| |
| |
| dnl Copyright (C) 2011-2025 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_ATAN2F], |
| [ |
| AC_REQUIRE([gl_MATH_H_DEFAULTS]) |
| AC_REQUIRE([gl_FUNC_ATAN2]) |
|
|
| dnl Persuade glibc <math.h> to declare atan2f(). |
| AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) |
|
|
| dnl Test whether atan2f() exists. Assume that atan2f(), if it exists, is |
| dnl defined in the same library as atan2(). |
| saved_LIBS="$LIBS" |
| LIBS="$LIBS $ATAN2_LIBM" |
| AC_CHECK_FUNCS([atan2f]) |
| LIBS="$saved_LIBS" |
| if test $ac_cv_func_atan2f = yes; then |
| ATAN2F_LIBM="$ATAN2_LIBM" |
| else |
| HAVE_ATAN2F=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_atan2f, not atan2f. |
| AC_CHECK_DECLS([atan2f], [REPLACE_ATAN2F=1], , [[ |
| ATAN2F_LIBM="$ATAN2_LIBM" |
| fi |
| AC_SUBST([ATAN2F_LIBM]) |
| ]) |
|
|
