Re: AC_CHECK_FUNCS(sigsetjmp)

[Bruce Korb]

Eric Blake wrote:
> > "not required to be a normal function" implies that it is
> > common knowledge that everybody knows you have to roll your
> > own AC macro?
>
>
> Have you tried AC_CHECK_DECLS instead?  You really are checking
> whether sigsetjmp is declared and you can compile with it, not
> whether it is a function and you can link with it.

Like this?

  AC_CHECK_DECLS([setjmp, sigsetjmp],, [setjmp.h])

configure:28593: result: no
configure:28609: checking whether sigsetjmp is declared
configure:28633: /local/bin/gcc -c -g  conftest.c >&5
conftest.c: In function 'main':
conftest.c:141: error: 'sigsetjmp' undeclared (first use in this function)
conftest.c:141: error: (Each undeclared identifier is reported only once
conftest.c:141: error: for each function it appears in.)
configure:28639: $? = 1
configure: failed program was:
[[[..........]]]
| int
| main ()
| {
| #ifndef sigsetjmp
|   char *p = (char *) sigsetjmp;
| #endif
|
|   ;
|   return 0;
| }

I am guessing on how I am supposed to use the macro.  The autoconf
manual does not give an example on what is meant with the
``[ INCLUDES = `default-includes']'' thing.  e.g.:


 - Macro: AC_CHECK_DECLS (SYMBOLS, [ACTION-IF-FOUND],
          [ACTION-IF-NOT-FOUND], [INCLUDES = `default-includes'])