Messages in this thread | | | Date | Wed, 20 May 2015 10:53:34 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH] perf: fix wrong DEBUG configuration |
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Em Wed, May 20, 2015 at 03:29:37PM +0200, Martin Liška escreveu: > On 05/20/2015 03:17 PM, Arnaldo Carvalho de Melo wrote: > >Em Wed, May 20, 2015 at 03:07:39PM +0200, Martin Liška escreveu: > >>Currently, GCC optimizes -O6 same as -O3 level. Right optimize debugging > >>experience is given by passing -Og to compiler.
> >Is this is this -Og available in old gcc versions? When was it > >introduced? Do you know?
> GCC 4.8.0 is the first version capable of the option: https://gcc.gnu.org/gcc-4.8/changes.html. > That can be problematic, which GCC version do you support in linux/perf?
So the rule has been: What are the kernel requirements for the toolchain? tools/perf/ should build with that.
Looking at the kernel's README, that is...
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COMPILING the kernel:
- Make sure you have at least gcc 3.2 available. For more information, refer to Documentation/Changes.
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The oldest toolchain I personally test from time to time is:
[acme@rhel5 ~]$ rpm -q gcc make binutils gcc-4.1.2-55.el5 make-3.81-3.el5 binutils-2.17.50.0.6-26.el5 [acme@rhel5 ~]$
- Arnaldo
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