How do I determine my GHC version?

Question

This is probably a very dumb question, but I can't seem to find the answer...

You might have multiple! A hacky but very easy way to check which ones is to type `ghc-` into your terminal, then hit tab to ask your shell for completions. — Daniel Wagner, Jun 02 '21 at 07:07

score 45 · Answer 1 · answered Aug 23 '17 at 22:39

45

To find which version my stack is using, I ran

$ stack ghc -- --version

and got

$ stack ghc -- --version
The Glorious Glasgow Haskell Compilation System, version 8.0.2

answered Aug 23 '17 at 22:39

mherzl

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Nice use of the double hyphen! Can be used with the sandboxed version of ghc as well! – bergercookie Aug 29 '17 at 10:45
5

Warning: if you do not have `ghc` installed, this command will download almost 200MB and install `ghc` in your system. – evaristegd Jul 26 '20 at 19:46
@evaristegd Just happened to me: `Preparing to install GHC to an isolated location.` – Daniel Nov 18 '21 at 16:35

score 32 · Accepted Answer · edited Aug 18 '17 at 08:51

32

ghc --version did the trick on Ubuntu, thanks Karolis!

Edit: works on mac too (macOS Sierra 10.12.6)

edited Aug 18 '17 at 08:51

Nick Brady

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answered Oct 25 '12 at 17:19

Diego Saa

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score 6 · Answer 3 · answered Dec 31 '19 at 00:59

Depending on your install method and architecture, some commands may differ. Some people may have several versions installed. Here is a selection of information that may be useful:

stack version

❯ stack --version
Version 2.1.3, Git revision 0fa51b9925decd937e4a993ad90cb686f88fa282 (7739 commits) x86_64 hpack-0.31.2

ghc version (as noted by @mherzl)

❯ stack ghc -- --version
The Glorious Glasgow Haskell Compilation System, version 8.6.5

standard ghc version command

❯ ghc --version
The Glorious Glasgow Haskell Compilation System, version 8.8.1

cabal version

❯ cabal --version
cabal-install version 3.0.0.0
compiled using version 3.0.0.0 of the Cabal library

GHC's repl

❯ ghci --version
The Glorious Glasgow Haskell Compilation System, version 8.8.1

If using llvm with -fllvm flag

❯ llvm-gcc -v
Apple clang version 11.0.0 (clang-1100.0.33.16)
Target: x86_64-apple-darwin19.2.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

How do I determine my GHC version?

3 Answers3

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