craycc/ftn: OpenMP 5.1/5.2/6.0 forms HPE does not claim are rejected, and some crash the compiler instead of a diagnostic

Legality: not independently confirmed. no independent review yet How this is checked

Same issue as catalog/cce-c-map-iterator-ice; this program is another reproducer of it.

Affected variants

Compiler	MI300A gfx942 unified memory (XNACK 1)	MI300A gfx942 copy (XNACK 0)	MI250X gfx90a copy (XNACK 0)	MI300X gfx942 copy (XNACK 0)	MI350X gfx950 copy (XNACK 0)	A100 sm_80 separate memory	A100 sm_80 managed memory
AFAR 24.3.0	correct	correct	correct	correct	correct	n/a	n/a
CCE 19.0.0	not supported	not supported	not supported	unknown not run	unknown not run	n/a	n/a
CCE 20.0.2	not supported	not supported	not supported	unknown not run	unknown not run	n/a	n/a
CCE 21.0.3	not supported	not supported	not supported	unknown not run	unknown not run	n/a	n/a
CCE 21.0.4	not supported	not supported	not supported	unknown not run	unknown not run	n/a	n/a
NVHPC 25.11	n/a	n/a	n/a	n/a	n/a	fails another way	fails another way
NVHPC 26.9	n/a	n/a	n/a	n/a	n/a	fails another way	fails another way
GCC 16.2.0	correct	correct	correct	correct	correct	correct	n/a

"behaves incorrectly" / "not supported": this issue, confirmed in up to four environments (another build directory, another node, a repeat). "fails another way": a different failure, not counted as this issue. "unknown": not run there, or the runs disagree.

Messages

Result	Compiler and GPU	Message
not supported	CCE 19.0.0, MI300A unified CCE 19.0.0, MI300A copy CCE 19.0.0, MI250X	show Warning: Headers and libraries from cray-libsci/25.03.0 will be ignored because depends on PE_MPICH which is unavailable.. !$omp requires atomic_default_mem_order(release) ^ ftn-1725 ftn: ERROR GEN_PROG, File = cce-atomic-default-mem-order-acquire-release-rejected.f90, Line = 4, Column = 50 Unexpected syntax while parsing the DIRECTIVE statement : "(seq_cst \| acq_rel \| relaxed)" was expected but found ")". Cray Fortran : 27 source lines Cray Fortran : 1 errors, 0 warnings, 0 other messages, 0 ansi
not supported	CCE 20.0.2, MI300A unified CCE 20.0.2, MI300A copy CCE 20.0.2, MI250X	show Warning: Headers and libraries from cray-libsci/25.09.0 will be ignored because depends on PE_MPICH which is unavailable.. !$omp requires atomic_default_mem_order(release) ^ ftn-1725 ftn: ERROR GEN_PROG, File = cce-atomic-default-mem-order-acquire-release-rejected.f90, Line = 4, Column = 50 Unexpected syntax while parsing the DIRECTIVE statement : "(seq_cst \| acq_rel \| relaxed)" was expected but found ")". Cray Fortran : 27 source lines Cray Fortran : 1 errors, 0 warnings, 0 other messages, 0 ansi
not supported	CCE 21.0.3, MI300A unified CCE 21.0.3, MI300A copy CCE 21.0.3, MI250X CCE 21.0.4, MI300A unified CCE 21.0.4, MI300A copy CCE 21.0.4, MI250X	show Warning: Headers and libraries from cray-libsci/26.03.0 will be ignored because depends on PE_MPICH which is unavailable.. !$omp requires atomic_default_mem_order(release) ^ ftn-1725 ftn: ERROR GEN_PROG, File = cce-atomic-default-mem-order-acquire-release-rejected.f90, Line = 4, Column = 50 Unexpected syntax while parsing the DIRECTIVE statement : "(seq_cst \| acq_rel \| relaxed)" was expected but found ")". Cray Fortran : 27 source lines Cray Fortran : 1 errors, 0 warnings, 0 other messages, 0 ansi
fails another way	NVHPC 25.11, A100 separate NVHPC 25.11, A100 managed NVHPC 26.9, A100 separate NVHPC 26.9, A100 managed	show NVFORTRAN-S-0034-Syntax error at or near ( (cce-atomic-default-mem-order-acquire-release-rejected.f90: 4) 0 inform, 0 warnings, 1 severes, 0 fatal for gen_prog

Reproduce

CCE 19.0.0, MI300A unified

module load cce/19.0.0 craype-accel-amd-gfx942 rocm/6.4.3
module unload cray-mpich
ftn -fopenmp -O2 repro.f90 -o repro
HSA_XNACK=1 OMP_TARGET_OFFLOAD=mandatory ./repro

CCE 20.0.2, MI300A unified

module load cce/20.0.2 craype-accel-amd-gfx942 rocm/6.4.3
module unload cray-mpich
ftn -fopenmp -O2 repro.f90 -o repro
HSA_XNACK=1 OMP_TARGET_OFFLOAD=mandatory ./repro

CCE 21.0.3, MI300A unified

module load cce/21.0.3 craype-accel-amd-gfx942 rocm/7.2.0
module unload cray-mpich
ftn -fopenmp -O2 repro.f90 -o repro
HSA_XNACK=1 OMP_TARGET_OFFLOAD=mandatory ./repro

CCE 21.0.4, MI300A unified

module load cce/21.0.4 craype-accel-amd-gfx942 rocm/7.2.0
module unload cray-mpich
ftn -fopenmp -O2 repro.f90 -o repro
HSA_XNACK=1 OMP_TARGET_OFFLOAD=mandatory ./repro

AFAR 24.3.0, MI300A unified (runs correctly)

$AFAR/bin/amdflang -fopenmp --offload-arch=gfx942 -O2 repro.f90 -o repro
HSA_XNACK=1 OMP_TARGET_OFFLOAD=mandatory ./repro

Program (54 lines)

! # Draft finding: omp52-clause-atomic_default_mem_order-release on cce19
!
! - compiler: cce19
! - toolchain: cce19; arch: gfx942; machine: tuolumne; memory mode: unified; opt: -O2
! - program: catalog omp52-clause-atomic_default_mem_order-release (f90, version 52, sha256 4a88172afe9b3864)
! - expected: None (None; )
! - actual: rejected  (diagnostic: ftn-1725 ftn: ERROR GEN_PROG, File = ../../omp52-clause-atomic_default_mem_order-release.f90,
!   Line = 13, Column = 50 | Unexpected syntax while parsing the DIRECTIVE statement : "(seq_cst |)
! - verdict: compiler_bug by rule R11-compile-rejection: a legal program the compiler rejects with a diagnostic (or whose link fails
!   on symbols the compiler's own code needs, or whose compile does not finish) while another compiler family compiles it
! - reason: 
! - citations: RUL-COMPILE-TIME (rulings.md)
! - legality: legal (legal by construction: offload.engine.gen / c_gen / acc_gen check every program against the catalog rules
!   and the
!   offload scope as it is built (no compiler))
! - witnesses: none
! - withdrawn: none
!
! Generated by compliance.gen (OpenMP 5.2, free-form Fortran). Do not edit.
! id: omp52-clause-atomic_default_mem_order-release
! primary atom: omp.clause.atomic_default_mem_order.release
! legal: yes
! observable: no (requires only changes semantics: no checked device effect)
! ran_on_host: inside the target region of interest
! evidence: construct
! needs: none
! std: f2008
program gen_prog
  use omp_lib, only: omp_is_initial_device
  implicit none
  !$omp requires atomic_default_mem_order(release)
  integer, parameter :: n = 64
  integer, allocatable, target :: a(:), b(:)
  integer :: ref(n)
  integer :: i, host_flag
  logical :: ok
  allocate(a(n), b(n))
  do i = 1, n
    a(i) = i
    b(i) = 0
    ref(i) = 2*i + 1
  end do
  host_flag = 1
  !$omp target teams distribute parallel do map(to: a) map(from: b) map(tofrom: host_flag) &
  !$omp& default(none) shared(a, b, host_flag)
    do i = 1, n
      b(i) = 2*a(i) + 1
      if (i == 1) host_flag = merge(1, 0, omp_is_initial_device())
    end do
  !$omp end target teams distribute parallel do
  ok = all(b == ref)
  print '(a,i0,a,a)', 'RESULT ran_on_host=', host_flag, ' check=', merge('pass', 'fail', ok)
  deallocate(a, b)
end program gen_prog

Source in the repository

Something to add? Dispute its legality · Report it fixed in a newer release · Report a mistake on this page

Expected and observed

Observed where it behaves incorrectly

Warning:
 Headers and libraries from cray-libsci/25.03.0 will be ignored because depends on PE_MPICH which is unavailable..
  !$omp requires atomic_default_mem_order(release)
                                                 ^ 
ftn-1725 ftn: ERROR GEN_PROG, File = cce-atomic-default-mem-order-acquire-release-rejected.f90, Line = 4, Column = 50 
  Unexpected syntax while parsing the DIRECTIVE statement : "(seq_cst | acq_rel | relaxed)" was expected but found ")".
Cray Fortran : 27 source lines
Cray Fortran : 1 errors, 0 warnings, 0 other messages, 0 ansi

What the specification requires

The specification text this program relies on and the compiler is expected to support.

The same requirement as the issue catalog/cce-c-map-iterator-ice.

OpenMP 5.2 §3.2.6 p.67 l.6-8

An iterator modifier is a unique, complex modifier that defines a set of iterators, each of which is an iterator-identifier and an associated set of values.

OpenMP 5.2 §5.8.3 p.151 l.13-14

A list item in a map clause may reference any iterator-identifier defined in its iterator modifier.

Evidence

Same compiler, one change

atomic_default_mem_order(seq_cst) instead of (release): AFAR 24.3.0: correct; CCE 19.0.0: correct; CCE 20.0.2: correct; CCE 21.0.3: correct; CCE 21.0.4: correct

Control program

program gen_prog
  use omp_lib, only: omp_is_initial_device
  implicit none
  !$omp requires atomic_default_mem_order(seq_cst)
  integer, parameter :: n = 64
  integer, allocatable, target :: a(:), b(:)
  integer :: ref(n)
  integer :: i, host_flag
  logical :: ok
  allocate(a(n), b(n))
  do i = 1, n
    a(i) = i
    b(i) = 0
    ref(i) = 2*i + 1
  end do
  host_flag = 1
  !$omp target teams distribute parallel do map(to: a) map(from: b) map(tofrom: host_flag) &
  !$omp& default(none) shared(a, b, host_flag)
    do i = 1, n
      b(i) = 2*a(i) + 1
      if (i == 1) host_flag = merge(1, 0, omp_is_initial_device())
    end do
  !$omp end target teams distribute parallel do
  ok = all(b == ref)
  print '(a,i0,a,a)', 'RESULT ran_on_host=', host_flag, ' check=', merge('pass', 'fail', ok)
  deallocate(a, b)
end program gen_prog

Other compilers run it correctly

AFAR 24.3.0, GCC 16.2.0