re PR fortran/33269 (Diagnose missing "(" in "PRINT ('a'),")

PR fortran/33269
fortran/
* io.c (check_format_string): Move NULL and constant checks into
this function.
(check_io_constraints): Call gfc_simplify_expr() before calling
check_format_string().  Remove NULL and constant checks.
testsuite/
* gfortran.dg/fmt_error_2.f90: New.

From-SVN: r128732

gcc/fortran/ChangeLog

+2007-09-23  Tobias Schlter  <tobi@gcc.gnu.org>
+
+	PR fortran/33269
+	* io.c (check_format_string): Move NULL and constant checks into
+	this function.
+	(check_io_constraints): Call gfc_simplify_expr() before calling
+	check_format_string().  Remove NULL and constant checks.
+
 2007-09-24  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
 
 	PR fortran/33538

gcc/fortran/io.c

@@ -919,6 +919,9 @@ finished:
 static try
 check_format_string (gfc_expr *e, bool is_input)
 {
+  if (!e || e->expr_type != EXPR_CONSTANT)
+    return SUCCESS;
+
   mode = MODE_STRING;
   format_string = e->value.character.string;
   return check_format (is_input);
@@ -2786,8 +2789,8 @@ if (condition) \
     }
 
   expr = dt->format_expr;
-  if (expr != NULL && expr->expr_type == EXPR_CONSTANT
-      && check_format_string (expr, k == M_READ) == FAILURE)
+  if (gfc_simplify_expr (expr, 0) == FAILURE
+      || check_format_string (expr, k == M_READ) == FAILURE)
     return MATCH_ERROR;
 
   return m;

gcc/testsuite/ChangeLog

+2007-09-23  Tobias Schlter  <tobi@gcc.gnu.org>
+
+	PR fortran/33269
+	* io.c (check_format_string): Move NULL and constant checks into
+	this function.
+	(check_io_constraints): Call gfc_simplify_expr() before calling
+	check_format_string().  Remove NULL and constant checks.
+
 2007-09-24  Roman Zippel <zippel@linux-m68k.org>
 
 	* gcc.c-torture/execute/loop-2f.x: New. Disable test for m68k-linux.

gcc/testsuite/gfortran.dg/fmt_error_2.f90

+! { dg-do compile }
+! PR 33269: we used to not simplify format strings before checking if
+! they were valid, leading to a missed error.
+
+IMPLICIT CHARACTER*5 (h-z)
+
+CHARACTER*5 f
+CHARACTER*5 bad, good
+parameter(bad="a", good="(a)")
+
+PRINT ('a'), "hello" ! { dg-error "Missing leading left parenthesis in format string" }
+WRITE (*, ("a")) "error"  ! { dg-error "Missing leading left parenthesis in format string" }
+
+PRINT 'a', "hello" ! { dg-error "Missing leading left parenthesis in format string" }
+WRITE (*, "a") "error"  ! { dg-error "Missing leading left parenthesis in format string" }
+WRITE (*, bad) "error"  ! { dg-error "Missing leading left parenthesis in format string" }
+
+PRINT 'a' // ', a', "err", "or"   ! { dg-error "Missing leading left parenthesis in format string" }
+
+PRINT '(' // 'a'  ! { dg-error "Unexpected end of format string in format string" }
+
+! the following are ok
+PRINT "(2f5.3)", bar, foo
+PRINT ' (a)', "hello"
+WRITE (*, " ((a))") "hello"
+print "(a" // ")", "all is fine"
+print good, "great"
+
+! verify that we haven't broken non-constant expressions
+f = "(f5.3)"
+print f, 3.14159
+print (f), 2.71813
+print implicitly_typed, "something"
+write (*, implicitly_typed_as_well) "something else"
+END