https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83347
Bug ID: 83347
Summary: write pointer to const string possible without warning
Product: gcc
Version: 6.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: aleks at physik dot tu-berlin.de
Target Milestone: ---
It is possible to get a writeable pointer to a const "string".
Point 3 and 4 give an error or warning (as they should),
but point 1 and 2 should at least give a warning.
Point 1 gives a pointer that is violating the const-qualifiers.
Point 1+2 cause undefined behavior, but no warning is shown.
I don't see any use-case where wrinting to a "const string" is a good idea.
If this is really allowed, then it should be discussed.
1. char * p = "TEST"; // no warning or error (NOK)
2. memcpy("abc","def",3); // no warning or error (NOK)
3. const char * cp = 0; char * p2 = cp; // -Wdiscarded-qualifiers (OK)
4. "test" = "w"; // error: assignment to expression with array type (OK)
tested on gcc (GCC) 6.4.0 under Cygwin(MinGW).
Thanks for answer, Alex
