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-rw-r--r--lib/unistd.in.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/unistd.in.h b/lib/unistd.in.h
index 25e41d6c..c25ff8ef 100644
--- a/lib/unistd.in.h
+++ b/lib/unistd.in.h
@@ -1,5 +1,5 @@
/* Substitute for and wrapper around <unistd.h>.
- Copyright (C) 2003-2017 Free Software Foundation, Inc.
+ Copyright (C) 2003-2018 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or
modify it under the terms of either:
@@ -409,6 +409,13 @@ _GL_WARN_ON_USE (dup3, "dup3 is unportable - "
#if @GNULIB_ENVIRON@
+# if defined __CYGWIN__ && !defined __i386__
+/* The 'environ' variable is defined in a DLL. Therefore its declaration needs
+ the '__declspec(dllimport)' attribute, but the system's <unistd.h> lacks it.
+ This leads to a link error on 64-bit Cygwin when the option
+ -Wl,--disable-auto-import is in use. */
+_GL_EXTERN_C __declspec(dllimport) char **environ;
+# endif
# if !@HAVE_DECL_ENVIRON@
/* Set of environment variables and values. An array of strings of the form
"VARIABLE=VALUE", terminated with a NULL. */