#3637: ./configure doesn't understand Gentoo's build/host/target
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Reporter: kolmodin | Owner:
Type: bug | Status: new
Priority: high | Milestone: 6.12.1
Component: Build System | Version: 6.12.1 RC1
Resolution: | Keywords: regression
Difficulty: Unknown | Os: Unknown/Multiple
Testcase: | Architecture: Unknown/Multiple
Failure: Building GHC failed |
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Changes (by asuffield):
* cc: [email protected] (added)
* failure: => Building GHC failed
Comment:
It's not clear what configure is trying to do with the
--{host,build,target} arguments here. GNU-style configure scripts are
supposed to accept GNU-format configuration triples (as used by
config.{sub,guess}) and direct the configure script to set up for a
particular mode of cross-compilation. The vendor build scripts pass these
arguments because their own "cross compile the distribution" automation
knows more about what's going on. There is a cluster of bugs in
configure.ac that get this all wrong.
Option 1 is "reimplement config.sub", which is wrong unless you're trying
to reinvent autoconf. Options 2 and 3 are essentially the same here, both
being "we shall not support GNU-style cross compiling", which is probably
also wrong.
The cross-compile setup code in configure is currently a mess; the
autodetection is broken. From eyeballing it, I doubt it works at all. To
move forward:
* Are there non-obsolete reasons why configure is this way?
* Is ghc somehow different from other compilers with regard to cross-
compilation?
* Was the 6.10 configure logic anything more than legacy gunk to work
around bugs in autoconf versions from 10 years ago, which are no longer
relevant?
* Is there any reason why the whole lot shouldn't be thrown out in favour
of the normal autoconf handling?
If the answer to all of those is 'no', the solution is trivial. Otherwise,
the answers should prove illuminating in how to proceed.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3637#comment:4>
GHC <http://www.haskell.org/ghc/>
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