Mostly cosmetic changes

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5344 42af7a65-404d-4744-a932-0658087f49c3

nuttx/tools/README.txt

@@ -290,11 +290,17 @@ mknulldeps.sh
 
   The mknulldeps.sh is a stub script that does essentially nothing.
 
-  NOTE:  The mkdep.* files are undergoing change.  mkdeps.sh is a bash
+  NOTE:  The mk*deps.* files are undergoing change.  mkdeps.sh is a bash
   script that produces dependencies well for POSIX style hosts (e..g.,
   Linux and Cygwin).  It does not work well for mixed environments with
   a Windows toolchain running in a POSIX style environemnt (hence, the
-  mknulldeps.sh script).
+  mknulldeps.sh script).  And, of course, cannot be used in a Windows
+  nativ environment.
+
+  [mkdeps.sh does have an option, --winpath, that purports to convert
+  the dependencies generated by a Windows toolchain to POSIX format.
+  However, that is not being used and mostly likely does not cover
+  all of the conversion cases.]
 
   mkdeps.bat is a simple port of the bash script to run in a Windows
   command shell.  However, it does not work well either because some
@@ -302,8 +308,13 @@ mknulldeps.sh
   by the CMD.exe shell.
 
   mkdeps.c generates mkdeps (on Linux) or mkdeps.exe (on Windows).
-  This C version should solve all of the issues.  However, this verison
-  is still under-development.
+  However, this verison is still under-development.  It works well in
+  the all POSIX environment or in the all Windows environment but also
+  does not work well in mixed POSIX environment with a Windows toolchain.
+  In that case, there are still issues with the conversion of things like
+  'c:\Program Files' to 'c:program files' by bash.  Those issues may,
+  eventually be solvable but for now continue to use mknulldeps.sh in
+  that mixed environment.
 
 define.sh
 

nuttx/tools/mkdeps.c

@@ -396,7 +396,8 @@ static void do_dependency(const char *file, char separator)
       ret = system(command);
       if (ret != 0)
         {
-          fprintf(stderr, "ERROR: ssystem(%s) failed\n", command);
+          fprintf(stderr, "ERROR: system failed: %s\n", strerror(errno));
+          fprintf(stderr, "       command: %s\n", command);
           exit(EXIT_FAILURE);
         }