| dnl Check whether limits.h has needed features. |
| |
| dnl Copyright 2016-2019 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| dnl From Paul Eggert. |
| |
| AC_DEFUN_ONCE([gl_LIMITS_H], |
| [ |
| gl_CHECK_NEXT_HEADERS([limits.h]) |
| |
| AC_CACHE_CHECK([whether limits.h has LLONG_MAX, WORD_BIT, ULLONG_WIDTH etc.], |
| [gl_cv_header_limits_width], |
| [AC_COMPILE_IFELSE( |
| [AC_LANG_PROGRAM( |
| [[#ifndef __STDC_WANT_IEC_60559_BFP_EXT__ |
| #define __STDC_WANT_IEC_60559_BFP_EXT__ 1 |
| #endif |
| #include <limits.h> |
| long long llm = LLONG_MAX; |
| int wb = WORD_BIT; |
| int ullw = ULLONG_WIDTH; |
| ]])], |
| [gl_cv_header_limits_width=yes], |
| [gl_cv_header_limits_width=no])]) |
| if test "$gl_cv_header_limits_width" = yes; then |
| LIMITS_H= |
| else |
| LIMITS_H=limits.h |
| fi |
| AC_SUBST([LIMITS_H]) |
| AM_CONDITIONAL([GL_GENERATE_LIMITS_H], [test -n "$LIMITS_H"]) |
| ]) |
| |
| dnl Unconditionally enables the replacement of <limits.h>. |
| AC_DEFUN([gl_REPLACE_LIMITS_H], |
| [ |
| AC_REQUIRE([gl_LIMITS_H]) |
| LIMITS_H='limits.h' |
| AM_CONDITIONAL([GL_GENERATE_LIMITS_H], [test -n "$LIMITS_H"]) |
| ]) |
