Fix WEXITSTATUS compile error on openbsd (and ubuntu)

I noticed that WEXITSTATUS was failing when compiling
sibs on ubuntu.
WEXITSTATUS uses address of input which fails if the input
is directly passed by return of a function call.

Also added error checking if the process was stopped/killed
by receiving a signal or if it failed in any other way.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 151e5a5..b1982bd 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -9,6 +9,11 @@
 using namespace std;
 using namespace sibs;
 
+// TODO: Fail if multiple versions of the same dependency is used
+// as linking will fail because of multiple definitions of the same thing
+
+// TODO: Detect recursive dependencies and give error.
+
 void usage()
 {
     printf("usage: sibs COMMAND\n\n");