[Mesa-dev] [PATCH] targets/opencl: Fix (static) linking with LLVM

[Kertesz Laszlo]

>> Hi,
>> i too hit the X crashing issue. But i am unable to compile the latest
>> git (10.2-branchpoint-318-g4c7bf8a according to 'git describe')
>> Here is the errors i get:
>>
>>
>> make[3]: Entering directory '/compile/mesa/src/gallium/targets/gbm'
>>   CC       gbm.lo
>>   CXXLD    gbm_gallium_drm.la
>> /usr/local/lib/llvm32/lib/libLLVMSupport.a(Process.o): In function
> Hmm that file is not provide by us, so I'm afraid I cannot help you here.
> Perhaps the LLVM folks will have a better idea.
>

Solved.

I added LDFLAGS="-ltinfo -lpthread" to the configure options and
recompiled llvm with the additional "--disable-terminfo --disable-zlib"
options.

Seems there were 2 issues, both somewhat trivial:

>> `llvm::sys::Process::FileDescriptorHasColors(int)':
>> Process.cpp:(.text._ZN4llvm3sys7Process23FileDescriptorHasColorsEi+0x67): undefined
>> reference to `setupterm'
>> Process.cpp:(.text._ZN4llvm3sys7Process23FileDescriptorHasColorsEi+0x92): undefined
>> reference to `tigetnum'
>> Process.cpp:(.text._ZN4llvm3sys7Process23FileDescriptorHasColorsEi+0xa0): undefined
>> reference to `set_curterm'
>> Process.cpp:(.text._ZN4llvm3sys7Process23FileDescriptorHasColorsEi+0xa8): undefined
>> reference to `del_curterm'

The above have to do with some terminal output options (i saw some chat
about removing it by default but it isnt the case). Solution is to add
LDFLAGS="-ltinfo" or recompile llvm with "--disable-terminfo" option.

>> /usr/local/lib/llvm32/lib/libLLVMSupport.a(Compression.o): In function
>> `llvm::zlib::compress(llvm::StringRef, llvm::SmallVectorImpl<char>&,
>> llvm::zlib::CompressionLevel)':
>> Compression.cpp:(.text._ZN4llvm4zlib8compressENS_9StringRefERNS_15SmallVectorImplIcEENS0_16CompressionLevelE+0x26):
>> undefined reference to `compressBound'
>> Compression.cpp:(.text._ZN4llvm4zlib8compressENS_9StringRefERNS_15SmallVectorImplIcEENS0_16CompressionLevelE+0xa7):
>> undefined reference to `compress2'

These above are related to zlib. I have zlib headers installed and by
default llvm will use them, but at least on my system (both my actual
desktop and my 32 bit chroot) it messes up static linking in mesa. The
only solution i found was to disable zlib when building llvm, by adding
"--disable-zlib" to its configure script.

> Explicitly setting LDFLAGS is a recipe for disaster. Try to avoid that at all
> cost.
> 
> Cheers
> Emil

Now i have those specified since i was building mesa with shared libs on
a 64 bit system so i had to install it in another prefix, different from
that of the 64 bit build.
But now static linking works and i dont need it anyway on the 64 bit
machine.

>>>
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>>
> 

-- 
O zi buna,

Kertesz Laszlo