Date: Mon, 27 Mar 2017 14:53:39 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Mark Millard <markmi@dsl-only.net> Cc: FreeBSD Ports <freebsd-ports@freebsd.org>, FreeBSD PowerPC ML <freebsd-ppc@freebsd.org>, FreeBSD Toolchain <freebsd-toolchain@freebsd.org>, FreeBSD Current <freebsd-current@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: <F73D89C4-4E7F-469E-8613-17427231E5C0@FreeBSD.org> In-Reply-To: <45E32F4F-A238-47AA-8E1E-7AD4D9E857D9@dsl-only.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> <45E32F4F-A238-47AA-8E1E-7AD4D9E857D9@dsl-only.net>
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[-- Attachment #1 --]
On 27 Mar 2017, at 12:25, Mark Millard <markmi@dsl-only.net> wrote:
>
> On 2017-Mar-27, at 2:41 AM, Dimitry Andric <dim@FreeBSD.org> wrote:
>> On 26 Mar 2017, at 23:36, Mark Millard <markmi@dsl-only.net> wrote:
...
>>> Installed packages to be REMOVED:
>>> llvm40-4.0.0.r4
>>>
>>> Number of packages to be removed: 1
>>>
>>> The operation will free 49 GiB.
>>
>> Yes, this is big. But there is no real need to build the llvm ports
>> with debug information, unless you want to hack on llvm itself. And
>> in that case, you are better served by a Subversion checkout or Git
>> clone from upstream instead.
...
> Historically unless something extreme like this ends up
> involved I build everything using WITH_DEBUG= or explicit
> -g's in order to have better information on any failure.
The problem with the ports implementation of WITH_DEBUG is that it
always disables all optimizations, without a possibility to override.
Which bloats the resulting object files, libraries and executables, and
especially so for large C++ projects such as LLVM.
I can recommend the following workaround. If you want to build a port
with optimizations disabled, you can always pass -O0 in CFLAGS.
-Dimitry
Index: Mk/bsd.port.mk
===================================================================
--- Mk/bsd.port.mk (revision 436685)
+++ Mk/bsd.port.mk (working copy)
@@ -1646,7 +1646,7 @@ MAKE_ENV+= DONTSTRIP=yes
STRIP_CMD= ${TRUE}
.endif
DEBUG_FLAGS?= -g
-CFLAGS:= ${CFLAGS:N-O*:N-fno-strict*} ${DEBUG_FLAGS}
+CFLAGS:= ${CFLAGS} ${DEBUG_FLAGS}
.if defined(INSTALL_TARGET)
INSTALL_TARGET:= ${INSTALL_TARGET:S/^install-strip$/install/g}
.endif
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