| # sqrtf.m4 | |
| # serial 4 | |
| 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_SQRTF], | |
| [ | |
| AC_REQUIRE([gl_MATH_H_DEFAULTS]) | |
| AC_REQUIRE([gl_FUNC_SQRT]) | |
| dnl Persuade glibc <math.h> to declare sqrtf(). | |
| AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
| dnl Test whether sqrtf() exists. Assume that sqrtf(), if it exists, is | |
| dnl defined in the same library as sqrt(). | |
| saved_LIBS="$LIBS" | |
| LIBS="$LIBS $SQRT_LIBM" | |
| AC_CHECK_FUNCS([sqrtf]) | |
| LIBS="$saved_LIBS" | |
| if test $ac_cv_func_sqrtf = yes; then | |
| SQRTF_LIBM="$SQRT_LIBM" | |
| else | |
| HAVE_SQRTF=0 | |
| dnl If the function is declared but does not appear to exist, it may be | |
| dnl defined as an inline function. In order to avoid a conflict, we have | |
| dnl to define rpl_sqrtf, not sqrtf. | |
| AC_CHECK_DECLS([sqrtf], [REPLACE_SQRTF=1], , [[#include <math.h>]]) | |
| SQRTF_LIBM="$SQRT_LIBM" | |
| fi | |
| AC_SUBST([SQRTF_LIBM]) | |
| ]) |