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* [gcc r11-10500] Fortran: diagnose USE associated symbols in COMMON blocks [PR108453]
@ 2023-02-04 15:43 Harald Anlauf
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From: Harald Anlauf @ 2023-02-04 15:43 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:be8003ffcfb02dd8ef49ffec01bf96da2d973bc2
commit r11-10500-gbe8003ffcfb02dd8ef49ffec01bf96da2d973bc2
Author: Harald Anlauf <anlauf@gmx.de>
Date: Sat Jan 28 17:59:23 2023 +0100
Fortran: diagnose USE associated symbols in COMMON blocks [PR108453]
gcc/fortran/ChangeLog:
PR fortran/108453
* match.c (gfc_match_common): A USE associated name shall not appear
in a COMMON block (F2018:C8121).
gcc/testsuite/ChangeLog:
PR fortran/108453
* gfortran.dg/common_27.f90: New test.
(cherry picked from commit aba9ff8f30d4245294ea2583de1dc28f1c7ccf7b)
Diff:
---
gcc/fortran/match.c | 10 ++++++++++
gcc/testsuite/gfortran.dg/common_27.f90 | 14 ++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/gcc/fortran/match.c b/gcc/fortran/match.c
index 860b6567d2a..91b31e06e56 100644
--- a/gcc/fortran/match.c
+++ b/gcc/fortran/match.c
@@ -5299,6 +5299,16 @@ gfc_match_common (void)
goto cleanup;
}
+ /* F2018:R874: common-block-object is variable-name [ (array-spec) ]
+ F2018:C8121: A variable-name shall not be a name made accessible
+ by use association. */
+ if (sym->attr.use_assoc)
+ {
+ gfc_error ("Symbol %qs at %C is USE associated from module %qs "
+ "and cannot occur in COMMON", sym->name, sym->module);
+ goto cleanup;
+ }
+
/* Deal with an optional array specification after the
symbol name. */
m = gfc_match_array_spec (&as, true, true);
diff --git a/gcc/testsuite/gfortran.dg/common_27.f90 b/gcc/testsuite/gfortran.dg/common_27.f90
new file mode 100644
index 00000000000..dcde5de2bd2
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/common_27.f90
@@ -0,0 +1,14 @@
+! { dg-do compile }
+! PR fortran/108453 - a use associated variable cannot occur in COMMON
+! Contributed by G.Steinmetz
+
+module m
+ type t
+ end type
+ real :: r
+end
+program p
+ use m, only: t, r
+ common t ! { dg-error "USE associated from module" }
+ common /cm/ r ! { dg-error "USE associated from module" }
+end
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