[PATCH] Implement --strict-mode

[Richard Weinberger]

Using this flag make treats warnings as errors and stops if it encounters one.
It is most useful in combination with --warn-undefined-variables
to detect undefined variables and avoid unconditional execution of partial
commands.

Signed-off-by: Richard Weinberger <address@hidden>
---
 main.c    | 9 +++++++++
 makeint.h | 2 +-
 misc.c    | 6 ++++++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/main.c b/main.c
index 0a2774c..57575d0 100644
--- a/main.c
+++ b/main.c
@@ -370,6 +370,8 @@ static const char *const usage[] =
                               Consider FILE to be infinitely new.\n"),
     N_("\
   --warn-undefined-variables  Warn when an undefined variable is 
referenced.\n"),
+    N_("\
+  --strict-mode               Treat warnings as error.\n"),
     NULL
   };
 
@@ -425,6 +427,8 @@ static const struct command_switch switches[] =
     { CHAR_MAX+5, flag, &warn_undefined_variables_flag, 1, 1, 0, 0, 0,
       "warn-undefined-variables" },
     { CHAR_MAX+6, string, &eval_strings, 1, 0, 0, 0, 0, "eval" },
+    { CHAR_MAX+7, flag, &strict_mode_flag, 1, 1, 0, 0, 0,
+      "strict-mode" },
     { 0, 0, 0, 0, 0, 0, 0, 0, 0 }
   };
 
@@ -513,6 +517,11 @@ int not_parallel;
    warning at the end of the run. */
 
 int clock_skew_detected;
+
+/* Treat warnings as errors. */
+
+int strict_mode_flag;
+
 
 /* Mask of signals that are being caught with fatal_error_signal.  */
 
diff --git a/makeint.h b/makeint.h
index 6f2ee67..6fb62d0 100644
--- a/makeint.h
+++ b/makeint.h
@@ -536,7 +536,7 @@ extern int env_overrides, no_builtin_rules_flag, 
no_builtin_variables_flag;
 extern int print_version_flag, print_directory_flag, check_symlink_flag;
 extern int warn_undefined_variables_flag, trace_flag, posix_pedantic;
 extern int not_parallel, second_expansion, clock_skew_detected;
-extern int rebuilding_makefiles, one_shell;
+extern int rebuilding_makefiles, one_shell, strict_mode_flag;
 
 /* can we run commands via 'sh -c xxx' or must we use batch files? */
 extern int batch_mode_shell;
diff --git a/misc.c b/misc.c
index 37fa1e1..043b5e8 100644
--- a/misc.c
+++ b/misc.c
@@ -280,6 +280,12 @@ error (flocp, fmt, va_alist)
   VA_PRINTF (stderr, fmt, args);
   VA_END (args);
 
+  if (strict_mode_flag)
+    {
+      fputs (_(".  Stop.\n"), stderr);
+      die (2);
+    }
+
   putc ('\n', stderr);
   fflush (stderr);
 }
-- 
1.8.1.4