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Suppress cc-wrapper --target mismatch warning on aarch64-darwin #237

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Merged
angerman merged 1 commit into from
Feb 27, 2026
Merged

Suppress cc-wrapper --target mismatch warning on aarch64-darwin #237

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10 changes: 10 additions & 0 deletions flake.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -369,6 +369,16 @@
# ''${NIX_ENFORCE_PURITY-1} keep the empty value instead of defaulting.
export NIX_ENFORCE_PURITY=

# Suppress the cc-wrapper --target mismatch warning on aarch64-darwin.
# GNU config.sub normalises to "aarch64-apple-darwin" while Apple's
# LLVM toolchain (and nix cc-wrapper's @defaultTarget@) uses
# "arm64-apple-darwin". GHC passes --target=aarch64-apple-darwin which
# triggers a noisy warning from cc-wrapper's add-clang-cc-cflags-before
# hook. The warning itself is harmless — clang handles both triples
# identically — but it pollutes stderr and causes thousands of GHC
# testsuite failures via unexpected compiler output.
export NIX_CC_WRAPPER_SUPPRESS_TARGET_WARNING=1

# Source stdenv's setup.sh to initialize the development
# environment. This runs all setup hooks (cc-wrapper,
# pkg-config-wrapper, etc.) and populates NIX_CFLAGS_COMPILE,
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