
4: char *s = NULL;
6: unsigned char *p1 = "p";
7: char *s1 = "s";
9: int main() {
10: s = p;
12: char c=255;
13: printf("%d",c);
15: return 0;
}
gcc -Wall _.c -o _ && ./_
produces:
_.c:6: warning: pointer targets in initialization differ in signedness
_.c: In function main:
_.c:10: warning: pointer targets in assignment differ in signedness
-1
gcc -funsigned-char -Wall _.c -o _ && ./_
produces:
_.c:6: warning: pointer targets in initialization differ in signedness
_.c: In function main:
_.c:10: warning: pointer targets in assignment differ in signedness
255
and, finally,
gcc -funsigned-char -Wno-pointer-sign -Wall _.c -o _ && ./_ /_
produces
255
Reported issue:
gcc generates excessive signedness mismatch warning
Expected result:
-funsigned-char must promote "char" to "unsigned char" and not issues the
warnings.
Known workaround:
Use -Wno-pointer-sign.
However, this supporesses warnings for all types, which is rarely
acceptable. Note that the char signedness issue is typically a side effect of
Unicodization of the project from ASCII encodings to UTF-8.
--
Summary: Non-functional -funsigned-char: signed/unsigned mismatch
is reported
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: gcc at brainhub dot org
GCC build triplet: gcc version 4.1.0 20060304 (Red Hat 4.1.0-3) [standard
FC 5]
GCC host triplet: i386-redhat-linux
GCC target triplet: Linux 2.6.16.20 #1 PREEMPT Fri Jun 9 23:10:34 PDT 2006
i686 i686
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28912
