Slow build with clang?
I have been building the Boost libraries with g++ for many years. Someone recommended trying Clang, so I downloaded 1.52.0 and built it first with g++ 4.5.1 on Fedora 14. Then I started a build with clang 3.3, and it is taking forever. I have not made any measurements, but it must be at least an order of magnitude slower than g++. The math library seems to take the longest, but maybe there are other slow-building libraries yet to come. Am I doing something wrong, or should I expect the clang build to be very slow? In myuser-config I have this: using clang : 3.3 : /directory_where_we_installed_clang/bin/clang :<compileflags>"-fPIC"<linkflags>"-fPIC" ; The command line is this: bin/bjam --user-config=myuser-config threading=multi instruction-set=core2 address-model=64 variant=release link=static,shared --stagedir=stageF14C clean The clang version is: clang version 3.3 (trunk 169541) (llvm/trunk 169537) The OS is Linux Fedora 14. -- Dick Hadsell 203-992-6320 Fax: 203-992-6001 Reply-to: hadsell@blueskystudios.com Blue Sky Studios http://www.blueskystudios.com 1 American Lane, Greenwich, CT 06831-2560
Is it possible you built Clang in Debug? If you don't build a release
version of Clang, everything is, indeed, very slow. I've made this
mistake, and I think it's really easy to do.
When I built boost 1.52.0 recently with a version of Clang very close to
3.2 it did not seem like it was building slowly to me. But I didn't
compare the build speed with g++, so maybe I don't know what I'm talking
about.
On Tue, Dec 11, 2012 at 4:28 PM, Richard Hadsell wrote: I have been building the Boost libraries with g++ for many years. Someone
recommended trying Clang, so I downloaded 1.52.0 and built it first with
g++ 4.5.1 on Fedora 14. Then I started a build with clang 3.3, and it is
taking forever. I have not made any measurements, but it must be at least
an order of magnitude slower than g++. The math library seems to take the
longest, but maybe there are other slow-building libraries yet to come. Am I doing something wrong, or should I expect the clang build to be very
slow? In myuser-config I have this: using clang : 3.3 : /directory_where_we_installed_**clang/bin/clang
:<compileflags>"-fPIC"<**linkflags>"-fPIC" ; The command line is this: bin/bjam --user-config=myuser-config threading=multi instruction-set=core2
address-model=64 variant=release link=static,shared --stagedir=stageF14C
clean The clang version is: clang version 3.3 (trunk 169541) (llvm/trunk 169537)
The OS is Linux Fedora 14. --
Dick Hadsell 203-992-6320 Fax: 203-992-6001
Reply-to: hadsell@blueskystudios.com
Blue Sky Studios http://www.blueskystudios.com
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On 12/11/2012 04:46 PM, Bill White wrote:
Is it possible you built Clang in Debug? If you don't build a release version of Clang, everything is, indeed, very slow. I've made this mistake, and I think it's really easy to do. Yes, it's very possible. A colleague built it for himself, and since it's installed in a directory named 'Debug+Asserts', you must be right. Thank you very much.
-- Dick Hadsell 203-992-6320 Fax: 203-992-6001 Reply-to: hadsell@blueskystudios.com Blue Sky Studioshttp://www.blueskystudios.com 1 American Lane, Greenwich, CT 06831-2560 Follow Blue Sky Studios on Facebook http://www.facebook.com/BlueSkyStudios and Twitter http://twitter.com/#%21/blueskystudios
On 11/12/12 23:13, Richard Hadsell wrote:
On 12/11/2012 04:46 PM, Bill White wrote:
Is it possible you built Clang in Debug? If you don't build a release version of Clang, everything is, indeed, very slow. I've made this mistake, and I think it's really easy to do. Yes, it's very possible. A colleague built it for himself, and since it's installed in a directory named 'Debug+Asserts', you must be right. Thank you very much.
You need to configure with --enable-optimized --disable-assertions.
I always build with cmake+ninja. I'm not sure what good ninja is doing for me, but it's really fast. CMake makes nice, if over elaborate, Eclipse projects for clang. On Tue, Dec 11, 2012 at 6:54 PM, Mathias Gaunard < mathias.gaunard@ens-lyon.org> wrote:
On 11/12/12 23:13, Richard Hadsell wrote:
On 12/11/2012 04:46 PM, Bill White wrote:
Is it possible you built Clang in Debug? If you don't build a release version of Clang, everything is, indeed, very slow. I've made this mistake, and I think it's really easy to do.
Yes, it's very possible. A colleague built it for himself, and since it's installed in a directory named 'Debug+Asserts', you must be right. Thank you very much.
You need to configure with --enable-optimized --disable-assertions.
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participants (3)
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Bill White -
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Richard Hadsell