#1883: GHC can't find library using "short" name
----------------------+-----------------------------------------------------
Reporter: m4dc4p | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.6.1
Severity: normal | Keywords: link library windows
Testcase: | Architecture: x86
Os: Windows |
----------------------+-----------------------------------------------------
I wanted to build HDBC-postgresql 1.0.1[1] today, and ran into a problem
where my test program would not load and instead gave this error:
{{{
can't load .so/.DLL for: pq (addDLL: unknown error)
}}}
I traced this to the 'extra-libraries' directive in the .cabal file. It
read
{{{
Extra-Libraries: pq
}}}
When I changed it to
{{{
Extra-Libraries: libpq
}}}
The error went away. Somehow "pq" is not enough to get "libpq.dll" loaded.
Note that building on Windows required some other changes.[2]
This was using Cabal 1.1
[1] http://hackage.haskell.org/cgi-bin/hackage-scripts/package/HDBC-
postgresql-1.0.1.0
[2] From http://software.complete.org/hdbc/wiki/FrequentlyAskedQuestions
To build on Windows, you must specify where the postgresql include and
library files are. Follow these two steps:
1. Ensure the files are NOT installed in a directory with spaces in the
name (e.g. "C:\Program Files"). For example, install them in c:\pgsql.
2. Assuming postgresql is installed in C:\pgsql, add the following
information to the .cabal file:
{{{
include-dirs: C:\pgsql\include, C:\pgsql\include\server, .
extra-lib-dirs: C:\pgsql\bin
}}}
Notice the "." at the end of include-dirs to ensure the current
directory is also searched. Also notice "bin" directory is specified in
"extra-lib-dirs." This is important in the next step.
3. HDBC-postgresl depends on "libpa.dll" in the bin directory above.
The .cabal file refers to the "pq", but that doesn't work on Windows.
Change it to libpq like so:
Extra-Libraries: libpq
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1883>
GHC <http://www.haskell.org/ghc/>
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