Fortran: OpenMP fix declare simd inside modules and absent linear [PR106566]

gcc/fortran/ChangeLog:

	PR fortran/106566
	* openmp.cc (gfc_match_omp_declare_simd): Accept module procedures.
	* trans-openmp.cc (gfc_trans_omp_clauses): Fix declare simd without
	linear-step value.

gcc/testsuite/ChangeLog:

	PR fortran/106566
	* gfortran.dg/gomp/declare-simd-4.f90: New test.
	* gfortran.dg/gomp/declare-simd-5.f90: New test.

 gcc/fortran/openmp.cc                             |  8 +++-
 gcc/fortran/trans-openmp.cc                       |  2 +
 gcc/testsuite/gfortran.dg/gomp/declare-simd-4.f90 | 42 +++++++++++++++++++
 gcc/testsuite/gfortran.dg/gomp/declare-simd-5.f90 | 49 +++++++++++++++++++++++
 4 files changed, 99 insertions(+), 2 deletions(-)

diff --git a/gcc/fortran/openmp.cc b/gcc/fortran/openmp.cc
index a7eb6c3e8f4..e430f4c49dd 100644
--- a/gcc/fortran/openmp.cc
+++ b/gcc/fortran/openmp.cc
@@ -4213,9 +4213,13 @@ gfc_match_omp_declare_simd (void)
   gfc_omp_declare_simd *ods;
   bool needs_space = false;
 
-  switch (gfc_match (" ( %s ) ", &proc_name))
+  switch (gfc_match (" ( "))
     {
-    case MATCH_YES: break;
+    case MATCH_YES:
+      if (gfc_match_symbol (&proc_name, /* host assoc = */ true) != MATCH_YES
+	  || gfc_match (" ) ") != MATCH_YES)
+	return MATCH_ERROR;
+      break;
     case MATCH_NO: proc_name = NULL; needs_space = true; break;
     case MATCH_ERROR: return MATCH_ERROR;
     }
diff --git a/gcc/fortran/trans-openmp.cc b/gcc/fortran/trans-openmp.cc
index de27ed52c02..22e6dd254c7 100644
--- a/gcc/fortran/trans-openmp.cc
+++ b/gcc/fortran/trans-openmp.cc
@@ -2798,6 +2798,8 @@ gfc_trans_omp_clauses (stmtblock_t *block, gfc_omp_clauses *clauses,
 			  }
 			else
 			  {
+			    if (last_step == NULL_TREE)
+			      last_step = size_one_node;
 			    if (kind == OMP_CLAUSE_LINEAR_REF)
 			      {
 				tree type;
diff --git a/gcc/testsuite/gfortran.dg/gomp/declare-simd-4.f90 b/gcc/testsuite/gfortran.dg/gomp/declare-simd-4.f90
new file mode 100644
index 00000000000..44132525963
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/gomp/declare-simd-4.f90
@@ -0,0 +1,42 @@
+! { dg-do compile }
+! { dg-additional-options "-fdump-tree-gimple" }
+!
+! PR fortran/106566
+!
+! { dg-final { scan-tree-dump-times "__attribute__\\(\\(omp declare simd \\(linear\\(0:ref,step\\(4\\)\\) simdlen\\(8\\)\\)\\)\\)" 2 "gimple" } }
+! { dg-final { scan-tree-dump-times "__attribute__\\(\\(omp declare simd \\(linear\\(0:ref,step\\(8\\)\\) simdlen\\(8\\)\\)\\)\\)" 2 "gimple" } }
+
+subroutine add_one2(p)
+  implicit none
+  !$omp declare simd(add_one2) linear(p: ref) simdlen(8)
+  integer :: p
+
+  p = p + 1
+end subroutine
+
+subroutine linear_add_one2(p)
+  implicit none
+  !$omp declare simd(linear_add_one2) linear(p: ref, step(2)) simdlen(8)
+  integer :: p
+
+  p = p + 1
+end subroutine
+
+module m
+   integer, parameter :: NN = 1023
+   integer :: a(NN)
+contains
+  subroutine module_add_one2(q)
+    implicit none
+    !$omp declare simd(module_add_one2) linear(q: ref) simdlen(8)
+    integer :: q
+    q = q + 1
+  end subroutine
+
+  subroutine linear_add_one2(q)
+    implicit none
+    !$omp declare simd(linear_add_one2) linear(q: ref, step(2)) simdlen(8)
+    integer :: q
+    q = q + 1
+  end subroutine
+end module
diff --git a/gcc/testsuite/gfortran.dg/gomp/declare-simd-5.f90 b/gcc/testsuite/gfortran.dg/gomp/declare-simd-5.f90
new file mode 100644
index 00000000000..f5880f50090
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/gomp/declare-simd-5.f90
@@ -0,0 +1,49 @@
+! { dg-do compile }
+!
+! PR fortran/106566
+!
+
+subroutine add_one2(p)
+  implicit none
+  procedure(add_one2) :: ext1
+  !$omp declare simd(ext1) linear(p: ref) simdlen(8)  ! { dg-error "OMP DECLARE SIMD should refer to containing procedure 'add_one2'" }
+  integer :: p
+
+  p = p + 1
+end subroutine
+
+subroutine linear_add_one2(p)
+  implicit none
+  procedure(linear_add_one2) :: ext2
+  !$omp declare simd(ext2) linear(p: ref, step(2)) simdlen(8)  ! { dg-error "OMP DECLARE SIMD should refer to containing procedure 'linear_add_one2'" }
+  integer :: p
+
+  p = p + 1
+end subroutine
+
+module m
+   integer, parameter :: NN = 1023
+   integer :: a(NN)
+contains
+  subroutine some_proc(r)
+    integer :: r
+  end subroutine
+  subroutine module_add_one2(q)
+    implicit none
+    !$omp declare simd(some_proc) linear(q: ref) simdlen(8)  ! { dg-error "OMP DECLARE SIMD should refer to containing procedure 'module_add_one2'" }
+    integer :: q
+    q = q + 1
+  end subroutine
+
+  subroutine module_linear_add_one2(q)
+    implicit none
+    interface
+      subroutine other_proc(r)
+        integer :: r
+      end subroutine
+    end interface
+    !$omp declare simd(other_proc) linear(q: ref, step(2)) simdlen(8)  ! { dg-error "OMP DECLARE SIMD should refer to containing procedure 'module_linear_add_one2'" }
+    integer :: q
+    q = q + 1
+  end subroutine
+end module