[commit: packages/unix] master, safefixes710again: Do not blindly add libdl to extra libraries (123fcba)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/unix

On branches: master,safefixes710again
Link       : http://ghc.haskell.org/trac/ghc/changeset/123fcba7125c3b94ad35c3d7dfe31c715a79a470/unix

>---------------------------------------------------------------

commit 123fcba7125c3b94ad35c3d7dfe31c715a79a470
Author: Igor Pashev <pashev.igor at gmail.com>
Date:   Tue Aug 19 16:23:35 2014 +0400

    Do not blindly add libdl to extra libraries
    
    On some systems dlopen() is available without libdl (illumos, solaris).
    Sometimes libdl.so cannot be loaded by runtime linker, see
    https://ghc.haskell.org/trac/ghc/ticket/8713
    
    Closes #8


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123fcba7125c3b94ad35c3d7dfe31c715a79a470
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index c10bf89..f519d19 100644
--- a/configure.ac
+++ b/configure.ac
@@ -186,7 +186,7 @@ else
 fi
 
 # Avoid adding dl if absent or unneeded
-AC_CHECK_LIB(dl, dlopen, [EXTRA_LIBS="$EXTRA_LIBS dl"])
+AC_SEARCH_LIBS([dlopen], [dl], [EXTRA_LIBS="$EXTRA_LIBS $ac_lib"])
 
 # -{l,}pthread goo
 AC_CANONICAL_TARGET