[llvm-dev] Unusual file size for libs

[Joerg Sonnenberger via llvm-dev]

On Thu, Dec 31, 2015 at 09:53:27AM +0530, vivek pandya via llvm-dev wrote:
> > > Hello,
> > >
> > > I am building llvm and clang with following options
> > -*DLIBCLANG_BUILD_STATIC=ON
> > > -DCMAKE_OSX_DEPLOYMENT_TARGET=10.10 -DCMAKE_OSX_SYSROOT=`xcrun
> > > --show-sdk-path` *
> > > Here I want to use libclang with OS X application and minimum deployment
> > > target for my app is 10.10 . But this build command generates around 7 GB
> > > of libs. This is unusual. For example normal build will generate
> > > libLLVMCodeGen.a of size 4 MB but with above mentioned Cmake option it
> > > generates 25 MB . Is it due to I am building on 10.11 OS X and minimum
> > > required target is set to 10.10 ?
> > > Please explain .
> >
> > Have you disabled debugging?
> >
> 
> No build type is debug but previously when I didn't pass
>  -DCMAKE_OSX_DEPLOYMENT_TARGET=10.10 -DCMAKE_OSX_SYSROOT=`xcrun options ,
> with Debug build type size is very less. 7 GB is very unusual.
> http://llvm.org/docs/GettingStarted.html according to this guide even with
> Debug build type total size could go about 3 GB .

Well, for the build on Linux I certainly see 7GB w/ and 1GB w/o debug
symbols for the whole build directory -- that's with shared library.
For libLLVMCodeGen.so, it is 4MB vs 85MB. Compressed debug information
or differences in the unification can make some difference, but I am not
surprised by 25MB at all.

Joerg