[gcc r17-2717] c++: Fix ICE with loop pragmas at class scope [PR126323]

https://gcc.gnu.org/g:cd453025faf5ab3ada2428e5fc372d9a6328c9cb

commit r17-2717-gcd453025faf5ab3ada2428e5fc372d9a6328c9cb
Author: Odysseas Georgoudis <[email protected]>
Date:   Fri Jul 24 15:17:32 2026 -0400

    c++: Fix ICE with loop pragmas at class scope [PR126323]
    
    cp_parser_pragma rejected GCC loop pragmas at namespace scope, but not
    at class scope.  Consequently, it attempted to parse the following loop
    as a statement while in a member-declaration context, leading to an ICE
    when processing the loop initializer.
    
    Accept these pragmas only in statement contexts.
    
    gcc/cp/ChangeLog:
    
            PR c++/126323
            * parser.cc (cp_parser_pragma): Reject GCC loop pragmas outside
            statement contexts.
    
    gcc/testsuite/ChangeLog:
    
            PR c++/126323
            * g++.dg/parse/pr126323.C: New test.
    
    Reviewed-by: Jason Merrill <[email protected]>

Diff:
---
 gcc/cp/parser.cc                      |  2 +-
 gcc/testsuite/g++.dg/parse/pr126323.C | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
index 3f042bec1c66..13ebd64c4836 100644
--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -57597,7 +57597,7 @@ cp_parser_pragma (cp_parser *parser, enum pragma_context context, bool *if_p)
 	    gcc_unreachable ();
 	}
 
-	if (context == pragma_external)
+	if (context != pragma_stmt && context != pragma_compound)
 	  {
 	    error_at (pragma_tok->location,
 		      "%<#pragma GCC %s%> must be inside a function",
diff --git a/gcc/testsuite/g++.dg/parse/pr126323.C b/gcc/testsuite/g++.dg/parse/pr126323.C
new file mode 100644
index 000000000000..2224733ccb33
--- /dev/null
+++ b/gcc/testsuite/g++.dg/parse/pr126323.C
@@ -0,0 +1,10 @@
+// PR c++/126323
+
+class C {
+#pragma GCC novector	// { dg-error "must be inside a function" }
+#pragma GCC unroll(0)	// { dg-error "must be inside a function" }
+#pragma GCC ivdep	// { dg-error "must be inside a function" }
+  for (int i = 0; i < 2; i++)	// { dg-error "expected unqualified-id" }
+				// { dg-error "does not name a type" "" { target *-*-* } .-1 }
+    ;
+};