[lldb-dev] lldb compiled from source 5X slower than homebrew or default lldb

[Adrian Prantl via lldb-dev]

Have you tried diff'ing your cmake invocation against the on used by homebrew?

-- adrian

> On Mar 9, 2018, at 12:59 AM, Timothee Cour via lldb-dev <lldb-dev at lists.llvm.org> wrote:
> 
> while testing out https://github.com/llvm-mirror/lldb/pull/3 I noticed
> that when I compiled lldb from source (even un-modified from git HEAD)
> it was 5X slower than homebrew lldb or default lldb:
> 
> I'm compiling lldb as follows:
> ```
> git clone https://github.com/llvm-mirror/llvm.git
> cd llvm/tools
> git clone https://github.com/llvm-mirror/lldb
> ## also, patch in https://github.com/llvm-mirror/lldb/pull/3
> git clone https://github.com/llvm-mirror/clang
> cd ..
> mkdir build
> cd build
> ccmake .. -G Ninja
> # here I set: CMAKE_BUILD_TYPE      Release
> ninja all
> ```
> 
> I also tried setting `LLVM_ENABLE_ASSERTIONS OFF` but no difference
> 
> 
> commands.txt
> ```
> b FOO
> r
> bt
> q
> ```
> 
> ./test is some program i have.
> 
> ```
> time lldb -s commands.txt -- ./test
> 8 seconds
> time ./build/bin/lldb -s commands.txt -- ./test
> 40 seconds
> ```
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