According to this, https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html#cross-compiling , you just need to set a few more variables for cross compilation.
In the old days, that could be done in the ebuild *.mk files under build-data and build-root. However, I believe ebuild was optimized for autotools, and I have not studied what has changed since cmake was instituted. Anyway, the magic originates in build-root/Makefile (unless some newer techniques are available.) Burt On Wed, Dec 19, 2018 at 10:40 AM Andrew Pinski <pins...@gmail.com> wrote: > On Wed, Dec 19, 2018 at 8:54 AM Damjan Marion via Lists.Fd.Io > <dmarion=me....@lists.fd.io> wrote: > > > > i > > > > On 19 Dec 2018, at 14:00, Saxena, Nitin <nitin.sax...@cavium.com> wrote: > > > > Hi Damjan, > > > > >>Somebody needs to spend a bit of time to teach CMake how to properly > cross-compile.... > > > > Correct me if I am wrong but I think cross-compilation support was there > before CMake transition. > > > > I guess so, never used it... > > I am still disappointed moving away from autotools. CMake has too > much junk science of getting it right; autotools just work for all of > these special cases. > Yes it is a bit slower to build with autotools but it makes cross > compiling and debugging what is going wrong with the build easier. > > > > > Also I am not finding capability to link VPP with externally compiled > dpdk? Am I correct or missing anything > > > > You can just specify -DCMAKE_INSTALL_PREFIX:PATH=..... to the tree where > dpdk tree is. > > That is what we do today with /opt/vpp/external/$(uname -m)/ > > Also it makes help messages from configure easier to find the needed > options including but not limited to the above. Having reading cmake > files in the past and autoconfig files, the autoconf is easier to > understand and understand how it works. Also autoconf is standard, > while cmake is very much unstandardized when it comes to finding > headers, etc. You need to pull in a library, here have a weird cmake > file which might or might not work. > > Thanks, > Andrew Pinski > > > > > -- > > Damjan > > > > -=-=-=-=-=-=-=-=-=-=-=- > > Links: You receive all messages sent to this group. > > > > View/Reply Online (#11694): https://lists.fd.io/g/vpp-dev/message/11694 > > Mute This Topic: https://lists.fd.io/mt/28800506/912176 > > Group Owner: vpp-dev+ow...@lists.fd.io > > Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [pins...@gmail.com] > > -=-=-=-=-=-=-=-=-=-=-=- > -=-=-=-=-=-=-=-=-=-=-=- > Links: You receive all messages sent to this group. > > View/Reply Online (#11695): https://lists.fd.io/g/vpp-dev/message/11695 > Mute This Topic: https://lists.fd.io/mt/28800506/541103 > Group Owner: vpp-dev+ow...@lists.fd.io > Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [bur...@gmail.com] > -=-=-=-=-=-=-=-=-=-=-=- >
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