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openmp: Improve Fortran Diagnostics for Linear Clause

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This patch improves diagnostics for the linear clause,
providing a more accurate and intuitive recommendation
for remediation if the deprecated syntax is used.
Additionally updates the relevant test to reflect the
changed verbiage of the warning.

gcc/fortran/ChangeLog:

	* openmp.cc (gfc_match_omp_clauses): New diagnostic logic.

libgomp/ChangeLog:

	* testsuite/libgomp.fortran/pr84418-1.f90: Fix verbiage of
	dg-warning to reflect updated warning.
This commit is contained in:
supers1ngular
2026-01-05 17:09:02 -08:00
parent fb93843587
commit cdb15b3900
2 changed files with 48 additions and 6 deletions
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51
gcc/fortran/openmp.cc
View File

@@ -3481,11 +3481,6 @@ gfc_match_omp_clauses (gfc_omp_clauses **cp, const omp_mask mask,
gfc_current_locus = old_loc;
break;
}
if (old_linear_modifier)
gfc_warning (OPT_Wdeprecated_openmp,
"Specification of the list items as arguments to "
"the modifiers at %L is deprecated since "
"OpenMP 5.2", &saved_loc);
if (linear_op != OMP_LINEAR_DEFAULT)
{
if (gfc_match (" :") == MATCH_YES)
@@ -3509,6 +3504,52 @@ gfc_match_omp_clauses (gfc_omp_clauses **cp, const omp_mask mask,
goto error;
}
}
if (old_linear_modifier)
{
char var_names[512]{};
int count, offset = 0;
for (gfc_omp_namelist *n = *head; n; n = n->next)
{
if (!n->next)
count = snprintf (var_names + offset,
sizeof (var_names) - offset,
"%s", n->sym->name);
else
count = snprintf (var_names + offset,
sizeof (var_names) - offset,
"%s, ", n->sym->name);
if (count < 0 || count >= ((int)sizeof (var_names))
- offset)
{
snprintf (var_names, 512, "%s, ..., ",
(*head)->sym->name);
while (n->next)
n = n->next;
offset = strlen (var_names);
snprintf (var_names + offset,
sizeof (var_names) - offset,
"%s", n->sym->name);
break;
}
offset += count;
}
char *var_names_for_warn = var_names;
const char *op_name;
switch (linear_op)
{
case OMP_LINEAR_REF: op_name = "ref"; break;
case OMP_LINEAR_VAL: op_name = "val"; break;
case OMP_LINEAR_UVAL: op_name = "uval"; break;
default: gcc_unreachable ();
}
gfc_warning (OPT_Wdeprecated_openmp,
"Specification of the list items as "
"arguments to the modifiers at %L is "
"deprecated; since OpenMP 5.2, use "
"%<linear(%s : %s%s)%>", &saved_loc,
var_names_for_warn, op_name,
step == nullptr ? "" : ", step(...)");
}
else if (end_colon)
{
bool has_error = false;

3
libgomp/testsuite/libgomp.fortran/pr84418-1.f90
View File

@@ -3,6 +3,7 @@
! { dg-options "-fno-inline" }
! { dg-additional-options "-msse2" { target sse2_runtime } }
! { dg-additional-options "-mavx" { target avx_runtime } }
! { dg-warning "Specification of the list items as arguments to the modifiers at \\(1\\) is deprecated; since OpenMP 5.2, use 'linear\\(x, y : ref\\)' \\\[-Wdeprecated-openmp\\\]" "" { target *-*-* } 24 }
real :: a(1024), b(1024), c(1024)
integer :: i
@@ -20,7 +21,7 @@
contains
real function foo (x, y)
real :: x, y
!$omp declare simd linear (ref (x, y)) ! { dg-warning "Specification of the list items as arguments to the modifiers at \\(1\\) is deprecated since OpenMP 5.2 \\\[-Wdeprecated-openmp\\\]" }
!$omp declare simd linear (ref (x, y))
foo = x + y
end function
end