https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70819
Bug ID: 70819
Summary: constexpr error location wrong
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: nathan at gcc dot gnu.org
Target Milestone: ---
Created attachment 38345
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38345&action=edit
testcase
Invoked as:
nathan@morden:28>./cc1plus -fpreprocessed cexpr-error.ii
we get:
constexpr int fn6(const int&, int) constexpr int fn7(const int*, int)
cexpr-error.ii: At global scope:
cexpr-error.ii:17:24: in constexpr expansion of 'fn7(0u, 0)'
cexpr-error.ii:14:14: in constexpr expansion of 'fn6((* a), b)'
cexpr-error.ii:7:7: error: 'a' is not a constant expression
b = a;
^
cexpr-error.ii:18:24: in constexpr expansion of 'fn7(0u, 8)'
cexpr-error.ii:14:14: in constexpr expansion of 'fn6((* a), b)'
cexpr-error.ii:6:13: in constexpr expansion of 'fn6(a, 0)'
cexpr-error.ii:18:43: error: 'a' is not a constant expression
constexpr int n4 = fn7 ((const int *) 0, 8);
The first error is correctly located at tha 'b = a;' location. The second
instance is not, and shows the original call site. inside constexpr.c the
first error is from an evaluation of the original function body. the second is
from a cloned copy via the recursive call. Something about cloning is throwing
off the error location.
