Re: Compile FreeBSD kernel with gcc48

[Alie Tan]

>
> On 2012-11-11 10:59, Alie Tan wrote:
> > Anyone have experience compiling FreeBSD kernel with gcc48
> >
> > I have tried it but no success with this in src.conf
> >
> > C= /usr/local/bin/gcc48
> > CXX= /usr/local/bin/g++48
> > CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes
> > \-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual
> > \-Wno-pointer-sign -D__FreeBSD_cc_version=0 \-Wno-unused-function
> > -Wno-inline -Wno-format \-Wno-uninitialized -Wno-array-bounds
> > -Wno-missing-prototypes
> > NO_WERROR= 1
>
> Last time I tried, I could get it to build with a gcc 4.8 snapshot, but
> it failed to boot.  I did not investigate a great deal, but it looked a
> lot like some sort of optimization bug.  Note that gcc 4.8 is still
> experimental, so problems like this can be expected.
>
> However, with gcc 4.7.1, which is a released version, the kernel did
> build, and even boot.  With that kernel booted, I timed how long a "make
> -j8 buildworld" took, compared to booting with kernels compiled by gcc
> in base (v4.2.1) and clang in base (v3.2), on different optimization
> settings.  The raw results are here:
>
> http://www.andric.com/freebsd/perftest/perftest-kernel-2012-09-25b.txt
>
> Summary:
> - Kernels compiled with clang 3.2 at -O2 are ~8% faster in system time
>than kernels compiled with gcc 4.2.1 at -O2.
> - Kernels compiled with clang 3.2 at -O2 perform equally to kernels
>compiled with gcc 4.7 at -O2, there is no significant difference.
> - Kernels compiled with gcc 4.7 at -O3 have a slight advantage in system
>time (~3.6%) against kernels compiled with clang 3.2 at -O2.
> (I did not test a kernel compiled with clang 3.2 at -O3.)
>
>
> > Another question, is there any benchmark for LLVM/Clang vs gcc45, gcc46,
> > gcc47 or gcc48?
>
> As said, I only tested clang 3.2 against gcc 4.2 from base, and gcc
> 4.7.1 (hand-built, since the version from ports is inexplicably some
> random snapshot, not a released version).
>
> If anybody is extremely interested in more results, they should sponsor
> some fast hardware, and donate it to the FreeBSD Project. ;-)



No idea why since there is no compilation error. It stops at this point:

/usr/local/bin/gcc48  -O2 -pipe  -O3 -fno-strict-aliasing -pipe
-funroll-loops -I/usr/src/lib/libc/include
-I/usr/src/lib/libc/../../include -I/usr/src/lib/libc/amd64 -DNLS
-D__DBINTERFACE_PRIVATE -I/usr/src/lib/libc/../../contrib/gdtoa -DINET6
-I/usr/obj/usr/src/lib/libc -I/usr/src/lib/libc/resolv -D_ACL_PRIVATE
-DPOSIX_MISTAKE -I/usr/src/lib/libc/../../contrib/tzcode/stdtime
-I/usr/src/lib/libc/stdtime -I/usr/src/lib/libc/locale -DBROKEN_DES
-DPORTMAP -DDES_BUILTIN -I/usr/src/lib/libc/rpc -DYP -DNS_CACHING
-DSYMBOL_VERSIONING -std=gnu99 -fstack-protector -Wall -Wredundant-decls
-Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith
-Winline -Wcast-qual -Wno-pointer-sign -D__FreeBSD_cc_version=81
-Wno-unused-function -Wno-inline -Wsystem-headers -Wall -Wno-format-y2k
-Wno-uninitialized -Wno-pointer-sign -c nslexer.c -o nslexer.o
In file included from /usr/src/lib/libc/net/nslexer.l:49:0:
/usr/src/lib/libc/../../include/nsswitch.h:236:14: warning: redundant
redeclaration of '_nsyylineno' [-Wredundant-decls]
 extern int   _nsyylineno;


And waited for couple of hours still hanging at that point with gcc48


Regards,
Alie T
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Re: Compile FreeBSD kernel with gcc48

[Dimitry Andric]

On 2012-11-11 10:59, Alie Tan wrote:

Anyone have experience compiling FreeBSD kernel with gcc48

I have tried it but no success with this in src.conf

C= /usr/local/bin/gcc48
CXX= /usr/local/bin/g++48
CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes
\-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual
\-Wno-pointer-sign -D__FreeBSD_cc_version=0 \-Wno-unused-function
-Wno-inline -Wno-format \-Wno-uninitialized -Wno-array-bounds
-Wno-missing-prototypes
NO_WERROR= 1


Last time I tried, I could get it to build with a gcc 4.8 snapshot, but
it failed to boot.  I did not investigate a great deal, but it looked a
lot like some sort of optimization bug.  Note that gcc 4.8 is still
experimental, so problems like this can be expected.

However, with gcc 4.7.1, which is a released version, the kernel did
build, and even boot.  With that kernel booted, I timed how long a "make
-j8 buildworld" took, compared to booting with kernels compiled by gcc
in base (v4.2.1) and clang in base (v3.2), on different optimization
settings.  The raw results are here:

http://www.andric.com/freebsd/perftest/perftest-kernel-2012-09-25b.txt

Summary:
- Kernels compiled with clang 3.2 at -O2 are ~8% faster in system time
  than kernels compiled with gcc 4.2.1 at -O2.
- Kernels compiled with clang 3.2 at -O2 perform equally to kernels
  compiled with gcc 4.7 at -O2, there is no significant difference.
- Kernels compiled with gcc 4.7 at -O3 have a slight advantage in system
  time (~3.6%) against kernels compiled with clang 3.2 at -O2.
(I did not test a kernel compiled with clang 3.2 at -O3.)



Another question, is there any benchmark for LLVM/Clang vs gcc45, gcc46,
gcc47 or gcc48?


As said, I only tested clang 3.2 against gcc 4.2 from base, and gcc
4.7.1 (hand-built, since the version from ports is inexplicably some
random snapshot, not a released version).

If anybody is extremely interested in more results, they should sponsor
some fast hardware, and donate it to the FreeBSD Project. ;-)
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Re: Compile FreeBSD kernel with gcc48

[Andriy Gapon]

on 11/11/2012 14:09 Garrett Cooper said the following:
> On Sun, Nov 11, 2012 at 4:07 AM, Andriy Gapon  > wrote:
> 
> on 11/11/2012 12:26 Garrett Cooper said the following:
> > On Sun, Nov 11, 2012 at 1:59 AM, Alie Tan  > wrote:
[snip]
> >> -Wno-format
[snip]
> >> NO_WERROR= 1
[snip]
> WERROR=
[snip]
> 
> -fformat-extensions ?

The above should take care of it.

-- 
Andriy Gapon
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Re: Compile FreeBSD kernel with gcc48

[Garrett Cooper]

On Sun, Nov 11, 2012 at 4:07 AM, Andriy Gapon  wrote:

> on 11/11/2012 12:26 Garrett Cooper said the following:
> > On Sun, Nov 11, 2012 at 1:59 AM, Alie Tan  wrote:
> >
> >> Hi,
> >>
> >> Anyone have experience compiling FreeBSD kernel with gcc48
> >>
> >> I have tried it but no success with this in src.conf
>
> It would be more productive to detail "no success".
>
> >> C= /usr/local/bin/gcc48
> >> CXX= /usr/local/bin/g++48
> >> CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes
> >> \-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual
> >> \-Wno-pointer-sign -D__FreeBSD_cc_version=0 \-Wno-unused-function
> >> -Wno-inline -Wno-format \-Wno-uninitialized -Wno-array-bounds
> >> -Wno-missing-prototypes
> >> NO_WERROR= 1
> >>
> >> Another question, is there any benchmark for LLVM/Clang vs gcc45, gcc46,
> >> gcc47 or gcc48?
> >>
> >
> > Uh, probably won't work because of FreeBSD modifications to gcc not being
> > present in upstream IIRC...
>
> Which exact modifications do you have in mind?
> I was able to compile the kernel with gcc46.
>
> I used these settings:
>
> CC= /usr/local/bin/gcc46
> CXX=/usr/local/bin/g++46
> AS= /usr/local/bin/as
> LD= /usr/local/bin/ld
> NO_WERROR=yes
> WERROR=
>
> CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs
> -Wstrict-prototypes \
> -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
> -Wno-pointer-sign -D__FreeBSD_cc_version=81 \
> -Wno-unused-function -Wno-inline
>
> I guess that perhaps 'WERROR=' made the difference.
>

-fformat-extensions ?
-Garrett
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Re: Compile FreeBSD kernel with gcc48

[Andriy Gapon]

on 11/11/2012 12:26 Garrett Cooper said the following:
> On Sun, Nov 11, 2012 at 1:59 AM, Alie Tan  wrote:
> 
>> Hi,
>>
>> Anyone have experience compiling FreeBSD kernel with gcc48
>>
>> I have tried it but no success with this in src.conf

It would be more productive to detail "no success".

>> C= /usr/local/bin/gcc48
>> CXX= /usr/local/bin/g++48
>> CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes
>> \-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual
>> \-Wno-pointer-sign -D__FreeBSD_cc_version=0 \-Wno-unused-function
>> -Wno-inline -Wno-format \-Wno-uninitialized -Wno-array-bounds
>> -Wno-missing-prototypes
>> NO_WERROR= 1
>>
>> Another question, is there any benchmark for LLVM/Clang vs gcc45, gcc46,
>> gcc47 or gcc48?
>>
> 
> Uh, probably won't work because of FreeBSD modifications to gcc not being
> present in upstream IIRC...

Which exact modifications do you have in mind?
I was able to compile the kernel with gcc46.

I used these settings:

CC= /usr/local/bin/gcc46
CXX=/usr/local/bin/g++46
AS= /usr/local/bin/as
LD= /usr/local/bin/ld
NO_WERROR=yes
WERROR=

CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
-Wno-pointer-sign -D__FreeBSD_cc_version=81 \
-Wno-unused-function -Wno-inline

I guess that perhaps 'WERROR=' made the difference.
-- 
Andriy Gapon
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Re: Compile FreeBSD kernel with gcc48

[Garrett Cooper]

On Sun, Nov 11, 2012 at 1:59 AM, Alie Tan  wrote:

> Hi,
>
> Anyone have experience compiling FreeBSD kernel with gcc48
>
> I have tried it but no success with this in src.conf
>
> C= /usr/local/bin/gcc48
> CXX= /usr/local/bin/g++48
> CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes
> \-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual
> \-Wno-pointer-sign -D__FreeBSD_cc_version=0 \-Wno-unused-function
> -Wno-inline -Wno-format \-Wno-uninitialized -Wno-array-bounds
> -Wno-missing-prototypes
> NO_WERROR= 1
>
> Another question, is there any benchmark for LLVM/Clang vs gcc45, gcc46,
> gcc47 or gcc48?
>

Uh, probably won't work because of FreeBSD modifications to gcc not being
present in upstream IIRC...
-Garrett
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Compile FreeBSD kernel with gcc48

[Alie Tan]

Hi,

Anyone have experience compiling FreeBSD kernel with gcc48

I have tried it but no success with this in src.conf

C= /usr/local/bin/gcc48
CXX= /usr/local/bin/g++48
CWARNFLAGS= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes
\-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual
\-Wno-pointer-sign -D__FreeBSD_cc_version=0 \-Wno-unused-function
-Wno-inline -Wno-format \-Wno-uninitialized -Wno-array-bounds
-Wno-missing-prototypes
NO_WERROR= 1

Another question, is there any benchmark for LLVM/Clang vs gcc45, gcc46,
gcc47 or gcc48?

Regards,
Alie T
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