https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79677
Bug ID: 79677
Summary: Weird handling of -Werror=
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: jakub at gcc dot gnu.org
Target Milestone: ---
On the following testcase:
int
main()
{
char message[10] = "";
__builtin_printf(message);
return 0;
}
we warn (or error) e.g. with:
-Wformat -Wformat-security
-Wformat -Werror=format-security
-Wall -Wformat-security
-Wall -Werror=format-security
-Wformat -Wformat-security -Wformat
-Wall -Wformat-security -Wformat
-Wformat -Wformat-security -Wall
-Wall -Wformat-security -Wall
-Wformat -Wformat-security -Werror=format-security -Wformat
-Wall -Wformat-security -Werror=format-security -Wformat
-Wformat -Wformat-security -Werror=format-security -Wall
-Wall -Wformat-security -Werror=format-security -Wall
but not with:
-Wformat -Werror=format-security -Wformat
-Wall -Werror=format-security -Wformat
-Wformat -Werror=format-security -Wall
-Wall -Werror=format-security -Wall
-Wall implies -Wformat (level 1) and -Wformat only for level 2 implies
-Wformat-security, so something in the -Wformat or -Wall handling disables
warn_format_security, but strangely only when the -Werror option is used.
