[PATCH] Fortran: force error on bad KIND specifier [PR88552]

[Harald Anlauf <anlauf@gmx.de>]

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Dear all,

we sometimes silently accept wrong declarations with unbalanced
parentheses, as the PR and testcases therein show.

It appears that the fix is obvious: use the existing error paths in
gfc_match_kind_spec and error return from gfc_match_decl_type_spec.
I'm still posting it here in case I have missed something not so
obvious.

The patch regtests cleanly on x86_64-pc-linux-gnu.  OK for mainline?

Thanks,
Harald


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From a30ff5af130c4d33c086fd136978d5f49cb8bde4 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Thu, 1 Jun 2023 20:56:11 +0200
Subject: [PATCH] Fortran: force error on bad KIND specifier [PR88552]

gcc/fortran/ChangeLog:

	PR fortran/88552
	* decl.cc (gfc_match_kind_spec): Use error path on missing right
	parenthesis.
	(gfc_match_decl_type_spec): Use error return when an error occurred
	during matching a KIND specifier.

gcc/testsuite/ChangeLog:

	PR fortran/88552
	* gfortran.dg/pr88552.f90: New test.
---
 gcc/fortran/decl.cc                   | 4 ++++
 gcc/testsuite/gfortran.dg/pr88552.f90 | 6 ++++++
 2 files changed, 10 insertions(+)
 create mode 100644 gcc/testsuite/gfortran.dg/pr88552.f90

diff --git a/gcc/fortran/decl.cc b/gcc/fortran/decl.cc
index 1de2b231242..deb20647fb9 100644
--- a/gcc/fortran/decl.cc
+++ b/gcc/fortran/decl.cc
@@ -3366,6 +3366,7 @@ close_brackets:
       else
 	gfc_error ("Missing right parenthesis at %C");
       m = MATCH_ERROR;
+      goto no_match;
     }
   else
      /* All tests passed.  */
@@ -4716,6 +4717,9 @@ get_kind:
       return MATCH_ERROR;
     }

+  if (m == MATCH_ERROR)
+    return MATCH_ERROR;
+
   /* Defer association of the KIND expression of function results
      until after USE and IMPORT statements.  */
   if ((gfc_current_state () == COMP_NONE && gfc_error_flag_test ())
diff --git a/gcc/testsuite/gfortran.dg/pr88552.f90 b/gcc/testsuite/gfortran.dg/pr88552.f90
new file mode 100644
index 00000000000..15e1b372f8f
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr88552.f90
@@ -0,0 +1,6 @@
+! { dg-do compile }
+! PR fortran/88552
+! Contributed by G.Steinmetz
+
+integer(len((c)) :: n   ! { dg-error "must be CHARACTER" }
+end
--
2.35.3