configure: Avoid compiler warnings in ncurses test
Recent versions of ncurses (at least version 6.2) have some function
prototype declarations different in parameter types. Because of the
incompatible-type warning, some tests in "configure" fail when compiled
with the -Werror option. This commit rewrites the test so it does not
produce warnings when it should succeed.
yash/trunk/configure (diff)| @@ -1,5 +1,5 @@ | ||
| 1 | 1 | # Manually written configuration script for yash |
| 2 | -# (C) 2007-2021 magicant | |
| 2 | +# (C) 2007-2022 magicant | |
| 3 | 3 | # |
| 4 | 4 | # This program is free software: you can redistribute it and/or modify |
| 5 | 5 | # it under the terms of the GNU General Public License as published by |
| @@ -30,7 +30,7 @@ | ||
| 30 | 30 | |
| 31 | 31 | target="yash" |
| 32 | 32 | version="2.52" |
| 33 | -copyright="Copyright (C) 2007-2021 magicant" | |
| 33 | +copyright="Copyright (C) 2007-2022 magicant" | |
| 34 | 34 | |
| 35 | 35 | # object files to be linked as `yash' |
| 36 | 36 | objs='$(MAIN_OBJS)' |
| @@ -726,15 +726,24 @@ | ||
| 726 | 726 | #include <ncursesw/ncurses.h> |
| 727 | 727 | #endif |
| 728 | 728 | #include <${i%:*}> |
| 729 | +int putchar(int); | |
| 730 | + | |
| 729 | 731 | int main(void) { |
| 730 | - int (*f1)(char *, int, int *) = setupterm; f1("", 0, 0); | |
| 731 | - int (*f2)(char *) = tigetflag; f2(""); | |
| 732 | - int (*f3)(char *) = tigetnum; f3(""); | |
| 733 | - char *(*f4)(char *) = tigetstr; f4(""); | |
| 734 | - int (*f5)(const char *, int, int (*)(int)) = tputs; f5("", 0, 0); | |
| 735 | -/* char *(*f6)(char *, long,long,long,long,long,long,long,long,long) = tparm; | |
| 736 | - f6("", 0, 0, 0, 0, 0, 0, 0, 0, 0); */ | |
| 737 | - int (*f7)(TERMINAL *) = del_curterm; f7(cur_term); | |
| 732 | +/* Undeclared identifiers are a syntax error in C99, but many compilers assume | |
| 733 | + * implicit declarations when they appear in a function call. We force compilers | |
| 734 | + * to reject undeclared functions by using them in a non-call expression. */ | |
| 735 | +(void) setupterm, (void) tigetflag, (void) tigetnum, (void) tigetstr; | |
| 736 | +(void) tparm, (void) tputs, (void) del_curterm, (void) cur_term; | |
| 737 | + | |
| 738 | +/* Check if we can actually call them with arguments of suitable types */ | |
| 739 | +int i1 = setupterm("", 1, (int*)0); | |
| 740 | +int i2 = tigetflag(""); | |
| 741 | +int i3 = tigetnum(""); | |
| 742 | +char *s1 = tigetstr(""); | |
| 743 | +char *s2 = tparm(s1, (long) i1, (long) i2, (long) i3, 0L, 0L, 0L, 0L, 0L, 0L); | |
| 744 | +int i4 = tputs(s2, 1, putchar); | |
| 745 | +(void) del_curterm(cur_term); | |
| 746 | +return i4; | |
| 738 | 747 | } |
| 739 | 748 | END |
| 740 | 749 | trycompile |
magicant