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Populate CXX during builds to avoid calling the system toolchain #545

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Mar 5, 2025
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Populate CXX during builds to avoid calling the system toolchain #545

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3 changes: 3 additions & 0 deletions cpython-unix/build.py
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Original file line number Diff line number Diff line change
Expand Up @@ -101,6 +101,9 @@ def add_target_env(env, build_platform, target_triple, build_env):
env["HOST_CC"] = settings["host_cc"]
env["HOST_CXX"] = settings["host_cxx"]
env["CC"] = settings["target_cc"]
# We always set CXX, otherwise a build could bypass our toolchain
# accidentally, e.g., on macOS where `g++` links to the system clang.
env["CXX"] = settings.get("target_cxx", settings.get("host_cxx"))

if settings.get("bolt_capable"):
env["BOLT_CAPABLE"] = "1"
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