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* [gcc r12-7068] c++: add comment
@ 2022-02-05 5:57 Jason Merrill
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From: Jason Merrill @ 2022-02-05 5:57 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:0ef416e7edc4c66a06a3c05025720dfc98cf07f5
commit r12-7068-g0ef416e7edc4c66a06a3c05025720dfc98cf07f5
Author: Jason Merrill <jason@redhat.com>
Date: Thu Feb 3 16:23:24 2022 -0500
c++: add comment
gcc/cp/ChangeLog:
* pt.cc (iterative_hash_template_arg): Add comment.
Diff:
---
gcc/cp/pt.cc | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index 60641d89c19..f6406126b5b 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -1797,6 +1797,10 @@ iterative_hash_template_arg (tree arg, hashval_t val)
switch (code)
{
case ARGUMENT_PACK_SELECT:
+ /* Getting here with an ARGUMENT_PACK_SELECT means we're probably
+ preserving it in a hash table, which is bad because it will change
+ meaning when gen_elem_of_pack_expansion_instantiation changes the
+ ARGUMENT_PACK_SELECT_INDEX. */
gcc_unreachable ();
case ERROR_MARK:
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