[Bug 205787] Can't compile freebsd srcs (/usr/src) with clang/llvm 3.8 and option -march=haswell

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205787

--- Comment #4 from Dimitry Andric <dim at FreeBSD.org> ---
Without any further information, I'm guessing that your bsd.compiler.mk does
not detect the compiler version properly, and that incorrect flags are being
used to compile boot2.  (The whole sys/boot area is very sensitive to the exact
optimization flags, it will almost always grow too large if they aren't
correct.)

Can you provide a log of the commands being used to compile everything under
/usr/src/sys/boot?  For example, by running "make clean" in there, and then
running make as usual, but redirected to a log file.

I'm also interested in the COMPILER_TYPE and COMPILER_VERSION detected by your
version of the build system.  E.g. in /usr/src, run:

make -V COMPILER_TYPE -V COMPILER_VERSION

and paste the output here.

Having said all that, I think you will run into multiple problems that will be
pretty tricky to solve, if you continue this way.  10.2-RELEASE is completely
frozen, and misses a lot of important fixes and updates which are in 10-STABLE,
making the task even more difficult.

Therefore, I think it is wisest to abandon this attempt.  You will most likely
not gain any significant performance advantage by compiling with
-march=haswell, as opposed to e.g. -march=corei7.

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