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diff -Nrup a/main.c b/main.c
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--- a/main.c 2017-06-11 10:01:27.874528811 -0400
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+++ b/main.c 2017-06-11 10:08:13.235058577 -0400
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@@ -310,6 +310,11 @@ static int print_usage_flag = 0;
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int warn_undefined_variables_flag;
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+/* If nonzero, we should print a warning message
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+ for each attemtp to call an undefined user function. */
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+
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+int warn_undefined_functions_flag;
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+
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/* If nonzero, always build all targets, regardless of whether
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they appear out of date or not. */
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@@ -408,6 +413,8 @@ static const char *const usage[] =
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Consider FILE to be infinitely new.\n"),
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N_("\
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--warn-undefined-variables Warn when an undefined variable is referenced.\n"),
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+ N_("\
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+ --warn-undefined-functions Warn when an undefined user function is called.\n"),
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NULL
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};
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@@ -471,6 +478,8 @@ static const struct command_switch switc
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"warn-undefined-variables" },
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{ CHAR_MAX+6, strlist, &eval_strings, 1, 0, 0, 0, 0, "eval" },
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{ CHAR_MAX+7, string, &sync_mutex, 1, 1, 0, 0, 0, "sync-mutex" },
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+ { CHAR_MAX+8, flag, &warn_undefined_functions_flag, 1, 1, 0, 0, 0,
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+ "warn-undefined-functions" },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }
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};
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diff -Nrup a/makeint.h b/makeint.h
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--- a/makeint.h 2017-06-11 10:01:27.875528807 -0400
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+++ b/makeint.h 2017-06-11 10:09:13.231845428 -0400
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@@ -647,7 +647,7 @@ extern int env_overrides, no_builtin_rul
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extern int print_version_flag, print_directory_flag, check_symlink_flag;
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extern int warn_undefined_variables_flag, trace_flag, posix_pedantic;
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extern int not_parallel, second_expansion, clock_skew_detected;
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-extern int rebuilding_makefiles, one_shell, output_sync, verify_flag;
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+extern int rebuilding_makefiles, one_shell, output_sync, verify_flag, warn_undefined_functions_flag;
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extern const char *default_shell;
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diff -Nrup a/variable.h b/variable.h
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--- a/variable.h 2016-05-21 16:22:32.000000000 -0400
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+++ b/variable.h 2017-06-11 10:10:40.957533767 -0400
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@@ -225,6 +225,15 @@ void undefine_variable_in_set (const cha
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(int)(l), (n)); \
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}while(0)
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+/* Warn that NAME is an undefined function. */
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+
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+#define warn_undefined_function(n,l) do{\
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+ if (warn_undefined_functions_flag) \
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+ error (reading_file, \
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+ _("warning: undefined function `%.*s'"), \
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+ (int)(l), (n)); \
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+ }while(0)
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+
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char **target_environment (struct file *file);
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struct pattern_var *create_pattern_var (const char *target,
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