URL:
<https://savannah.gnu.org/support/?110660>
Summary: AC_LANG_INT_SAVE (used by AC_CHECK_SIZEOF) includes
stdlib.h without checking whether it actually exists
Project: Autoconf
Submitted by: alainknaff
Submitted on: Tue 17 May 2022 08:15:00 PM CEST
Category: None
Priority: 5 - Normal
Severity: 3 - Normal
Status: None
Privacy: Public
Assigned to: None
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Operating System: None
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Details:
if stdlib.h doesn't exist, AC_CHECK_SIZEOF(size_t) fails with
conftest.c:80: stdlib.h: No such file or directory
configure:5433: error: cannot compute sizeof (size_t)
Code quoted in config.log includes the following:
...
| #ifdef HAVE_UNISTD_H
| # include <unistd.h>
| #endif
| static long int longval () { return (long int) (sizeof (size_t)); }
| static unsigned long int ulongval () { return (long int) (sizeof (size_t));
}
| #include <stdio.h>
| #include <stdlib.h>
| int
| main ()
| {
|
| FILE *f = fopen ("conftest.val", "w");
| if (! f)
| return 1;
| if (((long int) (sizeof (size_t))) < 0)
| {
| long int i = longval ();
| if (i != ((long int) (sizeof (size_t))))
| return 1;
| fprintf (f, "%ld", i);
| }
| else
| {
| unsigned long int i = ulongval ();
| if (i != ((long int) (sizeof (size_t))))
| return 1;
| fprintf (f, "%lu", i);
| }
| /* Do not output a trailing newline, as this causes \r\n confusion
| on some platforms. */
| return ferror (f) || fclose (f) != 0;
...
As you see, most includes are correctly protected by #ifdef HAVE_*, except
stdio.h and stdlib.h
This fails if stdlib.h doesn't actually exist. Most other tests until then run
fine (AC_CHECK_LIB, AC_CHECK_HEADERS, AC_CHECK_TYPES).
N.B. I _do_ have AC_CHECK_HEADERS(stdlib.h) early in my configure.in, it
correctly determines that stdlib.h doesn't exist, but that result is not used
by AC_LANG_INT_SAVE
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