Date: Wed, 30 May 2018 20:13:44 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Dan Allen <danallen46@gmail.com> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: aesni on i386 w/gcc breaks 11-STABLE kernel build Message-ID: <D6487B52-3F3A-43D7-8632-1E41A05AD2E8@FreeBSD.org> In-Reply-To: <950C1018-1038-4103-A14B-2F252EE24069@gmail.com> References: <950C1018-1038-4103-A14B-2F252EE24069@gmail.com>
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On 30 May 2018, at 04:29, Dan Allen <danallen46@gmail.com> wrote:
>=20
> I am building FreeBSD 11 stable i386 on an old Pentium 4 machine. The =
clang/llvm build is just horrific in length, so I am substituting gcc by =
the appropriate /etc/src.conf defines such as WITHOUT_CLANG, =
WITHOUT_CLANG_BOOTSTRAP, WITH_GCC, WITH_GCC_BOOTSTRAP.
>=20
> After deleting clang via make delete-old in /usr/src, all of userland =
builds fine, but the kernel will not build due to the aesni module.
Hmm, I wonder how you managed to build world, as my build ends with the
following errors:
In file included from /usr/obj/usr/src/tmp/usr/include/ieeefp.h:13,
from /usr/src/lib/msun/tests/exponential_test.c:41:
/usr/obj/usr/src/tmp/usr/include/machine/ieeefp.h:111:1: error: =
"__fldcw" redefined
In file included from /usr/src/lib/msun/tests/exponential_test.c:35:
/usr/obj/usr/src/tmp/usr/include/fenv.h:98:1: error: this is the =
location of the previous definition
In file included from /usr/obj/usr/src/tmp/usr/include/ieeefp.h:13,
from /usr/src/lib/msun/tests/exponential_test.c:41:
/usr/obj/usr/src/tmp/usr/include/machine/ieeefp.h:112:1: error: =
"__fldenv" redefined
In file included from /usr/src/lib/msun/tests/exponential_test.c:35:
/usr/obj/usr/src/tmp/usr/include/fenv.h:99:1: error: this is the =
location of the previous definition
In file included from /usr/obj/usr/src/tmp/usr/include/ieeefp.h:13,
from /usr/src/lib/msun/tests/exponential_test.c:41:
/usr/obj/usr/src/tmp/usr/include/machine/ieeefp.h:114:1: error: =
"__fnstcw" redefined
In file included from /usr/src/lib/msun/tests/exponential_test.c:35:
/usr/obj/usr/src/tmp/usr/include/fenv.h:105:1: error: this is the =
location of the previous definition
In file included from /usr/obj/usr/src/tmp/usr/include/ieeefp.h:13,
from /usr/src/lib/msun/tests/exponential_test.c:41:
/usr/obj/usr/src/tmp/usr/include/machine/ieeefp.h:115:1: error: =
"__fnstenv" redefined
In file included from /usr/src/lib/msun/tests/exponential_test.c:35:
/usr/obj/usr/src/tmp/usr/include/fenv.h:104:1: error: this is the =
location of the previous definition
In file included from /usr/obj/usr/src/tmp/usr/include/ieeefp.h:13,
from /usr/src/lib/msun/tests/exponential_test.c:41:
/usr/obj/usr/src/tmp/usr/include/machine/ieeefp.h:116:1: error: =
"__fnstsw" redefined
In file included from /usr/src/lib/msun/tests/exponential_test.c:35:
/usr/obj/usr/src/tmp/usr/include/fenv.h:106:1: error: this is the =
location of the previous definition
*** [exponential_test.o] Error code 1
make[6]: stopped in /usr/src/lib/msun/tests
1 error
This is on a cleanly installed 11.2-BETA2, with the following in
/etc/src.conf:
MK_CLANG=3Dno
MK_CLANG_BOOTSTRAP=3Dno
MK_CLANG_EXTRAS=3Dno
MK_CLANG_FULL=3Dno
MK_CLANG_IS_CC=3Dno
MK_GCC=3Dyes
MK_GCC_BOOTSTRAP=3Dyes
MK_GNUCXX=3Dyes
MK_LLD=3Dno
MK_LLD_BOOTSTRAP=3Dno
MK_LLD_IS_LD=3Dno
MK_LLDB=3Dno
It looks like the macros in fenv.h and ieeefp.h are clashing, and Ngie
Cooper worked around it in
https://svnweb.freebsd.org/changeset/base/321483, but for some reason
only for clang.
But even after I applied a band-aid for this, it dies on another part:
--- all_subdir_stand ---
cc1: warnings being treated as errors
/usr/src/stand/i386/gptboot/gptboot.c: In function 'main':
/usr/src/stand/i386/gptboot/gptboot.c:258: warning: declaration of =
'autoboot' shadows a global declaration
/usr/src/stand/common/bootstrap.h:64: warning: shadowed declaration is =
here
*** [gptboot.o] Error code 1
make[5]: stopped in /usr/src/stand/i386/gptboot
1 error
Here the warning is right, as 'autoboot' is indeed shadowed, though it
may not be problematic in practice.
> The build break is due to compiling =
/usr/src/sys/crypto/aesni/aesni_ghash.c, which in turn #includes =
wmmintrin.h, emmintrin.h, and smmintrin.h which are all clang-specific =
headers.
In this case, you cannot compile it with gcc-in-base, since it is too
old to have the right intrinsics headers.
> I am rebuilding with MK_CRYPT=3Dno to see if this works around the =
problem, but it seems like perhaps just this one aesni module should not =
be built rather than all of CRYPT having to be disabled.
Probably only the module should be disabled, if the version of gcc is
too old. I have no idea where the needed intrinsics headers were added
upstream.
-Dimitry
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