https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94169
Bug ID: 94169
Summary: warn for modifying getenv() result
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
Bug 94157 was caused by modifying the string pointed to by the value returned
from getenv(), which is undefined according to both C and POSIX. C11 says in
7.22.4.8, p4:
The getenv function returns a pointer to a string associated with the matched
list member. The string pointed to shall not be modified by the program, but
may be overwritten by a subsequent call to the getenv function.
It would be helpful if GCC issued a warning for attempts to modify the returned
string. This could be done by extending -Wstringop-overflow.
