| # exp2f.m4 | |
| # serial 3 | |
| dnl Copyright (C) 2011-2026 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 This file is offered as-is, without any warranty. | |
| AC_DEFUN([gl_FUNC_EXP2F], | |
| [ | |
| AC_REQUIRE([gl_MATH_H_DEFAULTS]) | |
| AC_REQUIRE([gl_FUNC_EXP2]) | |
| dnl Persuade glibc <math.h> to declare exp2f(). | |
| AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
| dnl Test whether exp2f() exists. Assume that exp2f(), if it exists, is | |
| dnl defined in the same library as exp2(). | |
| saved_LIBS="$LIBS" | |
| LIBS="$LIBS $EXP2_LIBM" | |
| AC_CHECK_FUNCS([exp2f]) | |
| LIBS="$saved_LIBS" | |
| if test $ac_cv_func_exp2f = yes; then | |
| HAVE_EXP2F=1 | |
| EXP2F_LIBM="$EXP2_LIBM" | |
| else | |
| HAVE_EXP2F=0 | |
| dnl Find libraries needed to link lib/exp2f.c. | |
| EXP2F_LIBM="$EXP2_LIBM" | |
| fi | |
| AC_SUBST([EXP2F_LIBM]) | |
| ]) |