在小牛队中没有llvm opt命令

Question

I installed Xcode 5.0.1 on Macosx 10.9 Mavericks and the command line tools (I can use gcc/clang on the command line for instance) but the command opt seems to have disappeared. Was it replaced by something else ?

Answer 1

Apple never shipped 'base' LLVM tools with its within XCode command line tools, only clang. You need to compile the desired revision / release of LLVM by yourself. You can download the pre-built binaries at http://llvm.org/releases/download.html as well.

Answer 2

My strategy (on Mavericks) was to do brew install llvm then symlink:

sudo ln -s /usr/local/Cellar/llvm/3.4/bin/opt /usr/bin/opt
sudo ln -s /usr/local/Cellar/llvm/3.4/bin/llc /usr/bin/llc

Answer 3

I got this to work on High Sierra by installing it via Homebrew.

brew install llvm

Once you're done with that, Homebrew will tell you something like this:

To use the bundled libc++ please add the following LDFLAGS:
  LDFLAGS="-L/usr/local/opt/llvm/lib -Wl,-rpath,/usr/local/opt/llvm/lib"

This formula is keg-only, which means it was not symlinked into /usr/local,
because macOS already provides this software and installing another version in
parallel can cause all kinds of trouble.

If you need to have this software first in your PATH run:
  echo 'export PATH="/usr/local/opt/llvm/bin:$PATH"' >> ~/.bash_profile

For compilers to find this software you may need to set:
    LDFLAGS:  -L/usr/local/opt/llvm/lib
    CPPFLAGS: -I/usr/local/opt/llvm/include


If you need Python to find bindings for this keg-only formula, run:
  echo /usr/local/opt/llvm/lib/python2.7/site-packages >> /usr/local/lib/python2.7/site-packages/llvm.pth

Go ahead and run:

echo 'export PATH="/usr/local/opt/llvm/bin:$PATH"' >> ~/.bash_profile

to stick that into your .bashrc / .bash_profile .

Answer 4

I'll add a solution for El Capitan and Sierra since now it shows the error

ln: /usr/bin/opt: Operation not permitted

It's really simple, just go to ~/.bash_source (or the rc file of whatever shell you have) and write alias opt='/usr/local/Cellar/llvm/<llvm_version>/bin/opt'