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[build] Fix script for conda MacOS #19749

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Merged
merged 1 commit into from
Sep 1, 2025
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[build] Fix script for conda MacOS #19749

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7 changes: 7 additions & 0 deletions cmake/scripts/std_modulemap_darwin_fix.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,13 @@ def main():
output_path = sys.argv[1]
sdk = get_sdk_path()
cpp_modulemap = os.path.join(sdk, "usr/include/c++/v1/module.modulemap")
if not os.path.exists(cpp_modulemap):
# Try again if we are running a conda build. conda-forge ships the MacOS SDK stripped of libc++.
# Instead, the standard libraries are shipped as a separate package which must be declared as a build
# dependency and thus ends up in the $BUILD_PREFIX path. For explanation, see
# https://conda-forge.zulipchat.com/#narrow/channel/516932-compilers/topic/Organisation.20of.20libc.2B.2B.20and.20SDKs.20on.20MacOS
if (os.environ.get("CONDA_BUILD", "0") == "1") and (os.environ.get("BUILD_PREFIX", None) is not None):
cpp_modulemap = os.path.join(os.environ["BUILD_PREFIX"], "include/c++/v1/module.modulemap")

if not os.path.exists(cpp_modulemap):
raise FileNotFoundError(f"Cannot find libc++ modulemap at {cpp_modulemap}")
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