llvm dev - Sep 2018 - Can i reduce my clang/JIT app in size?

i want to integrate a C source JITer into my application but the 
resulting executables are too large

is it possible to reduce the resulting libs/exe some way?
current VS2017/svn build example: 
llvm-build\Release\bin\clang-interpreter.exe ~36MB

for now (that can change later)
- i want to jit simple c-code
- no std library or something
- x64 only
- no deep/full architecture optimization needed
- no c++/templates etc.

any ideas?

Have you tried building LLVM in MinSizeRelease and only enable X64 backend?
Other aspects might require some advanced modification to LLVM/Clang’s source
which I’m no professional with

Zhang
> 在 2018年9月19日，17:50，Dennis Luehring via llvm-dev <llvm-dev at
lists.llvm.org> 写道：
> 
> i want to integrate a C source JITer into my application but the resulting
executables are too large
> 
> is it possible to reduce the resulting libs/exe some way?
> current VS2017/svn build example:
llvm-build\Release\bin\clang-interpreter.exe ~36MB
> 
> for now (that can change later)
> - i want to jit simple c-code
> - no std library or something
> - x64 only
> - no deep/full architecture optimization needed
> - no c++/templates etc.
> 
> any ideas?
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

libClang’s EmitLLVMAction(or whatever its called) + LLVM’s MCJIT( skipping all
optimizations as a whole) should in theory IMHO achieve what you need. I’m not
sure if there are extra internal dependencies though.

Zhang
> 在 2018年9月19日，17:54，mayuyu.io via llvm-dev <llvm-dev at
lists.llvm.org> 写道：
> 
> Have you tried building LLVM in MinSizeRelease and only enable X64 backend?
> Other aspects might require some advanced modification to LLVM/Clang’s
source which I’m no professional with
> 
> Zhang
> 
>> 在 2018年9月19日，17:50，Dennis Luehring via llvm-dev <llvm-dev at
lists.llvm.org> 写道：
>> 
>> i want to integrate a C source JITer into my application but the
resulting executables are too large
>> 
>> is it possible to reduce the resulting libs/exe some way?
>> current VS2017/svn build example:
llvm-build\Release\bin\clang-interpreter.exe ~36MB
>> 
>> for now (that can change later)
>> - i want to jit simple c-code
>> - no std library or something
>> - x64 only
>> - no deep/full architecture optimization needed
>> - no c++/templates etc.
>> 
>> any ideas?
>> 
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> 
> 
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

>and only enable X64 backend?
im on Win7 x64

so i the CMaker parameter enables only the x64 backed

-DLLVM_TARGETS_TO_BUILD=host

will try MinSizeRelease

Am 19.09.2018 um 18:54 schrieb mayuyu.io:
> Have you tried building LLVM in MinSizeRelease and only enable X64 backend?
> Other aspects might require some advanced modification to LLVM/Clang’s
source which I’m no professional with
>
> Zhang
>
> > 在 2018年9月19日，17:50，Dennis Luehring via llvm-dev <llvm-dev at
lists.llvm.org> 写道：
> > 
> > i want to integrate a C source JITer into my application but the
resulting executables are too large
> > 
> > is it possible to reduce the resulting libs/exe some way?
> > current VS2017/svn build example:
llvm-build\Release\bin\clang-interpreter.exe ~36MB
> > 
> > for now (that can change later)
> > - i want to jit simple c-code
> > - no std library or something
> > - x64 only
> > - no deep/full architecture optimization needed
> > - no c++/templates etc.
> > 
> > any ideas?
> > 
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
>

36MB is quite small already. I guess you already built only one backend?
(-DLLVM_TARGETS_TO_BUILD=host) I don't think it will get much smaller.

Your requirements, however, sound like you could easily use a more
specialized compiler, like TinyCC? If your project is LGPL compatible, I
am sure you can make it codegen to a memory buffer. NativeJIT has good
data structures for that. The bigger task then is resolving relocations
and figuring out dependencies (especially on Windows). I guess you could
find all that in LLVM and use it without the entire engine behind.

Am 19.09.18 um 18:50 schrieb Dennis Luehring via
llvm-dev:
> i want to integrate a C source JITer into my application but the
> resulting executables are too large
>
> is it possible to reduce the resulting libs/exe some way?
> current VS2017/svn build example:
> llvm-build\Release\bin\clang-interpreter.exe ~36MB
>
> for now (that can change later)
> - i want to jit simple c-code
> - no std library or something
> - x64 only
> - no deep/full architecture optimization needed
> - no c++/templates etc.
>
> any ideas?
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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