#13491: UNIQUE_BITS is not crosscompiler-friendly
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Reporter: slyfox | Owner: (none)
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 8.0.1
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s): Phab:D3397
Wiki Page: |
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Comment (by Ben Gamari ):
In [changeset:"01b062ec3fa138b92124ce7ca4deca0ddcb474ea/ghc"
01b062ec/ghc]:
{{{
#!CommitTicketReference repository="ghc"
revision="01b062ec3fa138b92124ce7ca4deca0ddcb474ea"
unique: fix UNIQUE_BITS crosscompilation (Trac #13491)
The #13491 manifests best when we try to crosscompile
from 32-bit (i386-linux) to 64-bit (powerpc64-linux)
system:
./configure --target=powerpc64-unknown-linux-gnu
The build fails at assembly time:
"inplace/bin/ghc-stage1" ... -c rts/StgStartup.cmm
/tmp/ghc19687_0/ghc_4.s: Assembler messages:
/tmp/ghc19687_0/ghc_4.s:11:0: error:
Error: unknown pseudo-op: `.l'
|
11 | .L<\x00>4:
| ^
That happens because UNIQUE_BITS is defined in terms
of WORD_SIZE_IN_BITS macro:
#define UNIQUE_BITS (WORD_SIZE_IN_BITS - 8)
WORD_SIZE_IN_BITS is 64 bits (equals to target value)
while ghc-stage1 is still running on i386-linux
The fix is to stop relying on target macros and use
host's 'sizeof (HsInt)' and 'finiteBitSize' way to
determine unique layout.
Signed-off-by: Sergei Trofimovich
Test Plan: build i386-to-powerpc64 crosscompiler
Reviewers: rwbarton, austin, bgamari
Reviewed By: bgamari
Subscribers: RyanGlScott, thomie
Differential Revision: https://phabricator.haskell.org/D3397
}}}
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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13491#comment:2
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