Commit | Line | Data |
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49e4877c PA |
1 | dnl Check whether limits.h has needed features. |
2 | ||
5e8754f9 | 3 | dnl Copyright 2016 Free Software Foundation, Inc. |
49e4877c PA |
4 | dnl This file is free software; the Free Software Foundation |
5 | dnl gives unlimited permission to copy and/or distribute it, | |
6 | dnl with or without modifications, as long as this notice is preserved. | |
7 | ||
8 | dnl From Paul Eggert. | |
9 | ||
10 | AC_DEFUN_ONCE([gl_LIMITS_H], | |
11 | [ | |
12 | gl_CHECK_NEXT_HEADERS([limits.h]) | |
13 | ||
14 | AC_CACHE_CHECK([whether limits.h has ULLONG_WIDTH etc.], | |
15 | [gl_cv_header_limits_width], | |
16 | [AC_COMPILE_IFELSE( | |
17 | [AC_LANG_PROGRAM([[#ifndef __STDC_WANT_IEC_60559_BFP_EXT__ | |
18 | #define __STDC_WANT_IEC_60559_BFP_EXT__ 1 | |
19 | #endif | |
20 | #include <limits.h> | |
21 | int ullw = ULLONG_WIDTH;]])], | |
22 | [gl_cv_header_limits_width=yes], | |
23 | [gl_cv_header_limits_width=no])]) | |
24 | if test "$gl_cv_header_limits_width" = yes; then | |
25 | LIMITS_H= | |
26 | else | |
27 | LIMITS_H=limits.h | |
28 | fi | |
29 | AC_SUBST([LIMITS_H]) | |
30 | AM_CONDITIONAL([GL_GENERATE_LIMITS_H], [test -n "$LIMITS_H"]) | |
31 | ]) |