diff options
Diffstat (limited to 'gnulib/m4/atanl.m4')
m--------- | gnulib | 0 | ||||
-rw-r--r-- | gnulib/m4/atanl.m4 | 74 |
2 files changed, 74 insertions, 0 deletions
diff --git a/gnulib b/gnulib deleted file mode 160000 -Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1 diff --git a/gnulib/m4/atanl.m4 b/gnulib/m4/atanl.m4 new file mode 100644 index 0000000..330ad77 --- /dev/null +++ b/gnulib/m4/atanl.m4 @@ -0,0 +1,74 @@ +# atanl.m4 serial 6 +dnl Copyright (C) 2010-2011 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_ATANL], +[ + AC_REQUIRE([gl_MATH_H_DEFAULTS]) + AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) + + dnl Persuade glibc <math.h> to declare atanl(). + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + + ATANL_LIBM= + AC_CACHE_CHECK([whether atanl() can be used without linking with libm], + [gl_cv_func_atanl_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 x;]], + [[return atanl (x) > 1;]])], + [gl_cv_func_atanl_no_libm=yes], + [gl_cv_func_atanl_no_libm=no]) + ]) + if test $gl_cv_func_atanl_no_libm = no; then + AC_CACHE_CHECK([whether atanl() can be used with libm], + [gl_cv_func_atanl_in_libm], + [ + save_LIBS="$LIBS" + LIBS="$LIBS -lm" + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + long double x;]], + [[return atanl (x) > 1;]])], + [gl_cv_func_atanl_in_libm=yes], + [gl_cv_func_atanl_in_libm=no]) + LIBS="$save_LIBS" + ]) + if test $gl_cv_func_atanl_in_libm = yes; then + ATANL_LIBM=-lm + fi + fi + if test $gl_cv_func_atanl_no_libm = yes \ + || test $gl_cv_func_atanl_in_libm = yes; then + dnl Also check whether it's declared. + dnl MacOS X 10.3 has atanl() in libc but doesn't declare it in <math.h>. + AC_CHECK_DECL([atanl], , [HAVE_DECL_ATANL=0], [[#include <math.h>]]) + else + HAVE_DECL_ATANL=0 + HAVE_ATANL=0 + dnl Find libraries needed to link lib/atanl.c. + if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then + AC_REQUIRE([gl_FUNC_ATAN]) + ATANL_LIBM="$ATAN_LIBM" + else + AC_REQUIRE([gl_FUNC_ISNANL]) + dnl Append $ISNANL_LIBM to ATANL_LIBM, avoiding gratuitous duplicates. + case " $ATANL_LIBM " in + *" $ISNANL_LIBM "*) ;; + *) ATANL_LIBM="$ATANL_LIBM $ISNANL_LIBM" ;; + esac + fi + fi + AC_SUBST([ATANL_LIBM]) +]) |