Date: Thu, 30 Mar 2017 23:04:15 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Brooks Davis <brooks@freebsd.org> 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> Subject: Re: FYI: what it takes for RAM+swap to build devel/llvm40 with 4 processors or cores and WITH__DEBUG= (powerpc64 example) Message-ID: <7C9A1030-E489-489C-A17B-4981DE429FEA@FreeBSD.org> In-Reply-To: <20170330175519.GA34411@spindle.one-eyed-alien.net> References: <3EDEF0B7-59C5-4648-9737-6682E18645BC@dsl-only.net> <39C60316-F905-490D-B0AB-BC24D7F351A2@dsl-only.net> <7F94CE59-D2CC-4D6F-B1CD-FF3D1F8EDCE7@FreeBSD.org> <20170330170648.GA38004@FreeBSD.org> <B2BA1E9F-3B85-46AC-8FAF-32054D675102@FreeBSD.org> <20170330175519.GA34411@spindle.one-eyed-alien.net>
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[-- Attachment #1 --]
On 30 Mar 2017, at 19:55, Brooks Davis <brooks@freebsd.org> wrote:
>
> On Thu, Mar 30, 2017 at 07:26:19PM +0200, Dimitry Andric wrote:
...
>>
>> 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.
>
> I'm looking into improving WITH_DEBUG.
I stole the following method from graphics/darktable:
Index: devel/llvm40/Makefile
===================================================================
--- devel/llvm40/Makefile (revision 436685)
+++ devel/llvm40/Makefile (working copy)
@@ -236,6 +236,11 @@ NOT_FOR_ARCH= ia64
.include <bsd.port.pre.mk>
+.if defined(WITH_DEBUG)
+CMAKE_BUILD_TYPE= RelWithDebInfo
+STRIP=
+.endif
+
_CRTLIBDIR= ${LLVM_PREFIX:S|${PREFIX}/||}/lib/clang/${LLVM_RELEASE}/lib/freebsd
.if ${ARCH} == "amd64"
_COMPILER_RT_LIBS= \
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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