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* [gcc r13-1841] c++: ICE with erroneous template redeclaration [PR106311]
@ 2022-07-26 12:04 Marek Polacek
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From: Marek Polacek @ 2022-07-26 12:04 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:2333b58c9892667545d0c2c3ecd2d7b947197511
commit r13-1841-g2333b58c9892667545d0c2c3ecd2d7b947197511
Author: Marek Polacek <polacek@redhat.com>
Date: Fri Jul 15 09:51:50 2022 -0400
c++: ICE with erroneous template redeclaration [PR106311]
Here we ICE trying to get DECL_SOURCE_LOCATION of the parm that happens
to be error_mark_node in this ill-formed test. I kept running into this
while reducing code, so it'd be good to have it fixed.
PR c++/106311
gcc/cp/ChangeLog:
* pt.cc (redeclare_class_template): Check DECL_P before accessing
DECL_SOURCE_LOCATION.
gcc/testsuite/ChangeLog:
* g++.dg/template/redecl5.C: New test.
Diff:
---
gcc/cp/pt.cc | 5 ++++-
gcc/testsuite/g++.dg/template/redecl5.C | 5 +++++
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index c415db304c9..6c581fe0fb7 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -6377,7 +6377,10 @@ redeclare_class_template (tree type, tree parms, tree cons)
{
auto_diagnostic_group d;
error ("template parameter %q+#D", tmpl_parm);
- inform (DECL_SOURCE_LOCATION (parm), "redeclared here as %q#D", parm);
+ if (DECL_P (parm))
+ inform (DECL_SOURCE_LOCATION (parm), "redeclared here as %q#D", parm);
+ else
+ inform (input_location, "redeclared here");
return false;
}
diff --git a/gcc/testsuite/g++.dg/template/redecl5.C b/gcc/testsuite/g++.dg/template/redecl5.C
new file mode 100644
index 00000000000..fb2d698e6bc
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/redecl5.C
@@ -0,0 +1,5 @@
+// PR c++/106311
+// { dg-do compile }
+
+template <typename, long> struct array; // { dg-error "template parameter" }
+template <typename, size_t X> struct array { }; // { dg-error "declared" }
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