[gcc r13-5705] Fortran: prevent redundant integer division truncation warnings [PR108592]

[Harald Anlauf <anlauf@gcc.gnu.org>]

https://gcc.gnu.org/g:d042f118798ae0648b45f97e63b0e5ab7c82c8ef

commit r13-5705-gd042f118798ae0648b45f97e63b0e5ab7c82c8ef
Author: Harald Anlauf <anlauf@gmx.de>
Date:   Mon Jan 30 22:46:43 2023 +0100

    Fortran: prevent redundant integer division truncation warnings [PR108592]
    
    gcc/fortran/ChangeLog:
    
            PR fortran/108592
            * arith.cc (gfc_arith_divide): Emit integer division truncation
            warnings using gfc_warning instead of gfc_warning_now to prevent
            redundant messages.
    
    gcc/testsuite/ChangeLog:
    
            PR fortran/108592
            * gfortran.dg/pr108592.f90: New test.

Diff:
---
 gcc/fortran/arith.cc                   | 2 +-
 gcc/testsuite/gfortran.dg/pr108592.f90 | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/gcc/fortran/arith.cc b/gcc/fortran/arith.cc
index 6de6d21c73d..d0d1c0b03d2 100644
--- a/gcc/fortran/arith.cc
+++ b/gcc/fortran/arith.cc
@@ -778,7 +778,7 @@ gfc_arith_divide (gfc_expr *op1, gfc_expr *op2, gfc_expr **resultp)
 	    {
 	      char *p;
 	      p = mpz_get_str (NULL, 10, result->value.integer);
-	      gfc_warning_now (OPT_Winteger_division, "Integer division "
+	      gfc_warning (OPT_Winteger_division, "Integer division "
 			       "truncated to constant %qs at %L", p,
 			       &op1->where);
 	      free (p);
diff --git a/gcc/testsuite/gfortran.dg/pr108592.f90 b/gcc/testsuite/gfortran.dg/pr108592.f90
new file mode 100644
index 00000000000..224b1d8d1fc
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr108592.f90
@@ -0,0 +1,8 @@
+! { dg-do compile }
+! { dg-options "-Winteger-division" }
+! PR fortran/108592 - warn only once for truncation of integer division
+
+program foo
+  if (8 < (20/9)) stop 1 ! { dg-bogus "Integer division.*Integer division" }
+! { dg-message "Integer division truncated" "" { target *-*-* } .-1 }
+end program