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Merge bitcoin/bitcoin#27061: doc: Document affected gcc versions for -fstack-reuse=none workaround

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fa83005a26 doc: Document affected gcc versions for -fstack-reuse=none workaround (MarcoFalke)

Pull request description:

  gcc version(s) 11 and prior won't be fixed, looking at the activity in the bug report. So it seems best to just document gcc 12.1+ as fixed, so that in the future the workaround can be removed once the minimum compiler is gcc12.1.

ACKs for top commit:
  fanquake:
    ACK fa83005a26
  hebasto:
    re-ACK fa83005a26

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fanquake 2023-02-08 14:58:16 +00:00
commit 7b850bc2a1
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configure.ac
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@ -935,7 +935,9 @@ if test "$TARGET_OS" != "windows"; then
AX_CHECK_COMPILE_FLAG([-fPIC], [PIC_FLAGS="-fPIC"])
fi
dnl All versions of gcc that we commonly use for building are subject to bug
dnl Versions of gcc prior to 12.1 (commit
dnl https://github.com/gcc-mirror/gcc/commit/551aa75778a4c5165d9533cd447c8fc822f583e1)
dnl are subject to a bug, see the gccbug_90348 test case and
dnl https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90348. To work around that, set
dnl -fstack-reuse=none for all gcc builds. (Only gcc understands this flag)
AX_CHECK_COMPILE_FLAG([-fstack-reuse=none], [HARDENED_CXXFLAGS="$HARDENED_CXXFLAGS -fstack-reuse=none"])