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build: add -mbranch-protection=bti (aarch64) to hardening flags #28459

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Merged
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Oct 13, 2023
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build: add -mbranch-protection=bti (aarch64) to hardening flags #28459

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5 changes: 5 additions & 0 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -964,6 +964,11 @@ if test "$use_hardening" != "no"; then
;;
esac

case $host in
*aarch64*)
AX_CHECK_COMPILE_FLAG([-mbranch-protection=bti], [HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -mbranch-protection=bti"])
;;
esac

dnl When enable_debug is yes, all optimizations are disabled.
dnl However, FORTIFY_SOURCE requires that there is some level of optimization, otherwise it does nothing and just creates a compiler warning.
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