Update Wiki URLs to point to GitLab

This moves all URL references to Trac Wiki to their corresponding
GitLab counterparts.

This substitution is classified as follows:

1. Automated substitution using sed with Ben's mapping rule [1]
    Old: ghc.haskell.org/trac/ghc/wiki/XxxYyy...
    New: gitlab.haskell.org/ghc/ghc/wikis/xxx-yyy...

2. Manual substitution for URLs containing `#` index
    Old: ghc.haskell.org/trac/ghc/wiki/XxxYyy...#Zzz
    New: gitlab.haskell.org/ghc/ghc/wikis/xxx-yyy...#zzz

3. Manual substitution for strings starting with `Commentary`
    Old: Commentary/XxxYyy...
    New: commentary/xxx-yyy...

See also !539

[1]: https://gitlab.haskell.org/bgamari/gitlab-migration/blob/master/wiki-mapping.json

4 files changed, 6 insertions, 6 deletions

diff --git a/compiler/main/DynFlags.hs b/compiler/main/DynFlags.hs
index fdc83fa94e..0783189aaf 100644
--- a/compiler/main/DynFlags.hs
+++ b/compiler/main/DynFlags.hs
@@ -322,7 +322,7 @@ import Foreign (Ptr) -- needed for 2nd stage
 --  * Adding the flag to the GHC Wiki
 --
 --    There is a change log tracking language extension additions and removals
---    on the GHC wiki:  https://ghc.haskell.org/trac/ghc/wiki/LanguagePragmaHistory
+--    on the GHC wiki:  https://gitlab.haskell.org/ghc/ghc/wikis/language-pragma-history
 --
 --  See #4437 and #8176.
 
@@ -5549,7 +5549,7 @@ picCCOpts dflags = pieOpts ++ picOpts
       -- otherwise things like stub.c files don't get compiled
       -- correctly.  They need to reference data in the Haskell
       -- objects, but can't without -fPIC.  See
-      -- http://ghc.haskell.org/trac/ghc/wiki/Commentary/PositionIndependentCode
+      -- https://gitlab.haskell.org/ghc/ghc/wikis/commentary/position-independent-code
        | gopt Opt_PIC dflags || WayDyn `elem` ways dflags ->
           ["-fPIC", "-U__PIC__", "-D__PIC__"]
       -- gcc may be configured to have PIC on by default, let's be
diff --git a/compiler/main/HscTypes.hs b/compiler/main/HscTypes.hs
index add0ee95d2..6772668420 100644
--- a/compiler/main/HscTypes.hs
+++ b/compiler/main/HscTypes.hs
@@ -2404,7 +2404,7 @@ noDependencies :: Dependencies
 noDependencies = Deps [] [] [] [] []
 
 -- | Records modules for which changes may force recompilation of this module
--- See wiki: http://ghc.haskell.org/trac/ghc/wiki/Commentary/Compiler/RecompilationAvoidance
+-- See wiki: https://gitlab.haskell.org/ghc/ghc/wikis/commentary/compiler/recompilation-avoidance
 --
 -- This differs from Dependencies.  A module X may be in the dep_mods of this
 -- module (via an import chain) but if we don't use anything from X it won't
diff --git a/compiler/main/Plugins.hs b/compiler/main/Plugins.hs
index 585eab1e45..93297522db 100644
--- a/compiler/main/Plugins.hs
+++ b/compiler/main/Plugins.hs
@@ -120,7 +120,7 @@ data Plugin = Plugin {
 -- is supported by most build environment.
 --
 -- For the full discussion, check the full proposal at:
--- https://ghc.haskell.org/trac/ghc/wiki/ExtendedPluginsProposal
+-- https://gitlab.haskell.org/ghc/ghc/wikis/extended-plugins-proposal
 
 data PluginWithArgs = PluginWithArgs
   { paPlugin :: Plugin
diff --git a/compiler/main/TidyPgm.hs b/compiler/main/TidyPgm.hs
index 6e84530193..ba9cd79e3d 100644
--- a/compiler/main/TidyPgm.hs
+++ b/compiler/main/TidyPgm.hs
@@ -234,8 +234,8 @@ Plan B: include pragmas, make interfaces
 Note [Choosing external Ids]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 See also the section "Interface stability" in the
-RecompilationAvoidance commentary:
-  http://ghc.haskell.org/trac/ghc/wiki/Commentary/Compiler/RecompilationAvoidance
+recompilation-avoidance commentary:
+  https://gitlab.haskell.org/ghc/ghc/wikis/commentary/compiler/recompilation-avoidance
 
 First we figure out which Ids are "external" Ids.  An
 "external" Id is one that is visible from outside the compilation