| Message ID | CANLjY-n24iE_WtjG0669KYB=nxWfAB8HGu2V=zm9yR63L4rnUQ@mail.gmail.com |
|---|---|
| State | Superseded |
| Headers | show |
Michael, All, On Wednesday 14 November 2012 Michael Hope wrote: > Hi Yann, all. Someone recently spotted that the crosstool-NG based > Linaro builds took twice as long to compile code than the Ubuntu cross > compiler. [--SNIP--] > It turns out that GCC and the libraries are being built without > optimisation. [--SNIP--] > scripts: set default CFLAGS to optimise. > > Our extra CFLAGS override the product defaults, meaning that we build > without optimisation or debug. Be explicit and add these in. Can I have your SoB-line for that patch? > diff: > === modified file 'scripts/crosstool-NG.sh.in' > --- scripts/crosstool-NG.sh.in 2012-03-23 05:22:58 +0000 > +++ scripts/crosstool-NG.sh.in 2012-11-13 23:50:41 +0000 > @@ -488,7 +488,7 @@ > fi > > # Help gcc > - CT_CFLAGS_FOR_HOST= > + CT_CFLAGS_FOR_HOST="-O2 -g" > [ "${CT_USE_PIPES}" = "y" ] && CT_CFLAGS_FOR_HOST+=" -pipe" > CT_CFLAGS_FOR_HOST+=" ${CT_EXTRA_FLAGS_FOR_HOST}" Whoohoo! A one-liner that makes it twice faster! Love it :-) I'll look at it tomorrow. Also, I'd like to review your crosstool-NG fork, to see what we can bring back upstream, so you get less to maintain in your tree, so it makes it easier for you to follow upstream. That item's been basically sitting quite high on my TODO-list, but time being sparse, I always post-poned it. I'll try to get to it during this cycle. Do you think you could come up with a list of features / changesets you have in your tree that would be suitable for upstreaming? Also, I'm not used to bazaar. Can you point me to a quick cheat-sheet? Regards, Yann E. MORIN, sleepy at 01:27 AM... Zzzz....
=== modified file 'scripts/crosstool-NG.sh.in' --- scripts/crosstool-NG.sh.in 2012-03-23 05:22:58 +0000 +++ scripts/crosstool-NG.sh.in 2012-11-13 23:50:41 +0000 @@ -488,7 +488,7 @@ fi # Help gcc - CT_CFLAGS_FOR_HOST= + CT_CFLAGS_FOR_HOST="-O2 -g" [ "${CT_USE_PIPES}" = "y" ] && CT_CFLAGS_FOR_HOST+=" -pipe" CT_CFLAGS_FOR_HOST+=" ${CT_EXTRA_FLAGS_FOR_HOST}"
Hi Yann, all. Someone recently spotted that the crosstool-NG based Linaro builds took twice as long to compile code than the Ubuntu cross compiler. The thread starts here: http://lists.linaro.org/pipermail/linaro-toolchain/2012-October/002907.html and continues at: http://lists.linaro.org/pipermail/linaro-toolchain/2012-November/002922.html http://lists.linaro.org/pipermail/linaro-toolchain/2012-November/002932.html It turns out that GCC and the libraries are being built without optimisation. scripts/crosstool-NG.sh.in has: CT_CFLAGS_FOR_HOST= [ "${CT_USE_PIPES}" = "y" ] && CT_CFLAGS_FOR_HOST+=" -pipe" CT_CFLAGS_FOR_HOST+=" ${CT_EXTRA_FLAGS_FOR_HOST}" Setting USE_PIPES or EXTRA_FLAGS turns into passing CFLAGS to configure turns into overriding the package default of -O2 -g. This is my hack around: scripts: set default CFLAGS to optimise. Our extra CFLAGS override the product defaults, meaning that we build without optimisation or debug. Be explicit and add these in. diff: -- Michael -- For unsubscribe information see http://sourceware.org/lists.html#faq