Mercurial > gnulib
view m4/tanl.m4 @ 40151:db994b489ff2
relocatable-prog: Use Linux code on Android.
* lib/progreloc.c: Treat Android like Linux.
author | Bruno Haible <bruno@clisp.org> |
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date | Sun, 27 Jan 2019 11:37:46 +0100 |
parents | b06060465f09 |
children |
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# tanl.m4 serial 8 dnl Copyright (C) 2010-2019 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. AC_DEFUN([gl_FUNC_TANL], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) dnl Persuade glibc <math.h> to declare tanl(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) TANL_LIBM= AC_CACHE_CHECK([whether tanl() can be used without linking with libm], [gl_cv_func_tanl_no_libm], [ AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> long double (*funcptr) (long double) = tanl; long double x;]], [[return funcptr (x) > 0.4 || tanl (x) > 0.4;]])], [gl_cv_func_tanl_no_libm=yes], [gl_cv_func_tanl_no_libm=no]) ]) if test $gl_cv_func_tanl_no_libm = no; then AC_CACHE_CHECK([whether tanl() can be used with libm], [gl_cv_func_tanl_in_libm], [ save_LIBS="$LIBS" LIBS="$LIBS -lm" AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> long double (*funcptr) (long double) = tanl; long double x;]], [[return funcptr (x) > 0.4 || tanl (x) > 0.4;]])], [gl_cv_func_tanl_in_libm=yes], [gl_cv_func_tanl_in_libm=no]) LIBS="$save_LIBS" ]) if test $gl_cv_func_tanl_in_libm = yes; then TANL_LIBM=-lm fi fi if test $gl_cv_func_tanl_no_libm = yes \ || test $gl_cv_func_tanl_in_libm = yes; then dnl Also check whether it's declared. dnl Mac OS X 10.3 has tanl() in libc but doesn't declare it in <math.h>. AC_CHECK_DECL([tanl], , [HAVE_DECL_TANL=0], [[#include <math.h>]]) else HAVE_DECL_TANL=0 HAVE_TANL=0 dnl Find libraries needed to link lib/tanl.c, lib/trigl.c. if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then AC_REQUIRE([gl_FUNC_TAN]) TANL_LIBM="$TAN_LIBM" else AC_REQUIRE([gl_FUNC_ISNANL]) AC_REQUIRE([gl_FUNC_FLOOR]) AC_REQUIRE([gl_FUNC_FLOORL]) dnl Append $ISNANL_LIBM to TANL_LIBM, avoiding gratuitous duplicates. case " $TANL_LIBM " in *" $ISNANL_LIBM "*) ;; *) TANL_LIBM="$TANL_LIBM $ISNANL_LIBM" ;; esac dnl Append $FLOOR_LIBM to TANL_LIBM, avoiding gratuitous duplicates. case " $TANL_LIBM " in *" $FLOOR_LIBM "*) ;; *) TANL_LIBM="$TANL_LIBM $FLOOR_LIBM" ;; esac dnl Append $FLOORL_LIBM to TANL_LIBM, avoiding gratuitous duplicates. case " $TANL_LIBM " in *" $FLOORL_LIBM "*) ;; *) TANL_LIBM="$TANL_LIBM $FLOORL_LIBM" ;; esac fi fi AC_SUBST([TANL_LIBM]) ])