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-rw-r--r--var/spack/repos/builtin/packages/gromacs/package.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/var/spack/repos/builtin/packages/gromacs/package.py b/var/spack/repos/builtin/packages/gromacs/package.py
index e273efedb8..1efb196e58 100644
--- a/var/spack/repos/builtin/packages/gromacs/package.py
+++ b/var/spack/repos/builtin/packages/gromacs/package.py
@@ -262,13 +262,16 @@ class Gromacs(CMakePackage):
('avx512', 'AVX_512') in simd_features):
simd_features.remove(('avx512', 'AVX_512'))
+ feature_set = False
for feature, flag in reversed(simd_features):
if feature in target:
options.append('-DGMX_SIMD:STRING={0}'.format(flag))
+ feature_set = True
break
# Fall back
- options.append('-DGMX_SIMD:STRING=None')
+ if not feature_set:
+ options.append('-DGMX_SIMD:STRING=None')
# Use the 'rtdscp' assembly instruction only on
# appropriate architectures