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Re: AC_CHECK_FUNCS(sigsetjmp)

From: Bruce Korb
Subject: Re: AC_CHECK_FUNCS(sigsetjmp)
Date: Thu, 27 Jul 2006 21:05:01 -0700
User-agent: Mozilla Thunderbird 1.0.7 (X11/20050923)

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.:

          [ACTION-IF-NOT-FOUND], [INCLUDES = `default-includes'])

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