| dnl Check whether limits.h has needed features. | |
| dnl Copyright 2016-2022 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 WORD_BIT, BOOL_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; | |
| int bw = BOOL_WIDTH; | |
| ]])], | |
| [gl_cv_header_limits_width=yes], | |
| [gl_cv_header_limits_width=no])]) | |
| if test "$gl_cv_header_limits_width" = yes; then | |
| GL_GENERATE_LIMITS_H=false | |
| else | |
| GL_GENERATE_LIMITS_H=true | |
| fi | |
| ]) | |
| dnl Unconditionally enables the replacement of <limits.h>. | |
| AC_DEFUN([gl_REPLACE_LIMITS_H], | |
| [ | |
| AC_REQUIRE([gl_LIMITS_H]) | |
| GL_GENERATE_LIMITS_H=true | |
| ]) |