--=-Nq65m7sM2GaofoKVHHN0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On 2016-08-20 at 03:32 +0100, Howard Chu wrote: > [email protected] wrote: > >=20 > > Full_Name: Ivan Shapovalov > > Version: LMDB 0.9.18 > > OS: GNU/Linux > > URL: ftp://ftp.openldap.org/incoming/ivan-shapovalov-160820.patch > > Submission from: (NULL) (77.41.63.43) > >=20 > >=20 > > This patch adds a CMake buildsystem for LMDB, side-by-side with > > existing > > Makefile. > > It builds the same targets except coverage tests. >=20 > I am not a fan of CMake. Using it requires learning a whole new set > of=C2=A0 > documentation in addition to knowing the rules of Make. It comes with > a huge=C2=A0 > footprint of dependencies, and most people using it are misusing it. Mastering CMake is a lot easier than just learning to use Make... >=20 > >=20 > > Rationale for this change: CMake simplifies building of LMDB with > > non-standard > > toolchains > > such as Android NDK which only support their custom buildsystem and > > CMake (via > > a > > provided CMake toolchain configuration file). >=20 > Building for Android is trivial using e.g. agcc > https://gist.github.com/angad/1033321 This "agcc" has all flags hard-coded and simply does not work with third-party NDKs such as CrystaX NDK, which is exactly the point I'm trying to make. >=20 > >=20 > > This way, one does not need to extract required compiler flags > > manually. > > Moreover, this simplifies life for projects which use CMake and > > LMDB, because a > > proper CMake buildsystem allows to e. g. automatically pass > > transitive > > dependencies like pthreads to dependent projects. >=20 > Using agcc allows one to build for Android any project that simply > uses Make,=C2=A0 > which was 100% of them before CMake came along. This is false, as shown above. >=20 > Transitive dependencies like pthreads, which you have now embedded > into your=C2=A0 > CMakeLists.txt file, are actually compiler and platform dependent. > That's why=C2=A0 > the LMDB Makefile sets it in an overridable macro, that a programmer > can=C2=A0 > easily change on the commandline when invoking make on their chosen > build=C2=A0 > platform. True; this can be fixed. >=20 > Rejecting this patch and all future patches involving CMake. We will > not use=C2=A0 > this tool ourselves and we will not maintain files that it uses in > the LMDB=C2=A0 > source tree. If you don't like CMake out of personal motives, please just say so and don't cover it with made-up reasons. >=20 > If you need to integrate LMDB into a particular CMake-based project, > it's a=C2=A0 > lot simpler than this. E.g., > https://github.com/LMDB/bitmonero/blob/master/external/db_drivers/lib > lmdb/CMakeLists.txt >=20 > There's no reason to duplicate the entire Makefile when you're > embedding LMDB=C2=A0 > into some other project. This also shows the correct way to use CMake > and=C2=A0 > propagate threads dependencies. >=20 This file does not cover packaging and exporting targets, which is crucial when building multiple dependent projects in a staging tree (e. g. cross-compiling stuff). You see, it is easier to have a single correct build script in the upstream repo than to have many ad-hoc build scripts in each project, each deficient in its own regard. --=20 Ivan Shapovalov / intelfx / --=-Nq65m7sM2GaofoKVHHN0 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABCgAGBQJXt8N1AAoJEHveF8jk4w6dxNMP/0rbPnFVC6SP7ouTI8XhSdRq YmTl5f3clANv29PV5d6VpEROrbom0Exw07oBFIo4pN01Wo8/Gc48P/2NWZhO+IIZ qvhxTjatCIIZWviZprzQqQK/1VaH4F0IPA7vDHTZGu6G6OHHw70rKIWRh00x0K46 PZfmHZCN5akfdWVniX/Uc7RplAFyOzrnZZRfulfNPPCgwtwoenJ6mO0k4zWwJtP8 Yk/ipwHpXFAkuU5UQ0ObHJfmcCSebFEt53knDfUV7u2aBg24bFTMK0IfX3RuNN1D /fAV0WuoMS6HtTEfaOiUtlemjejxiOxCHFwHbe31Q2XgO3fSOuyv3qrdJCBKwJAX 8/MUbTf2RRA5pdAgiELEZ8o3mMuf0Gjs9BYC+Who5F+cy/3v0ga44MmRZwjtRZre 7h9GeqcgInNtRj9eYOeHPmSdLh8v/6RJRm7OQ/NkeFcKQdooMqd0vsbCWSWkdpyo rb3opd+mv8iRM6rVpEOyQDfWEguVIhemUB6g5/jyjO3tAcjIhwxnImvPTJXjNB9z OmTwnoVezixG8cJ6dYZYr3tSq7okBJd3DjTyxpB5VkWcp12+59vBLfkVrhEzA7Qw fMOPItN/2FymaLsh2kYv3jVLCl3r2hQ+LP2rPD4NWTC5MLcsxRCgJLfTvrALuRp0 IJCyUdAOf+xXzd6VF53n =Ln4x -----END PGP SIGNATURE----- --=-Nq65m7sM2GaofoKVHHN0--
