patch 8.1.0743: giving error messages is not flexible
Problem: Giving error messages is not flexible.
Solution: Add semsg(). Change argument from "char_u *" to "char *", also
for msg() and get rid of most MSG macros. (Ozaki Kiichi, closes
#3302) Also make emsg() accept a "char *" argument. Get rid of
an enormous number of type casts.
diff --git a/src/proto/option.pro b/src/proto/option.pro
index b198c75..3da51c6 100644
--- a/src/proto/option.pro
+++ b/src/proto/option.pro
@@ -21,13 +21,13 @@
int set_term_option_alloced(char_u **p);
int was_set_insecurely(char_u *opt, int opt_flags);
void set_string_option_direct(char_u *name, int opt_idx, char_u *val, int opt_flags, int set_sid);
-char_u *check_colorcolumn(win_T *wp);
-char_u *check_stl_option(char_u *s);
+char *check_colorcolumn(win_T *wp);
+char *check_stl_option(char_u *s);
void set_term_option_sctx_idx(char *name, int opt_idx);
int get_option_value(char_u *name, long *numval, char_u **stringval, int opt_flags);
int get_option_value_strict(char_u *name, long *numval, char_u **stringval, int opt_type, void *from);
char_u *option_iter_next(void **option, int opt_type);
-char_u *set_option_value(char_u *name, long number, char_u *string, int opt_flags);
+char *set_option_value(char_u *name, long number, char_u *string, int opt_flags);
char_u *get_term_code(char_u *tname);
char_u *get_highlight_default(void);
char_u *get_encoding_default(void);