Re: [gambit-list] Getting rid of compiler warnings.

This is actually all fixed.

For reasons I have no idea why, they can be fixed via:

1) using "compile-file" instead of "compile-file-to-c & link-flat"

2) using cc-options: "-Wno-write-strings"

On Mon, Feb 23, 2009 at 11:38 PM, lowly coder lowlycoder@huoyanjinjing.comwrote:

Hi!

There are two compiler warnings I want to get rid of. Please enlighten me. (1) is from gcc, (2) is from gsc.

(1) this one deals with const char * vs char * if I try to do (pointer char), I get the following error: ~/test$ cat error1.scm; echo '-----'; gsc error1.scm; echo '-----'; gsc -link error1; gsi -e '(load "error1")' (c-declare #<<c-declare-end #include <stdio.h> void foo(const char* str) { fprintf(stderr, "printing: %s\n", str); } c-declare-end )

(define foo (c-lambda ((pointer char)) void "foo"))

(foo "hello world")

error1.c:45: warning: deprecated conversion from string constant to ?char*? error1.c:51: warning: deprecated conversion from string constant to ?char*? error1.c:51: warning: deprecated conversion from string constant to ?char*? error1.c:51: warning: deprecated conversion from string constant to ?char*? error1.c:191: warning: deprecated conversion from string constant to ?char*?

---

*** ERROR IN ##load -- (Argument 1) Can't convert to C pointer (foo "hello world")

now, if I use char-string instead, I get an annoying error while compiling with gcc:

~/test$ cat error2.scm; echo '-----'; gsc error2.scm; echo '-----'; gsc -link error2; gsi -e '(load "error2")' (c-declare #<<c-declare-end #include <stdio.h> void foo(const char* str) { fprintf(stderr, "printing: %s\n", str); } c-declare-end )

(define foo (c-lambda (char-string) void "foo"))

(foo "hello world")

error2.c:42: warning: deprecated conversion from string constant to ?char*? error2.c:42: warning: deprecated conversion from string constant to ?char*? error2.c:42: warning: deprecated conversion from string constant to ?char*? error2.c:174: warning: deprecated conversion from string constant to ?char*?

---

printing: hello world

I don't want to tell gcc to ignore this error. I want to get gambit to generate correct code. How do I do that?

(2) This is shown right in section 3.4.2 of the gambit reference manual:

 $ gsc -link -flat -o foo.o1.c m2 m3
 m2:
 m3:
 *** WARNING -- "cons" is not defined,
 ***            referenced in: ("m2.c")
 *** WARNING -- "map" is not defined,
 ***            referenced in: ("m3.c")
 *** WARNING -- "newline" is not defined,
 ***            referenced in: ("m3.c")
 *** WARNING -- "write" is not defined,
 ***            referenced in: ("m3.c")

Is there something I can put in m2.scm / m3.scm like "don't worry about cons / map / newline / write" ?

 ; File: "m2.scm"
 (c-declare "extern int power_of_2 ();")
 (define pow2 (c-lambda (int) int "power_of_2"))
 (define (twice x) (cons x x))

 ; File: "m3.scm"
 (write (map twice (map pow2 '(1 2 3 4)))) (newline)

aside: I realize these are just small warnings. However, I'm doing alot of C-FFi library wrapping, and it's getting to be more than one screenful of warnings. This is bad as (1) I like things to be clean and (2) it makes it hard to view actual errors since there are so many silly warnings.

Thanks!