nixpkgs-suyu/pkgs/development/libraries/boehm-gc/cygwin-pthread-dl.patch

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Don't pass "-lpthread -ldl" on Cygwin. See
http://thread.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/3219
for details.
--- gc-7.1/configure 2008-05-04 02:52:50.000000000 +0200
+++ gc-7.1/configure 2009-09-18 16:23:30.000000000 +0200
@@ -4859,7 +4859,7 @@
cat >>confdefs.h <<\_ACEOF
#define THREAD_LOCAL_ALLOC 1
_ACEOF
-
+ THREADDLLIBS=""
win32_threads=true
;;
*-*-darwin*)
@@ -5934,6 +5934,7 @@
# dyld calls anyway
case "$host" in
*-*-darwin*) ;;
+ *-*-cygwin*) ;;
*)
{ echo "$as_me:$LINENO: checking for dlopen in -ldl" >&5
echo $ECHO_N "checking for dlopen in -ldl... $ECHO_C" >&6; }