diff options
| -rw-r--r-- | expand.c | 28 |
1 files changed, 27 insertions, 1 deletions
@@ -104,7 +104,28 @@ recursively_expand (v) return value; } -/* Expand a simple reference to variable NAME, which LENGTH chars long. */ +/* Warn that NAME is an undefined variable. */ + +#ifdef __GNUC__ +__inline +#endif +static void +warn_undefined (name, length) + char *name; + unsigned int length; +{ + if (warn_undefined_variables_flag) + { + static const char warnmsg[] = "warning: undefined variable `%.*s'"; + if (reading_filename != 0) + makefile_error (reading_filename, *reading_lineno_ptr, + warnmsg, length, name); + else + error (warnmsg, length, name); + } +} + +/* Expand a simple reference to variable NAME, which is LENGTH chars long. */ #ifdef __GNUC__ __inline @@ -117,6 +138,9 @@ reference_variable (o, name, length) { register struct variable *v = lookup_variable (name, length); + if (v == 0) + warn_undefined (name, length); + if (v != 0 && *v->value != '\0') { char *value = (v->recursive ? recursively_expand (v) : v->value); @@ -254,6 +278,8 @@ variable_expand (line) char *subst_beg, *subst_end, *replace_beg, *replace_end; v = lookup_variable (beg, colon - beg); + if (v == 0) + warn_undefined (beg, colon - beg); subst_beg = colon + 1; count = 0; |