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In my efforts to do a similar thing, the most effective way to set default flags in GCCturned out to be to create your own fake gcc wrapper, a tiny shell script called "gcc" (maybe also "gcc-4.8", "g++", "g++4.8") that calls the real gcc prefixing the supplied arguments with "-Ox" as described towards the end of martinwguy.co.uk/crunch/#UsingIt To override -O settings specified by makefiles and similar, (since most of them specify a -O flag) you may be able to get away with passing your "-O" flag last in the wrapper instead of first. If this doesn't work, you'll need to write a wrapper that loops through all the supplied gcc options eliminating those that begin with -O. M On 26/05/2013, Anthony Foiani <anthony.foiani@gmail.com> wrote: > Arnaud -- > > On Sat, May 25, 2013 at 4:59 PM, gabx <arnaud.gaboury@gmail.com> wrote: > >> Now I am still wondering if I need to pass again the flags when I build >> the >> android ROM or Kernel. > > Generally, yes. > > As Yann explained, the CT_CC_... variables are only used to build gcc > itself; they are not set when you use the built gcc to build other > projects. > > The "export ..." method should work, although you might want to try it > with the defaults first -- the Linux kernel, at least, should be > pretty smart about picking the right flags for the various hardware > targets. Picking other flags could very well lead to instability. > (There was an issue with "-Os" on some platforms for quite a while, > and that's even a fairly standard Linux kernel config option.) > > Also note that having a toolchain, or even a toolchain and a kernel, > is only a small part of building a fully distribution that can run on > a given platform. It's been covered here before, e.g.; > > http://sourceware.org/ml/crossgcc/2013-03/msg00008.html > > If this level of indirection makes you uncomfortable, you might see if > one of the "distribution building" tools (yocto, etc) has your > platform as a target. > > Either way, good luck! > > Best regards, > Anthony Foiani > > -- > For unsubscribe information see http://sourceware.org/lists.html#faq > > -- For unsubscribe information see http://sourceware.org/lists.html#faq
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