Hallvard Breien Furuseth wrote:

On 23/01/15 18:10, hyc@symas.com wrote:

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LMDB should not be pulled separately from OpenLDAP. I.e., only the bundled version of LMDB should be used with a given version of OpenLDAP.

I've already had this conversation with the gentoo maintainers; they refuse to listen to reason. It's all their problem now.

Still, memalign() is a problem. mdb.c defines HAVE_MEMALIGN, but it may be wrong for the user to -D"HAVE_MEMALIGN" since that may omit whatever #include file declares it. <malloc/malloc.h> (some Apple stuff I think), <malloc.h> dunno what else.

We could drop memalign. malloc(desired space + 1 OS page), then adjust for alignment. On machines with a sane linear address space where we can tell alignment from the address, anyway.

Such an address space is already a requirement for LMDB, since mmaps are page-aligned.

On weirder hosts, you care about them, omit alignment altogether if posix_memalign is missing. And omit O_DIRECT/F_NOCACHE in mdb_env_copy2(). I gather those are why we need alignment.

Right.

Branch "mdb/memalign" in git://git.uio.no/u/hbf/openldap.git has draft code.

Still don't have time to check this myself, may have an opportunity tomorrow.

Daniel: You can try that branch, and configure with CPPFLAGS="-DMDB_MEMALIGN_METHOD=2".

I guess the preprocessor test should be "defined(a test for Darwin: __APPLE__, _MACOSX_ or..?)" and not __PPC__. PowerPC is an architecture, while features like posix_memalign are defined by compilers/operating systems. The macports issue disables mdb for Darwin. Or maybe not, I don't know Mac, Darwin, PPC or Gentoo, or if you just said this has been resolved, so I'll stay out of of that issue.

Right. I thought you (OP) were talking about Gentoo Linux on PPC, not MacOSX on PPC. Linux on PPC should be using the same glibc as any other architecture, and as such ought to already have posix_memalign.