From: Harald Anlauf <anlauf@gmx.de>
Date: Mon, 4 Apr 2022 18:42:51 +0000 (+0200)
Subject: Fortran: a RECURSIVE procedure cannot be an INTRINSIC
X-Git-Tag: releases/gcc-11.3.0~87
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=fdaa6de39a5da45dccd06c18dd355893b4cf9060;p=thirdparty%2Fgcc.git

Fortran: a RECURSIVE procedure cannot be an INTRINSIC

gcc/fortran/ChangeLog:

	PR fortran/105138
	* intrinsic.c (gfc_is_intrinsic): When a symbol refers to a
	RECURSIVE procedure, it cannot be an INTRINSIC.

gcc/testsuite/ChangeLog:

	PR fortran/105138
	* gfortran.dg/recursive_reference_3.f90: New test.

Co-authored-by: Steven G. Kargl <kargl@gcc.gnu.org>
(cherry picked from commit d46685b04071a485b56de353d997a866bfc8caba)
---

diff --git a/gcc/fortran/intrinsic.c b/gcc/fortran/intrinsic.c
index a6a18a471e3f..1565ff27fcfb 100644
--- a/gcc/fortran/intrinsic.c
+++ b/gcc/fortran/intrinsic.c
@@ -1142,6 +1142,7 @@ gfc_is_intrinsic (gfc_symbol* sym, int subroutine_flag, locus loc)
 
   /* Check for attributes which prevent the symbol from being INTRINSIC.  */
   if (sym->attr.external || sym->attr.contained
+      || sym->attr.recursive
       || sym->attr.if_source == IFSRC_IFBODY)
     return false;
 
diff --git a/gcc/testsuite/gfortran.dg/recursive_reference_3.f90 b/gcc/testsuite/gfortran.dg/recursive_reference_3.f90
new file mode 100644
index 000000000000..f4e2963aec28
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/recursive_reference_3.f90
@@ -0,0 +1,14 @@
+! { dg-do compile }
+! { dg-options "-std=f2018" }
+! PR fortran/105138 - recursive procedures and shadowing of intrinsics
+
+RECURSIVE FUNCTION LOG_GAMMA(Z) RESULT(RES)
+  COMPLEX, INTENT(IN) :: Z
+  COMPLEX             :: RES
+  RES = LOG_GAMMA(Z)
+END FUNCTION LOG_GAMMA
+
+recursive subroutine date_and_time (z)
+  real :: z
+  if (z > 0) call date_and_time (z-1)
+end subroutine date_and_time