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

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

[Jakub Jelinek]

Hi!

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.

Bootstrapped/regtested on x86_64-linux and i686-linux, committed to trunk,
will backport eventually.

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.

--- gcc/cp/parser.c.jj	2021-08-03 17:38:07.541725977 +0200
+++ gcc/cp/parser.c	2021-08-03 19:23:08.693843077 +0200
@@ -24509,6 +24509,8 @@ cp_parser_default_argument (cp_parser *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;
--- gcc/testsuite/g++.dg/gomp/pr101759.C.jj	2021-08-03 19:32:56.091725711 +0200
+++ gcc/testsuite/g++.dg/gomp/pr101759.C	2021-08-03 19:36:03.762138412 +0200
@@ -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; }());
--- gcc/testsuite/g++.dg/goacc/pr101759.C.jj	2021-08-03 19:33:15.079463941 +0200
+++ gcc/testsuite/g++.dg/goacc/pr101759.C	2021-08-03 19:35:53.148284738 +0200
@@ -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; }());

	Jakub