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On Wed, May 29, 2013 at 9:24 AM, Martin Guy-2 [via Sourceware.org] < ml-node+s1504n233506h65@n7.nabble.com> wrote: > On 28 May 2013 19:31, gabx <[hidden email]<http://user/SendEmail.jtp?type=node&node=233506&i=0>> > wrote: > > Thank you all for these details. It is my first deep journey in the > > toolchain world, and as described on the ct-ng website, it can quickly > > become a nightmare. > > Not a nightmare. It's just that compilers are complex. cross-compiler > even more so. > > > I guess my CCX_FLAGS is then a non-sense : > > Not nonsense. You just have a super-fast cross-compiler that generates > the same code as a regular one! > > > Which flags would you keep ? > > My toolchain is aimed at building android kernel and rom for the Google > LG > > nexus 4. > > It depends what you are trying to achieve. If it's just a few % extra > speed, try -Os or -O2/-O3. I think the manual says they optimise for > minimum code size or maximum speed without/with large increases in > compile time and code size, respectively. > Beyond telling the compiler the instruction set it can use, which > should correspond to the silicon in your target device, there is only > a few % speed to be had by juggling with magic options, and which help > and which make it worse or produce non-working code depend on the > specific program you are compiling. > > M > > > Thank you Martin. The unique goal of this toolchain is to build android kernel and rom with gcc 4.8 and some optimization flags for the Google LG nexus 4 (armv7-a rev2) -- View this message in context: http://sourceware-org.1504.n7.nabble.com/gcc-CXX-FLAGS-tp233249p233515.html Sent from the Sourceware - crossgcc list mailing list archive at Nabble.com. -- For unsubscribe information see http://sourceware.org/lists.html#faq
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