llvm: update to llvm-9.0.0 / updated PKG_URL

[5schatten]

https://releases.llvm.org/9.0.0/docs/ReleaseNotes.html

[MilhouseVH]

MISSING        Delta: -26,695,088  #0922: n/a           #0921b: 26,695,088   /usr/lib/libLLVM-8.so
NEW FILE       Delta: 31,495,632   #0922: 31,495,632    #0921b: n/a          /usr/lib/libLLVM-9.so

5MB increase... :(

[lrusak]

I’d check the cmake build options for new or changed options as that change size seems way too big

[MilhouseVH]

image comparison: http://ix.io/1WvD

#0922: last night's test build (llvm-8.0.1, pulseaudio-12.2)
#0923b: new test build (llvm-9.0, pulseaudio-13.0)

[5schatten]

I compared both CMakeLists for 9.0 & 8.0 and found this option LLVM_ENABLE_UNWIND_TABLES which is new. https://llvm.org/docs/CMake.html#llvm-specific-variables

LLVM_ENABLE_UNWIND_TABLES:BOOL
Enable unwind tables in the binary. Disabling unwind tables can reduce the size of the libraries. Defaults to ON.

Also there is a new RISChttps://raw.githubusercontent.com/llvm/llvm-project/release/8.x/llvm/CMakeLists.txtV target but we only build AMDGPU so this should not matter.

https://raw.githubusercontent.com/llvm/llvm-project/release/9.x/llvm/CMakeLists.txt
https://raw.githubusercontent.com/llvm/llvm-project/release/8.x/llvm/CMakeLists.txt

[MilhouseVH]

Adding -DLLVM_ENABLE_UNWIND_TABLES=OFF (http://ix.io/1Xbx) seems to get us more-or-less back to where we were with llvm-8.x.

With default LLVM_ENABLE_UNWIND_TABLES (ie. ON):

MISSING        Delta: -26,695,088  #0922: n/a           #0921b: 26,695,088   /usr/lib/libLLVM-8.so
NEW FILE       Delta: 31,495,632   #0922: 31,495,632    #0921b: n/a          /usr/lib/libLLVM-9.so

With -DLLVM_ENABLE_UNWIND_TABLES=OFF:

MISSING        Delta: -26,695,088  #0927: n/a           #0921b: 26,695,088   /usr/lib/libLLVM-8.so
NEW FILE       Delta: 28,091,856   #0927: 28,091,856    #0921b: n/a          /usr/lib/libLLVM-9.so

So a 1.3MB increase with llvm-9.0, which seems more reasonable.