[gcc r12-2726] c++: Fix up #pragma omp declare {simd, variant} and acc routine parsing

[gcc r12-2726] c++: Fix up #pragma omp declare {simd, variant} and acc routine parsing

[Jakub Jelinek]

https://gcc.gnu.org/g:af31cab04770f7a1a1da069415ab62ca2ef54fc4

commit r12-2726-gaf31cab04770f7a1a1da069415ab62ca2ef54fc4
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Aug 4 11:53:48 2021 +0200

    c++: Fix up #pragma omp declare {simd,variant} and acc routine parsing
    
    When parsing default arguments, we need to temporarily clear parser->omp_declare_simd
    and parser->oacc_routine, otherwise it can clash with further declarations
    inside of e.g. lambdas inside of those default arguments.
    
    2021-08-04  Jakub Jelinek  <jakub@redhat.com>
    
            PR c++/101759
            * parser.c (cp_parser_default_argument): Temporarily override
            parser->omp_declare_simd and parser->oacc_routine to NULL.
    
            * g++.dg/gomp/pr101759.C: New test.
            * g++.dg/goacc/pr101759.C: New test.

Diff:
---
 gcc/cp/parser.c                       | 2 ++
 gcc/testsuite/g++.dg/goacc/pr101759.C | 5 +++++
 gcc/testsuite/g++.dg/gomp/pr101759.C  | 8 ++++++++
 3 files changed, 15 insertions(+)

diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 47bf7d9ad1f..02ce9543b86 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -24488,6 +24488,8 @@ cp_parser_default_argument (cp_parser *parser, bool template_parm_p)
      set correctly.  */
   saved_greater_than_is_operator_p = parser->greater_than_is_operator_p;
   parser->greater_than_is_operator_p = !template_parm_p;
+  auto odsd = make_temp_override (parser->omp_declare_simd, NULL);
+  auto ord = make_temp_override (parser->oacc_routine, NULL);
   /* Local variable names (and the `this' keyword) may not
      appear in a default argument.  */
   saved_local_variables_forbidden_p = parser->local_variables_forbidden_p;
diff --git a/gcc/testsuite/g++.dg/goacc/pr101759.C b/gcc/testsuite/g++.dg/goacc/pr101759.C
new file mode 100644
index 00000000000..522a5d4d4e8
--- /dev/null
+++ b/gcc/testsuite/g++.dg/goacc/pr101759.C
@@ -0,0 +1,5 @@
+// PR c++/101759
+// { dg-do compile { target c++11 } }
+
+#pragma acc routine
+int foo (int x = []() { extern int bar (int); return 1; }());
diff --git a/gcc/testsuite/g++.dg/gomp/pr101759.C b/gcc/testsuite/g++.dg/gomp/pr101759.C
new file mode 100644
index 00000000000..905b8755135
--- /dev/null
+++ b/gcc/testsuite/g++.dg/gomp/pr101759.C
@@ -0,0 +1,8 @@
+// PR c++/101759
+// { dg-do compile { target c++11 } }
+
+#pragma omp declare simd
+int foo (int x = []() { extern int bar (int); return 1; }());
+int corge (int = 1);
+#pragma omp declare variant (corge) match (user={condition(true)})
+int baz (int x = []() { extern int qux (int); return 1; }());