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Merge bitcoin/bitcoin#28459: build: add -mbranch-protection=bti
(aarch64) to hardening flags
61a6c3b0e9a8dab5c5f845af4becde817539133c build: add `-mbranch-protection=bti` to aarch64 hardening flags (fanquake) Pull request description: This is a simpler (less hardening) version of https://github.com/bitcoin/bitcoin/pull/24123. You can inspect binaries using `readelf -n`, and look for BTI in a `.note.gnu.property`. i.e ```bash readelf -n src/bitcoin-cli Displaying notes found in: .note.gnu.property Owner Data size Description GNU 0x00000010NT_GNU_PROPERTY_TYPE_0 Properties: AArch64 feature: BTI ``` Related to https://github.com/bitcoin/bitcoin/issues/19075. ACKs for top commit: TheCharlatan: utACK 61a6c3b0e9a8dab5c5f845af4becde817539133c Tree-SHA512: 64504de44e91d853165daf4111dca905d8eb9ef3f4bfb0d447c677b02c9100dbd56f13e6fe6539fb06c2343a094229591ac5d1bd9e184b32b512c0ac3f9bac36
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@ -981,6 +981,11 @@ if test x$use_hardening != xno; then
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;;
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esac
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case $host in
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*aarch64*)
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AX_CHECK_COMPILE_FLAG([-mbranch-protection=bti], [HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -mbranch-protection=bti"])
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;;
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esac
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dnl When enable_debug is yes, all optimizations are disabled.
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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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