(oops, forgot to reply-all) ---------- Forwarded message ---------- From: David Blaikie <dblai...@gmail.com> Date: Fri, Jan 8, 2016 at 10:51 AM Subject: Re: r256287 - Document that we recommend to turn off -gmodules when building a static To: Adrian Prantl <apra...@apple.com>
On Fri, Jan 8, 2016 at 8:34 AM, Adrian Prantl <apra...@apple.com> wrote: > > On Jan 7, 2016, at 6:54 PM, David Blaikie <dblai...@gmail.com> wrote: > > Presumably this only applies when using implicit modules builds, not when > using explicit modules builds. (though I'm not sure what the current > behavior of -gmodules is with explicit modules, maybe it's > untested/broken/etc anyway) > > > Why would explicit modules be any different? Unless you distribute the > modules together with the static library (and ensure they end up in the > same location on the other machine) you would still run into the problem, > wouldn’t you? > Right - though it'd be a bit more obvious/easy (I would imagine/assume) to find and move that build product too, since it'd be in your build tree rather than an OS-wide cache somewhere else. > > -- adrian > > > On Tue, Dec 22, 2015 at 2:37 PM, Adrian Prantl via cfe-commits < > cfe-commits@lists.llvm.org> wrote: > >> Author: adrian >> Date: Tue Dec 22 16:37:22 2015 >> New Revision: 256287 >> >> URL: http://llvm.org/viewvc/llvm-project?rev=256287&view=rev >> Log: >> Document that we recommend to turn off -gmodules when building a static >> library for distribution to other machines on the clang man page. >> >> Modified: >> cfe/trunk/docs/CommandGuide/clang.rst >> >> Modified: cfe/trunk/docs/CommandGuide/clang.rst >> URL: >> http://llvm.org/viewvc/llvm-project/cfe/trunk/docs/CommandGuide/clang.rst?rev=256287&r1=256286&r2=256287&view=diff >> >> ============================================================================== >> --- cfe/trunk/docs/CommandGuide/clang.rst (original) >> +++ cfe/trunk/docs/CommandGuide/clang.rst Tue Dec 22 16:37:22 2015 >> @@ -262,7 +262,12 @@ Code Generation Options >> Generate debug information that contains external references to >> types defined in clang modules or precompiled headers instead of >> emitting redundant debug type information into every object file. >> - This option implies `-fmodule-format=obj`. >> + This option implies :option:`-fmodule-format=obj`. >> + >> + This option should not be used when building static libraries for >> + distribution to other machines because the debug info will contain >> + references to the module cache on the machine the object files in >> + the library were built on. >> >> .. option:: -fstandalone-debug -fno-standalone-debug >> >> >> >> _______________________________________________ >> cfe-commits mailing list >> cfe-commits@lists.llvm.org >> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits >> > > >
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