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* [gcc r12-7112] c++: Remove superflous assert [PR104403]
@ 2022-02-08 19:16 Jakub Jelinek
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From: Jakub Jelinek @ 2022-02-08 19:16 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:1755141a9ea0dddabb52776cddc4c9325eed27c6
commit r12-7112-g1755141a9ea0dddabb52776cddc4c9325eed27c6
Author: Jakub Jelinek <jakub@redhat.com>
Date: Tue Feb 8 20:15:42 2022 +0100
c++: Remove superflous assert [PR104403]
I've added the assert because start_decl diagnoses such vars for C++20 and
earlier:
if (current_function_decl && VAR_P (decl)
&& DECL_DECLARED_CONSTEXPR_P (current_function_decl)
&& cxx_dialect < cxx23)
but as can be seen, we cam trigger the assert in older standards e.g. during
non-manifestly constant evaluation. Rather than refining the assert that
DECL_EXPRs for such vars don't appear for C++20 and older if they are inside
of functions declared constexpr this patch just removes the assert, the
code rejects encountering those vars in constant expressions anyway.
2022-02-08 Jakub Jelinek <jakub@redhat.com>
PR c++/104403
* constexpr.cc (cxx_eval_constant_expression): Don't assert DECL_EXPRs
of TREE_STATIC vars may only appear in -std=c++23.
* g++.dg/cpp0x/lambda/lambda-104403.C: New test.
Diff:
---
gcc/cp/constexpr.cc | 1 -
gcc/testsuite/g++.dg/cpp0x/lambda/lambda-104403.C | 8 ++++++++
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/gcc/cp/constexpr.cc b/gcc/cp/constexpr.cc
index fd051172e00..9b8e0eced4b 100644
--- a/gcc/cp/constexpr.cc
+++ b/gcc/cp/constexpr.cc
@@ -6652,7 +6652,6 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t,
/* Allow __FUNCTION__ etc. */
&& !DECL_ARTIFICIAL (r))
{
- gcc_assert (cxx_dialect >= cxx23);
if (!ctx->quiet)
{
if (CP_DECL_THREAD_LOCAL_P (r))
diff --git a/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-104403.C b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-104403.C
new file mode 100644
index 00000000000..f231d3ea2c9
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-104403.C
@@ -0,0 +1,8 @@
+// PR c++/104403
+// { dg-do compile { target c++11 } }
+
+int
+main ()
+{
+ []{ switch (0) { case 0: static int value; return &value; } };
+}
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