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Basically, the problem is because I use Go binding of LLVM, then it hard to use preinstalled LLVM.
This article is about how I solve the problem step by step.
First we need to install dependencies by apt-get(travis use ubuntu 14.04 if you do not spec anything)
Now we get LLVM 8 on Travis.
Then we need to setup environment variables:
llvm-config
is a helper tool of LLVM that would generate the meta data for your program, e.g. llvm-config --cppflags
contains include path to installed headers path of LLVM.
At here the suffix -8
is because it installed like that.
But if we dig into build flow, we will find llvm.org/llvm/tools/llvm-go/llvm-go.go
generated the thing! It works like:
Now we can work with latest version of LLVM basically, but if you install some older LLVM in your machine, it won’t compile!
Because Go binding would expect some variable, but C didn’t have one(old version).
Use LLVM 6.0 to be example:
Now, you can test your code by preinstalled LLVM!
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