https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102846
Bug ID: 102846
Summary: Misleading suggestion to include cassert
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: federico.kircheis at gmail dot com
Target Milestone: ---
Consider following snippet (https://godbolt.org/z/9e19bP1Gh)
----
#include <cassert>
template <class F, class C1>
auto verify(F f, C1* p1){
f(p1);
return p1;
}
void bar(void* ptr){
// no error here, as cassert is included
assert(true);
// error here, gcc thinks that cassert is missing
auto v = verify(assert, ptr);
}
----
GCC does not compile the program successfully (this is unfortunately correct),
but the diagnostic is misleading:
----
<source>: In function 'void bar(void*)':
<source>:15:21: error: 'assert' was not declared in this scope
15 | auto v = verify(assert, ptr);
| ^~~~~~
<source>:2:1: note: 'assert' is defined in header '<cassert>'; did you forget
to '#include <cassert>'?
1 | #include <cassert>
+++ |+#include <cassert>
2 |
----
As assert is a macro and not a function, it cannot be generally used as an
argument of another function.
Thus the error is not the not-missing include.
