diff options
| author | Douglas Wilson <douglas.wilson@gmail.com> | 2022-07-27 16:55:57 +0100 |
|---|---|---|
| committer | Douglas Wilson <douglas.wilson@gmail.com> | 2022-08-03 11:51:07 +0100 |
| commit | e5365b95e40d06b95dc1f6a682996bf6cf8e8b52 (patch) | |
| tree | 76f433fa4a7c281afe6cf997473452e7c96d9f32 | |
| parent | 55f8541f6d5cc666d97e02cefacaf6eb4afe7e0d (diff) | |
| download | haskell-wip/dougwilson/9.4-custom-makefile-changes.tar.gz | |
ghc-9.4: make build system: Detect too-new boot compiler and docswip/dougwilson/9.4-custom-makefile-changes
| -rw-r--r-- | configure.ac | 4 | ||||
| -rw-r--r-- | ghc.mk | 21 |
2 files changed, 25 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 3d3b53b2a3..fa0cc77351 100644 --- a/configure.ac +++ b/configure.ac @@ -230,6 +230,10 @@ MinBootGhcVersion="9.0" FP_COMPARE_VERSIONS([$GhcVersion],[-lt],[$MinBootGhcVersion], [AC_MSG_ERROR([GHC version $MinBootGhcVersion or later is required to compile GHC.])]) +# See Note [Support for building ghc 9.4 with the make build system] +FP_COMPARE_VERSIONS([$GhcVersion],[-lt],[9.1], + [AC_SUBST([CanBootWithMake],"YES")]) + if test `expr $GhcMinVersion % 2` = "1" then if test "$EnableBootstrapWithDevelSnaphost" = "NO" @@ -100,6 +100,24 @@ else $(error Make has restarted itself $(MAKE_RESTARTS) times; is there a makefile bug? See https://gitlab.haskell.org/ghc/ghc/wikis/building/troubleshooting#make-has-restarted-itself-3-times-is-there-a-makefile-bug for details) endif +################################################## +# {- Note [Support for building ghc 9.4 with the make build system] -} +# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +# For ghc-9.6 and forward we will be removing the make build system in favour of +# the in-tree hadrian build system. However for ghc-9.4 we do still support +# make. This support is fragile, and we do recommend that you build with +# hadrian if you are able to do so. The blog post +# https://www.haskell.org/ghc/blog/20220805-make-to-hadrian.html gives advice to +# packagers adapting to hadrian. +# +# There are several hacks in place to allow ghc-9.4 to build with make: +# * We require a boot compiler < ghc-9.2. See issue #21914 +# * We carefully build stage0 Cabal with the boot compiler's process library, +# which does not satisfy Cabal's bounds. See issue #21953 +ifneq "$(CanBootWithMake)" "YES" +$(error The make build system requires a boot compiler older than ghc-9.2. Your boot compiler is too new and cannot be used to build ghc-9.4 with make. Either boot with ghc 9.0.2 or build with hadrian. See https://www.haskell.org/ghc/blog/20220805-make-to-hadrian.html for advice on transitioning to hadrian.) +endif + # ----------------------------------------------------------------------------- # Misc GNU make utils @@ -484,6 +502,9 @@ libraries/template-haskell_CONFIGURE_OPTS += --flags=+vendor-filepath libraries/ghc-bignum_CONFIGURE_OPTS += -f $(BIGNUM_BACKEND) +# See Note [Support for building ghc 9.4 with the make build system] +# Here we carefully configure stage0 Cabal to build with the boot compiler's +# process, which does not satisfy Cabal's bounds. CABAL_DEPS = text transformers mtl parsec Cabal/Cabal-syntax CABAL_BOOT_DEPS = process array filepath base bytestring containers deepseq time unix pretty directory |