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| author | Sylvain Henry <sylvain@haskus.fr> | 2021-04-06 13:56:53 +0200 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2021-04-07 12:39:00 -0400 |
| commit | d014ab0db0c167ab5a0f9cb15280aee6fd8f3621 (patch) | |
| tree | 9c60484f66b951774db80f2de2e98e978087467a /mk/config.mk.in | |
| parent | 546f8b1478e43f18b25236a20c6c30fa986a046a (diff) | |
| download | haskell-d014ab0db0c167ab5a0f9cb15280aee6fd8f3621.tar.gz | |
Remove dynamic-by-default (#16782)
Dynamic-by-default was a mechanism to automatically select the -dynamic
way for some targets.
It was implemented in a convoluted way: it was defined as a flavour
option, hence it couldn't be passed as a global settings (which are
produced by `configure` before considering flavours), so a build system
rule was used to pass -DDYNAMIC_BY_DEFAULT to the C compiler so that
deriveConstants could infer it.
* Make build system has it disabled for 8 years (951e28c0625ece7e0db6ac9d4a1e61e2737b10de)
* It has never been implemented in Hadrian
* Last time someone tried to enable it 1 year ago it didn't work (!2436)
* Having this as a global constant impedes making GHC multi-target (see !5427)
This commit fully removes support for dynamic-by-default. If someone
wants to reimplement something like this, it would probably need to move
the logic in the compiler.
(Doing this would probably need some refactoring of the way the compiler
handles DynFlags: DynFlags are used to store and to pass enabled ways to
many parts of the compiler. It can be set by command-line flags, GHC
API, global settings. In multi-target GHC, we will use DynFlags to load
the target platform and its constants: but at this point with the
current DynFlags implementation we can't easily update the existing
DynFlags with target-specific options such as dynamic-by-default without
overriding ways previously set by the user.)
Diffstat (limited to 'mk/config.mk.in')
| -rw-r--r-- | mk/config.mk.in | 20 |
1 files changed, 0 insertions, 20 deletions
diff --git a/mk/config.mk.in b/mk/config.mk.in index 9e6c3d8c40..086a9147f2 100644 --- a/mk/config.mk.in +++ b/mk/config.mk.in @@ -124,26 +124,6 @@ endif PlatformSupportsSharedLibs = $(if $(filter $(TARGETPLATFORM),\ $(NoSharedLibsPlatformList)),NO,YES) -# DYNAMIC_BY_DEFAULT says whether this compiler will default to -# building dynamic executables, i.e. -dynamic is on. We do this for -# most platforms because it lets us use the system dynamic linker -# instead of our own linker for GHCi. -# -# Currently this isn't possible on Windows, and we have not yet enabled -# it on i386 while we consider the performance implications. -# -ifeq "$(TargetOS_CPP)" "mingw32" -DYNAMIC_BY_DEFAULT = NO -else ifeq "$(TargetArch_CPP)" "i386" -DYNAMIC_BY_DEFAULT = NO -else -DYNAMIC_BY_DEFAULT = YES -endif - -# For now, we unconditionally disable dynamic-by-default, as the -# cabal-install's that are in the wild don't handle it properly. -DYNAMIC_BY_DEFAULT = NO - # If building both v and dyn ways, then use -dynamic-too to build them. # This makes the build faster. DYNAMIC_TOO = YES |