[Bug c/28437] New: multiple fno-builtin-* flags broken
If more than one -fno-builtin-* flag is specified, the first one is ignored. I've seen other reports of this on Wine the mailing lists. We use -fno-builtin to supress the gcc builtins that are incompatible with msvcrt's string functions. [EMAIL PROTECTED]:~/wine$ cat b.c int iswalpha(unsigned short); [EMAIL PROTECTED]:~/wine$ gcc -fno-builtin-iswalpha -c b.c [EMAIL PROTECTED]:~/wine$ gcc -fno-builtin-iswalpha -fno-builtin-iswalnum -c b.c b.c:1: warning: conflicting types for built-in function iswalpha [EMAIL PROTECTED]:~/wine$ gcc -v Using built-in specs. Target: x86_64-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,ada,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --enable-checking=release x86_64-linux-gnu Thread model: posix gcc version 4.1.2 20060715 (prerelease) (Debian 4.1.1-9) [EMAIL PROTECTED]:~/wine$ uname -a Linux black 2.6.16.11 #1 Mon May 1 16:44:30 KST 2006 x86_64 GNU/Linux -- Summary: multiple fno-builtin-* flags broken Product: gcc Version: 4.1.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: mike at codeweavers dot com GCC build triplet: x86_64-linux-gnu GCC host triplet: x86_64-linux-gnu GCC target triplet: x86_64-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28437
[Bug c/23805] New: No warning for uninitialized variable.
-- Summary: No warning for uninitialized variable. Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: mike at codeweavers dot com CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23805
[Bug c/23805] No warning for uninitialized variable.
--- Additional Comments From mike at codeweavers dot com 2005-09-10 02:04
---
char *foo(char **x) { if(*x) return x[0]; return 0; }
char *bar(void) { char *x, *y = 0; if(x) y = foo(&x); return y; }
/usr/local/gcc-4.0.1/bin/gcc -Wall -O2 -Wuninitialized -c tg.c
Give no warnings at all, even though x is used without initialization.
bash-3.00$ /usr/local/gcc-4.0.1/bin/gcc -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.0.1/configure --prefix=/usr/local/gcc-4.0.1
--with-gnu-ld=/usr/local/binutils-2.16.1/bin/ld
--with-gnu-as=/usr/local/binutils-2.16.1/bin/as
Thread model: posix
gcc version 4.0.1
bash-3.00$ uname -a
Linux black 2.6.13 #4 Mon Aug 29 12:35:27 KST 2005 i686 unknown unknown
GNU/Linux
Slackware current, built gcc 4.0 myself to check gcc 4.0 warnings in Wine.
--
What|Removed |Added
Version|4.1.0 |4.0.1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23805
[Bug middle-end/19430] Missing uninitialized warning
--- Additional Comments From mike at codeweavers dot com 2005-09-10 08:07
---
Simplifying things a bit:
void foo(int*);
void bar(void) { int x; if(x) foo(&x); }
gcc -c foo.c -Wall -O2 -Wuninitialized
(More stunning silence.)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19430
[Bug c/25955] New: regression: value computed not used warning with cast return value
bash-3.00$ cat z1.c
int foo(void);
void bar(void) { (unsigned int)foo(); }
bash-3.00$ vi z1.c
bash-3.00$ /usr/local/gcc-4.1-branch/bin/gcc -c z1.c -Wall -O2
z1.c: In function bar:
z1.c:1: warning: value computed is not used
bash-3.00$ /usr/local/gcc-4.1-branch/bin/gcc -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/usr/local/gcc-4.1-branch
--with-gnu-ld=/usr/local/binutils-2.16.1/bin/ld
--with-gnu-as=/usr/local/binutils-2.16.1/bin/as
Thread model: posix
gcc version 4.1.0 20060118 (prerelease)
Background:
Wine's windowsx.h defines:
#define ListBox_SetCurSel(hwndCtl, index) \
((int)SendMessage((hwndCtl), LB_SETCURSEL, (WPARAM)(int)(index), 0L))
Using this macro will give a warning in the gcc 4.1 branch, but not with gcc
4.0.2. Though the warning is technically correct, it doesn't really make much
sense, and I can't think of a real problem it's going to catch.
--
Summary: regression: value computed not used warning with cast
return value
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: mike at codeweavers dot com
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i486-slackware-linux
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25955
[Bug middle-end/24900] [4.1 Regression] new "value computed is not used" warning in gcc 4.1
--- Comment #11 from mike at codeweavers dot com 2006-01-26 03:02 --- Unfortunately statement expressions don't look like portable C. The (windowsx.h) macros we use in Wine are Windows macros and can't be changed. To get rid of these warnings it's likely we'll have to turn off the computed value not used warning, which used to show some useful warnings... -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24900
[Bug middle-end/19430] Missing uninitialized warning
--- Comment #10 from mike at codeweavers dot com 2006-03-10 15:37 --- Can I bribe you to work on it by fixing a Wine bug in exchange? :) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19430
[Bug c/29827] New: Assigning function with a char param emits a spurious warning
Assigning a function pointer with a char parameter to a pointer with an undefined list causes gcc to emit a warning. [EMAIL PROTECTED]:~/ntnative/loader$ cat x.c void foo(char); void (*f1)() = foo; void bar(int); void (*f2)() = bar; [EMAIL PROTECTED]:~/ntnative/loader$ gcc -c x.c x.c:2: warning: initialization from incompatible pointer type [EMAIL PROTECTED]:~/ntnative/loader$ gcc -v Using built-in specs. Target: x86_64-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --enable-checking=release x86_64-linux-gnu Thread model: posix gcc version 4.1.2 20061028 (prerelease) (Debian 4.1.1-19) -- Summary: Assigning function with a char param emits a spurious warning Product: gcc Version: 4.1.2 Status: UNCONFIRMED Severity: minor Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: mike at codeweavers dot com GCC host triplet: x86_64-linux-gnu GCC target triplet: x86_64-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29827
