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Enable compilation on BE host machines #17428

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2 changes: 2 additions & 0 deletions docs/emcc.txt
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Expand Up @@ -635,6 +635,8 @@ Environment variables

* "EMCC_SKIP_SANITY_CHECK" [general]

* "EMCC_SUPPORT_BIG_ENDIAN" [general]

* "EM_IGNORE_SANITY" [general]

* "EM_CONFIG" [general]
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6 changes: 0 additions & 6 deletions src/settings.js
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Expand Up @@ -293,12 +293,6 @@ var DECLARE_ASM_MODULE_EXPORTS = true;
// [compile]
var INLINING_LIMIT = false;

// If set to 1, perform acorn pass that converts each HEAP access into a
// function call that uses DataView to enforce LE byte order for HEAP buffer;
// This makes generated JavaScript run on BE as well as LE machines. (If 0, only
// LE systems are supported). Does not affect generated wasm.
var SUPPORT_BIG_ENDIAN = false;

// Check each write to the heap, for example, this will give a clear
// error on what would be segfaults in a native build (like dereferencing
// 0). See runtime_safe_heap.js for the actual checks performed.
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9 changes: 9 additions & 0 deletions tools/settings.py
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Expand Up @@ -122,6 +122,15 @@ def read_js_settings(filename, attrs):
if 'EMCC_STRICT' in os.environ:
self.attrs['STRICT'] = int(os.environ.get('EMCC_STRICT'))

# If set, perform acorn pass that converts each HEAP access into a function
# call that uses DataView to enforce LE byte order for HEAP buffer; This
# makes generated JavaScript run on BE as well as LE machines. (If 0, only
# LE systems are supported). Does not affect generated wasm.
if 'EMCC_SUPPORT_BIG_ENDIAN' in os.environ:
self.attrs['SUPPORT_BIG_ENDIAN'] = int(os.environ.get('EMCC_SUPPORT_BIG_ENDIAN'))
else:
self.attrs['SUPPORT_BIG_ENDIAN'] = 0

# Special handling for LEGACY_SETTINGS. See src/setting.js for more
# details
for legacy in self.attrs['LEGACY_SETTINGS']:
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