-# cbrtl.m4 serial 1
-dnl Copyright (C) 2012 Free Software Foundation, Inc.
+# cbrtl.m4 serial 5
+dnl Copyright (C) 2012-2013 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_CBRTL],
[
+ m4_divert_text([DEFAULTS], [gl_cbrtl_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_REQUIRE([gl_FUNC_CBRT])
+ dnl Persuade glibc <math.h> to declare cbrtl().
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
dnl Test whether cbrtl() exists. Assume that cbrtl(), if it exists, is
dnl defined in the same library as cbrt().
save_LIBS="$LIBS"
dnl Also check whether it's declared.
dnl IRIX 6.5 has cbrtl() in libm but doesn't declare it in <math.h>.
AC_CHECK_DECL([cbrtl], , [HAVE_DECL_CBRTL=0], [[#include <math.h>]])
+
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $CBRTL_LIBM"
+ gl_FUNC_CBRTL_WORKS
+ LIBS="$save_LIBS"
+ case "$gl_cv_func_cbrtl_works" in
+ *yes) ;;
+ *) REPLACE_CBRTL=1 ;;
+ esac
+
+ m4_ifdef([gl_FUNC_CBRTL_IEEE], [
+ if test $gl_cbrtl_required = ieee && test $REPLACE_CBRTL = 0; then
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether cbrtl works according to ISO C 99 with IEC 60559],
+ [gl_cv_func_cbrtl_ieee],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $CBRTL_LIBM"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
+]gl_LONG_DOUBLE_SIGNBIT_CODE[
+static long double dummy (long double x) { return 0; }
+int main (int argc, char *argv[])
+{
+ extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ long double cbrtl (long double);
+ long double (*my_cbrtl) (long double) = argc ? cbrtl : dummy;
+ long double f;
+ /* Test cbrtl(-0.0).
+ This test fails on IRIX 6.5. */
+ f = my_cbrtl (minus_zerol);
+ if (!(f == 0.0L) || (signbitl (minus_zerol) && !signbitl (f)))
+ return 1;
+ return 0;
+}
+ ]])],
+ [gl_cv_func_cbrtl_ieee=yes],
+ [gl_cv_func_cbrtl_ieee=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_cbrtl_ieee="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_cbrtl_ieee="guessing no" ;;
+ esac
+ ])
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_cbrtl_ieee" in
+ *yes) ;;
+ *) REPLACE_CBRTL=1 ;;
+ esac
+ fi
+ ])
else
HAVE_CBRTL=0
HAVE_DECL_CBRTL=0
+ fi
+ if test $HAVE_CBRTL = 0 || test $REPLACE_CBRTL = 1; then
dnl Find libraries needed to link lib/cbrtl.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
CBRTL_LIBM="$CBRT_LIBM"
fi
AC_SUBST([CBRTL_LIBM])
])
+
+dnl Test whether cbrtl() works.
+dnl On OpenBSD 5.1/SPARC, cbrtl(16.0L) is = 1.2599...
+AC_DEFUN([gl_FUNC_CBRTL_WORKS],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether cbrtl works], [gl_cv_func_cbrtl_works],
+ [
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <math.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+long double cbrtl (long double);
+volatile long double x;
+long double y;
+int main ()
+{
+ x = 16.0L;
+ y = cbrtl (x);
+ if (y < 2.0L)
+ return 1;
+ return 0;
+}
+]])],
+ [gl_cv_func_cbrtl_works=yes],
+ [gl_cv_func_cbrtl_works=no],
+ [case "$host_os" in
+ openbsd*) gl_cv_func_cbrtl_works="guessing no";;
+ *) gl_cv_func_cbrtl_works="guessing yes";;
+ esac
+ ])
+ ])
+])