Avoid libraries if unneeded (librt, libdl, libpthread)
I have GHC on an unusual system [1]
libdl.so.1, librt.so.1 and some others are "filter libraries": they do not provide real functions (almost all is in libc.so.1), but to make thing work libFOO.so are GNU ld linker scripts: thus linking is successful, libFOO.so.1 is not linked in :-)
Unfortunately, runtime linker (ld.so.1) does not understand GNU ld linker scripts. And I get errors like this:
# ghci -package unix
GHCi, version 7.6.3: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package array-0.4.0.1 ... linking ... done.
Loading package deepseq-1.3.0.1 ... linking ... done.
Loading package bytestring-0.10.0.2 ... linking ... done.
Loading package old-locale-1.0.0.5 ... linking ... done.
Loading package time-1.4.0.1 ... linking ... done.
Loading package unix-2.7.0.0 ... <command line>: can't load .so/.DLL for: /usr/lib/gcc/x86_64-pc-solaris2.11/4.7/../../../x86_64-illumos/libdl.so (ld.so.1: ghc: fatal: /usr/lib/gcc/x86_64-pc-solaris2.11/4.7/../../../x86_64-illumos/libdl.so: unknown file type)
The unix package v2.6 had the same issue with librt.so too, in version 2.7 libdl.so remains.
I use the attached patch for GHC 7.6.3 to fix this issue.
In general I suggest to use AC_SEARCH_LIBS instead of AC_CHECK_LIB
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.6.3 |
| Type | Bug |
| TypeOfFailure | GhcDoesn'tWork |
| Priority | normal |
| Resolution | Unresolved |
| Component | libraries/unix |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |
Edited by ip1981