https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96420
Bug ID: 96420
Summary: -Wsign-extensions warnings are generated from system
header macros
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: pskocik at gmail dot com
Target Milestone: ---
Gcc doesn't silence -Wsign-conversion warnings in the expansion of
system-header macros (e.g., in the expansion of Musl's/Cygwin's FD_SET) unlike
other warnings in system-header macros.
E.g.,
#include <sys/select.h>
void f(int X)
{
fd_set set;
FD_ZERO(&set);
FD_SET(X,&set);
FD_CLR(X+1,&set);
(void)FD_ISSET(X+2,&set);
}
generates -Wsign-conversion warnings when compiled with musl-gcc or with gcc on
Cygwin.
Arguably, this should be fixed in the respective c libs, but the treatment of
-Wsign-conversion in system-header macro expansion does seem inconsistent with
that of other warnings in that context.
