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add arch option to scons build command #33

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Merged
vincefn merged 1 commit into from
Aug 25, 2026
+10 −0
Merged

add arch option to scons build command #33

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8 changes: 8 additions & 0 deletions SConstruct
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Original file line number Diff line number Diff line change
Expand Up @@ -133,6 +133,14 @@ vars.Add(BoolVariable(
vars.Add(BoolVariable(
'with_shared_cctbx',
'compile and link with the shared cctbx library', False))
vars.Add(
'arch',
'target CPU passed to -march in the \'fast\' build. Empty (the default) means '
'no -march => maximum portability. Set \'x86-64-v3\' for a portable AVX2/FMA '
'build (Intel Haswell 2013+, AMD Zen 2017+), \'native\' for a machine-specific '
'build, or \'x86-64-v4\' for AVX-512. Also settable via the OBJCRYST_ARCH '
'environment variable.',
os.environ.get('OBJCRYST_ARCH', ''))

vars.Update(env)
env.Help(MY_SCONS_HELP % vars.GenerateHelpText(env))
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2 changes: 2 additions & 0 deletions src/SConscript
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Expand Up @@ -44,6 +44,8 @@ else:
# g++ options
env.PrependUnique(CCFLAGS=['-Wall'])
fast_optimflags = ['-ffast-math']
if env.get('arch'):
fast_optimflags.append('-march=' + env['arch'])

# Configure build variants
if env['build'] == 'debug':
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