https://bugzilla.mindrot.org/show_bug.cgi?id=3809
Bug ID: 3809
Summary: snprintf const char *fmt detection false negatives
with Clang and _FORTIFY_SOURCE=2
Product: Portable OpenSSH
Version: -current
Hardware: amd64
OS: FreeBSD
Status: NEW
Severity: enhancement
Priority: P5
Component: Build system
Assignee: unassigned-b...@mindrot.org
Reporter: jldu...@gmail.com
Created attachment 3869
--> https://bugzilla.mindrot.org/attachment.cgi?id=3869&action=edit
const/no const detection program
The snippet (attached conftest.c) used to detect whether a system can
declare [v]snprintf() const char *fmt incorrectly fails to detect it on
FreeBSD if compiled with Clang and with _FORTIFY_SOURCE=2 (NetBSD and
macOS might fail as well, but are probably using gcc) :
$ cc -D_FORTIFY_SOURCE=2 conftest.c
conftest.c:2:5: error: expected identifier or '('
2 | int snprintf(char *a, size_t b, const char *c, ...) { return 0;
}
| ^
/usr/include/ssp/stdio.h:88:33: note: expanded from macro 'snprintf'
88 | #define snprintf(str, len, ...) __extension__ ({ \
| ^
1 error generated.
A workaround is attached that un-defines source fortifications for the
detection script (unsure if this is the best approach).
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