#3242: GHCi linker does not correctly locate static libraries under Windows
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Reporter: jeffz1 | Owner: Phyx-
Type: bug | Status: patch
Priority: high | Milestone: 7.10.3
Component: GHCi | Version: 7.4.1
Resolution: | Keywords:
Operating System: Windows | Architecture: Unknown/Multiple
Type of failure: None/Unknown | Test Case: T3242
Blocked By: 3658 | Blocking:
Related Tickets: #7097 | Differential Rev(s): Phab:D1455
Wiki Page: |
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Comment (by Ben Gamari ):
In [changeset:"acce37f38bc3867f86cf717694915746bb2f278e/ghc" acce37f/ghc]:
{{{
#!CommitTicketReference repository="ghc"
revision="acce37f38bc3867f86cf717694915746bb2f278e"
Fix archive loading on Windows by the runtime loader
The runtime loader is unable to find archive files `.a` shipping
with the inplace `GCC`.
It seems the issue is caused by `findArchive` being unable to
find any archives that are shipped using the in-place `GCC`.
- It works on Linux because `findArchive` would search
the standard Linux include path.
- It works during compilation because `GCC` can find it's own libraries
(we explicitly tell it where to look for libraries using the `gcc`
wrapper around `realgcc`)
So fixing the issue means using `searchForLibUsingGcc` in `findArchive`
as well, which will then find the correct file.
The reason for the error as it is, is because if we can't locate the
library using any of the methods we have, we assume it is a system dll,
or something on the system search path. e.g. if trying to load
`kernel32.dll`.
There is a slight issue in that the `GHCi` code (incorrectly) favors
`static archives` over `dynamic` ones
```
findDll `orElse`
findArchive `orElse`
tryGcc `orElse`
tryGccPrefixed `orElse`
assumeDll
```
This has the unwanted effect of when `kernel32` is specified as a lib,
it will try to load `kernel32.a` instead of `kernel32.dll`.
To solve this I have added another search function that is able to
search the Windows search paths using `SearchPath` in order to find if
it is a dll on the system search path.
The new search order is:
```
findDll `orElse`
findSysDll `orElse`
tryGcc `orElse`
findArchive `orElse`
assumeDll
```
(`tryGccPrefixed` was rolled into `tryGcc` so it is no longer needed at
top level)
Test Plan: ./validate added new windows tests T3242
Reviewers: thomie, erikd, hvr, austin, bgamari
Reviewed By: thomie, erikd, bgamari
Differential Revision: https://phabricator.haskell.org/D1455
GHC Trac Issues: #3242
}}}
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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/3242#comment:46
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