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cc-wrapper/add-hardening.sh: always unset _FORTIFY_SOURCE before re-s… #193871

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Oct 8, 2022
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cc-wrapper/add-hardening.sh: always unset _FORTIFY_SOURCE before re-s… #193871

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4 changes: 3 additions & 1 deletion pkgs/build-support/cc-wrapper/add-hardening.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,9 @@ for flag in "${!hardeningEnableMap[@]}"; do
case $flag in
fortify)
if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling fortify >&2; fi
hardeningCFlags+=('-O2' '-D_FORTIFY_SOURCE=2')
# Use -U_FORTIFY_SOURCE to avoid warnings on toolchains that explicitly
# set -D_FORTIFY_SOURCE=0 (like 'clang -fsanitize=address').
hardeningCFlags+=('-O2' '-U_FORTIFY_SOURCE' '-D_FORTIFY_SOURCE=2')
;;
stackprotector)
if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling stackprotector >&2; fi
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