patch 7.4.2080

Problem:    When using PERROR() on some systems assert_fails() does not see
            the error.
Solution:   Make PERROR() always report the error.

src/message.c

@@ -521,6 +521,21 @@ emsg_not_now(void)
     return FALSE;
 }
 
+#if !defined(HAVE_STRERROR) || defined(PROTO)
+/*
+ * Replacement for perror() that behaves more or less like emsg() was called.
+ * v:errmsg will be set and called_emsg will be set.
+ */
+    void
+do_perror(char *msg)
+{
+    perror(msg);
+    ++emsg_silent;
+    emsg((char_u *)msg);
+    --emsg_silent;
+}
+#endif
+
 /*
  * emsg() - display an error message
  *

src/proto/message.pro

@@ -8,6 +8,7 @@ void trunc_string(char_u *s, char_u *buf, int room, int buflen);
 void reset_last_sourcing(void);
 void msg_source(int attr);
 int emsg_not_now(void);
+void do_perror(char *msg);
 int emsg(char_u *s);
 int emsg2(char_u *s, char_u *a1);
 void emsg_invreg(int name);

src/version.c

@@ -758,6 +758,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2080,
 /**/
     2079,
 /**/

src/vim.h

@@ -1652,7 +1652,7 @@ typedef UINT32_TYPEDEF UINT32_T;
 #ifdef HAVE_STRERROR
 # define PERROR(msg)		    (void)emsg3((char_u *)"%s: %s", (char_u *)msg, (char_u *)strerror(errno))
 #else
-# define PERROR(msg)		    perror(msg)
+# define PERROR(msg)		    do_perror(msg)
 #endif
 
 typedef long	linenr_T;		/* line number type */