1*820c1a8dSHiroo HAYASHIdnl Check whether limits.h has needed features. 2*820c1a8dSHiroo HAYASHI 3*820c1a8dSHiroo HAYASHIdnl Copyright 2016-2021 Free Software Foundation, Inc. 4*820c1a8dSHiroo HAYASHIdnl This file is free software; the Free Software Foundation 5*820c1a8dSHiroo HAYASHIdnl gives unlimited permission to copy and/or distribute it, 6*820c1a8dSHiroo HAYASHIdnl with or without modifications, as long as this notice is preserved. 7*820c1a8dSHiroo HAYASHI 8*820c1a8dSHiroo HAYASHIdnl From Paul Eggert. 9*820c1a8dSHiroo HAYASHI 10*820c1a8dSHiroo HAYASHIAC_DEFUN_ONCE([gl_LIMITS_H], 11*820c1a8dSHiroo HAYASHI[ 12*820c1a8dSHiroo HAYASHI gl_CHECK_NEXT_HEADERS([limits.h]) 13*820c1a8dSHiroo HAYASHI 14*820c1a8dSHiroo HAYASHI AC_CACHE_CHECK([whether limits.h has LLONG_MAX, WORD_BIT, ULLONG_WIDTH etc.], 15*820c1a8dSHiroo HAYASHI [gl_cv_header_limits_width], 16*820c1a8dSHiroo HAYASHI [AC_COMPILE_IFELSE( 17*820c1a8dSHiroo HAYASHI [AC_LANG_PROGRAM( 18*820c1a8dSHiroo HAYASHI [[#ifndef __STDC_WANT_IEC_60559_BFP_EXT__ 19*820c1a8dSHiroo HAYASHI #define __STDC_WANT_IEC_60559_BFP_EXT__ 1 20*820c1a8dSHiroo HAYASHI #endif 21*820c1a8dSHiroo HAYASHI #include <limits.h> 22*820c1a8dSHiroo HAYASHI long long llm = LLONG_MAX; 23*820c1a8dSHiroo HAYASHI int wb = WORD_BIT; 24*820c1a8dSHiroo HAYASHI int ullw = ULLONG_WIDTH; 25*820c1a8dSHiroo HAYASHI ]])], 26*820c1a8dSHiroo HAYASHI [gl_cv_header_limits_width=yes], 27*820c1a8dSHiroo HAYASHI [gl_cv_header_limits_width=no])]) 28*820c1a8dSHiroo HAYASHI if test "$gl_cv_header_limits_width" = yes; then 29*820c1a8dSHiroo HAYASHI LIMITS_H= 30*820c1a8dSHiroo HAYASHI else 31*820c1a8dSHiroo HAYASHI LIMITS_H=limits.h 32*820c1a8dSHiroo HAYASHI fi 33*820c1a8dSHiroo HAYASHI AC_SUBST([LIMITS_H]) 34*820c1a8dSHiroo HAYASHI AM_CONDITIONAL([GL_GENERATE_LIMITS_H], [test -n "$LIMITS_H"]) 35*820c1a8dSHiroo HAYASHI]) 36*820c1a8dSHiroo HAYASHI 37*820c1a8dSHiroo HAYASHIdnl Unconditionally enables the replacement of <limits.h>. 38*820c1a8dSHiroo HAYASHIAC_DEFUN([gl_REPLACE_LIMITS_H], 39*820c1a8dSHiroo HAYASHI[ 40*820c1a8dSHiroo HAYASHI AC_REQUIRE([gl_LIMITS_H]) 41*820c1a8dSHiroo HAYASHI LIMITS_H='limits.h' 42*820c1a8dSHiroo HAYASHI AM_CONDITIONAL([GL_GENERATE_LIMITS_H], [test -n "$LIMITS_H"]) 43*820c1a8dSHiroo HAYASHI]) 44