Declare globals as extern in headers, and define in source file

Otherwise, each source file that includes the header gets its own
definition, and according to the C standard (C99 6.9p5):

> If an identifier declared with external linkage is used in an
> expression (other than as part of the operand of a sizeof operator
> whose result is an integer constant), somewhere in the entire
> program there shall be exactly one external definition for the
> identifier

Most compilers use the .bss section for zero data, but if it uses
.data instead, or if -Wl,--warn-common is used, this will cause a
linking error.

1 files changed, 3 insertions, 0 deletions

diff --git a/client.c b/client.c
index d6b7b16..9ff192e 100644
--- a/client.c
+++ b/client.c
@@ -30,6 +30,9 @@
 
 #include "bounce.h"
 
+char *clientPass;
+char *clientAway;
+
 static size_t active;
 
 enum Need {