Fortran : ICE in generic_correspondence PR95584

Output an error for ambiguous interfaces in generic interface
instead of ICE.

2020-07-02  Steven G. Kargl  <kargl@gcc.gnu.org>

gcc/fortran/

	PR fortran/95584
	* interface.c (generic_correspondence): Only use the pointer
	to a symbol if exists.

2020-07-02  Mark Eggleston  <markeggleston@gcc.gnu.org>

gcc/testsuite/

	PR fortran/95584
	* gfortran.dg/pr95584.f90: New test.

diff --git a/gcc/fortran/interface.c b/gcc/fortran/interface.c
index b1a75a37b0e58b6afc485a2b984252d23edc0e3f..0cc504f4e04b091314660352d2a439ecc2c04f3d 100644 (file)
--- a/gcc/fortran/interface.c
+++ b/gcc/fortran/interface.c
@@ -1257,7 +1257,7 @@ generic_correspondence (gfc_formal_arglist *f1, gfc_formal_arglist *f2,
 
   while (f1)
     {
-      if (f1->sym->attr.optional)
+      if (!f1->sym || f1->sym->attr.optional)
        goto next;
 
       if (p1 && strcmp (f1->sym->name, p1) == 0)

diff --git a/gcc/testsuite/gfortran.dg/pr95584.f90 b/gcc/testsuite/gfortran.dg/pr95584.f90
new file mode 100644 (file)
index 0000000..4504f7b
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr95584.f90
@@ -0,0 +1,16 @@
+! { dg-do compile }
+
+program p
+   interface s
+      subroutine g(x, *)
+      end
+      subroutine h(y, *)
+      end
+   end interface
+end
+
+! { dg-warning "Obsolescent feature: Alternate-return argument" " " { target *-*-* } 5 }
+! { dg-warning "Obsolescent feature: Alternate-return argument" " " { target *-*-* } 7 }
+! { dg-error ".1." " " { target *-*-* } 5 }
+! { dg-error "Ambiguous interfaces in generic interface" " " { target *-*-* } 7 }
+