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build: add -mbranch-protection=bti to aarch64 hardening flags

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This is a simpler (less hardening) version of #24123.
Scoped to aarch64 to avoid unused command line option warnings when
building on x86_64.

Related to #19075.
This commit is contained in:
fanquake 2021-11-18 14:12:47 +08:00
parent 04265ba937
commit 61a6c3b0e9
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5
configure.ac
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@ -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.