[cfe-dev] "File too big/too many sections" when building Registry.cpp in MSYS2 Environment

[kyra via cfe-dev]

1. Big-obj support in Binutils was absolutely broken till recently (see 
my ticket https://sourceware.org/bugzilla/show_bug.cgi?id=19440).
Thus you need relatively fresh version of binutils to get things working 
(and they really work now).

2. Binutils do *not* support big-obj for 32-bit COFF target, thus it is 
*impossible* to debug build 32-bit hosted clang with GNU toolchain.

3. I believe, we should pay more attention to support self-hosted 
mingw-w64 clang, I maintain a couple of patches which allow me to build 
it, but I never tried to publish them, because I saw no interest. Btw, 
that recent LLVM patch introducing big-obj switch 
(https://github.com/llvm-mirror/llvm/commit/e1c9f504c6810be782714b8b39f11579e50fa5c7) 
also breaks self-hosted clang because gnu clang driver doesn't 
understand -Wa,-mbig-obj option. AFAIUI, LLVM handles COFF format 
automatically, selecting bigobj format if necessary, and msvc clang 
driver simply ignores '/bigobj' flag. I have a patch fixing gnu driver too.

Kyra

On 02.01.2017 4:32, William D. Jones via cfe-dev wrote:
> Did you cross-compile for MinGW? I've noticed that with the new 
> change, native compile, Registry.cpp now compiles, but attempting to link
> bin\clangDynamicASTMatchers.dll causes a link step that takes over 90 
> minutes (!!) before bombing with an excessive number of undefined 
> symbols. So many, that I cannot even copy and paste them all from my 
> scrollback. The linker cannot find any of the symbols from Registry.cpp.
>
> It is dawning on me that building a Debug build of Clang/LLVM on 
> Windows is impractical/development seems to mainly be done w/ gold on 
> Linux to avoid linker woes.
>
> -----Original Message----- From: William D. Jones via cfe-dev
> Sent: Saturday, December 31, 2016 7:38 PM
> To: Reid Kleckner
> Cc: cfe-dev at lists.llvm.org
> Subject: Re: [cfe-dev] "File too big/too many sections" when 
> buildingRegistry.cpp in MSYS2 Environment
>
> Sorry for the delay. I noticed that you pass the assembler options for 
> only
> 64-bit builds. Is there any harm for enabling the flags for 32-bit 
> builds as
> well? The 64-bit MinGW build appears to be broken on my machine (gcc 
> 5.3.0);
> LTO.dll spent 30 minutes compiling before I manually disabled the build.
>
> From: Reid Kleckner
> Sent: Thursday, December 22, 2016 2:30 PM
> To: William D. Jones
> Cc: cfe-dev
> Subject: Re: [cfe-dev] "File too big/too many sections" when building
> Registry.cpp in MSYS2 Environment
>
> To follow up, r290358 should fix this.
>
> -- 
> William D. Jones
> thor0505 at comcast.net
>
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> -- 
> William D. Jones
> thor0505 at comcast.net
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