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From: Dimitry Andric <dim@FreeBSD.org>
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Subject: Re: FYI: what it takes for RAM+swap to build devel/llvm40 with 4
processors or cores and WITH__DEBUG= (powerpc64 example)
Date: Thu, 30 Mar 2017 23:04:15 +0200
In-Reply-To: <20170330175519.GA34411@spindle.one-eyed-alien.net>
Cc: Alexey Dokuchaev <danfe@FreeBSD.org>,
FreeBSD Current <freebsd-current@freebsd.org>,
FreeBSD PowerPC ML <freebsd-ppc@freebsd.org>,
FreeBSD Toolchain <freebsd-toolchain@freebsd.org>,
FreeBSD Ports <freebsd-ports@freebsd.org>,
Johannes M Dieterich <jmd@FreeBSD.org>, Matthew Rezny <rezny@FreeBSD.org>
To: Brooks Davis <brooks@freebsd.org>
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On 30 Mar 2017, at 19:55, Brooks Davis <brooks@freebsd.org> wrote:
>=20
> On Thu, Mar 30, 2017 at 07:26:19PM +0200, Dimitry Andric wrote:
...
>>=20
>> As said, this is because of WITH_DEBUG. Don't use that for the llvm
>> ports, for now. It will also allow you to build them with much less =
RAM
>> in the machine: especially linking can take multiple GB when =
debuginfo
>> is enabled, and optimization is off.
>=20
> I'm looking into improving WITH_DEBUG.
I stole the following method from graphics/darktable:
Index: devel/llvm40/Makefile
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- devel/llvm40/Makefile (revision 436685)
+++ devel/llvm40/Makefile (working copy)
@@ -236,6 +236,11 @@ NOT_FOR_ARCH=3D ia64
.include <bsd.port.pre.mk>
+.if defined(WITH_DEBUG)
+CMAKE_BUILD_TYPE=3D RelWithDebInfo
+STRIP=3D
+.endif
+
_CRTLIBDIR=3D =
${LLVM_PREFIX:S|${PREFIX}/||}/lib/clang/${LLVM_RELEASE}/lib/freebsd
.if ${ARCH} =3D=3D "amd64"
_COMPILER_RT_LIBS=3D \
This appears to work for me.
> P.S. Somewhat off topice, but related. FAIR WARNING: the days of
> self-hosted 32-bit systems are numbered. Switching to lld from our
> ancient BFD linker will probably buy us some time, but I'd be =
surprised
> if you will be able to build LLVM+CLANG with a 2GB address space in 5
> years. The sooner people make their peace with this, the better.
Yes, with that above RelWithDebInfo change, GNU ld tends to use ~5G of
memory to link the larger llvm executables, so that is definitely beyond
i386, even if you run it in a jail on an amd64 host.
And if you would want to use link time optimization, the requirements
will increase even more...
-Dimitry
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