add doc on using faster link lld. it's not there yet.

* COMMENT -*- mode: org -*-

#+Date: 2018-05-04

Time-stamp: <2024-04-26>

Time-stamp: <2024-06-05>

#+STARTUP: content

* notes                                                               :entry:

** 2022-03-14 project dir structure

** 2018-05-06 optparse-applicative :: Stackage Server

https://www.stackage.org/lts-10.3/package/optparse-applicative-0.14.0.0

* later                                                               :entry:

** 2024-06-04 switch to a faster linker.

- switch to clang and lld failed.

- try gold

  gold works.

  file size is the same. check link speed.

  with ld

  tmake stack build

  5s

  with gold

  tmake stack build

  5s

  I see no difference.

  is gold being used at all?

- try add

  -pgml ld.gold

  ghc-options:

    - -optl-fuse-ld=gold

    - -pgml ld.gold

  ld-options:

    - -fuse-ld=gold

  now I see an error.

  #+begin_src sh

    [3 of 3] Linking .stack-work/dist/x86_64-linux/ghc-9.4.8/build/maybet/maybet [Flags changed]

    <no location info>: error:

	Warning: Couldn't figure out linker information!

		 Make sure you're using GNU ld, GNU gold or the built in OS X linker, etc.

    ld.gold: -Wl,--gc-sections: unknown option

    ld.gold: use the --help option for usage information

    ghc-9.4.8: `ld.gold' failed in phase `Linker'. (Exit code: 1)

  #+end_src

  search: ld.gold: -Wl,--gc-sections: unknown option

- haskell stack document has no doc on using clang or lld.

  maybe try build with cabal?

- lld support is not good yet. wait for some time for it to mature.

** 2022-03-12 drop redis-server as rd-api dependency.            :featurereq:

- use a built-in key-value db. such as Berkeley db, sqlite3, or leveldb.

  use a well known path for the db name.