-# remainderf.m4 serial 1
-dnl Copyright (C) 2012 Free Software Foundation, Inc.
+# remainderf.m4 serial 8
+dnl Copyright (C) 2012-2014 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_REMAINDERF],
[
+ m4_divert_text([DEFAULTS], [gl_remainderf_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_REMAINDER])
+ dnl Persuade glibc <math.h> to declare remainderf().
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
dnl Test whether remainderf() exists. Assume that remainderf(), if it exists, is
dnl defined in the same library as remainder().
save_LIBS="$LIBS"
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+ extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ float remainderf (float, float);
float (*funcptr) (float, float) = remainderf;
float x;
float y;]],
LIBS="$save_LIBS"
if test $gl_cv_func_remainderf = yes; then
REMAINDERF_LIBM="$REMAINDER_LIBM"
+
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $REMAINDERF_LIBM"
+ gl_FUNC_REMAINDERF_WORKS
+ LIBS="$save_LIBS"
+ case "$gl_cv_func_remainderf_works" in
+ *yes) ;;
+ *) REPLACE_REMAINDERF=1 ;;
+ esac
+
+ m4_ifdef([gl_FUNC_REMAINDERF_IEEE], [
+ if test $gl_remainderf_required = ieee && test $REPLACE_REMAINDERF = 0; then
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether remainderf works according to ISO C 99 with IEC 60559],
+ [gl_cv_func_remainderf_ieee],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $REMAINDERF_LIBM"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+float remainderf (float, float);
+/* Compare two numbers with ==.
+ This is a separate function because IRIX 6.5 "cc -O" miscompiles an
+ 'x == x' test. */
+static int
+numeric_equal (float x, float y)
+{
+ return x == y;
+}
+static float dummy (float x, float y) { return 0; }
+int main (int argc, char *argv[])
+{
+ float (*my_remainderf) (float, float) = argc ? remainderf : dummy;
+ float f;
+ /* Test remainderf(...,0.0f).
+ This test fails on OSF/1 5.1. */
+ f = my_remainderf (2.0f, 0.0f);
+ if (numeric_equal (f, f))
+ return 1;
+ return 0;
+}
+ ]])],
+ [gl_cv_func_remainderf_ieee=yes],
+ [gl_cv_func_remainderf_ieee=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_remainderf_ieee="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_remainderf_ieee="guessing no" ;;
+ esac
+ ])
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_remainderf_ieee" in
+ *yes) ;;
+ *) REPLACE_REMAINDERF=1 ;;
+ esac
+ fi
+ ])
else
HAVE_REMAINDERF=0
+ fi
+ if test $HAVE_REMAINDERF = 0 || test $REPLACE_REMAINDERF = 1; then
dnl Find libraries needed to link lib/remainderf.c.
if test $gl_cv_func_remainder_no_libm = yes \
|| test $gl_cv_func_remainder_in_libm = yes; then
[Define to 1 if the remainder() function is available in libc or libm.])
REMAINDERF_LIBM="$REMAINDER_LIBM"
else
- AC_REQUIRE([gl_FUNC_ROUNDF])
- AC_REQUIRE([gl_FUNC_FMAF])
+ AC_REQUIRE([gl_FUNC_FABSF])
+ AC_REQUIRE([gl_FUNC_FMODF])
+ AC_REQUIRE([gl_FUNC_ISNANF])
REMAINDERF_LIBM=
- dnl Append $ROUNDF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates.
+ dnl Append $FABSF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates.
case " $REMAINDERF_LIBM " in
- *" $ROUNDF_LIBM "*) ;;
- *) REMAINDERF_LIBM="$REMAINDERF_LIBM $ROUNDF_LIBM" ;;
+ *" $FABSF_LIBM "*) ;;
+ *) REMAINDERF_LIBM="$REMAINDERF_LIBM $FABSF_LIBM" ;;
esac
- dnl Append $FMAF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates.
+ dnl Append $FMODF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates.
case " $REMAINDERF_LIBM " in
- *" $FMAF_LIBM "*) ;;
- *) REMAINDERF_LIBM="$REMAINDERF_LIBM $FMAF_LIBM" ;;
+ *" $FMODF_LIBM "*) ;;
+ *) REMAINDERF_LIBM="$REMAINDERF_LIBM $FMODF_LIBM" ;;
+ esac
+ dnl Append $ISNANF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates.
+ case " $REMAINDERF_LIBM " in
+ *" $ISNANF_LIBM "*) ;;
+ *) REMAINDERF_LIBM="$REMAINDERF_LIBM $ISNANF_LIBM" ;;
esac
fi
fi
AC_SUBST([REMAINDERF_LIBM])
])
+
+dnl Test whether remainderf() works.
+dnl It runs into an endless loop on IRIX 6.5.
+AC_DEFUN([gl_FUNC_REMAINDERF_WORKS],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CHECK_DECLS_ONCE([alarm])
+ AC_CACHE_CHECK([whether remainderf works], [gl_cv_func_remainderf_works],
+ [
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <math.h>
+#if HAVE_DECL_ALARM
+# include <signal.h>
+# include <unistd.h>
+#endif
+extern
+#ifdef __cplusplus
+"C"
+#endif
+float remainderf (float, float);
+volatile float x;
+volatile float y;
+float z;
+int main ()
+{
+#if HAVE_DECL_ALARM
+ signal (SIGALRM, SIG_DFL);
+ alarm (5);
+#endif
+ /* This test fails on IRIX 6.5. */
+ x = 9.316161e+37f;
+ y = 0.5475547314f;
+ z = remainderf (x, y);
+ return 0;
+}
+]])],
+ [gl_cv_func_remainderf_works=yes],
+ [gl_cv_func_remainderf_works=no],
+ [case "$host_os" in
+ irix*) gl_cv_func_remainderf_works="guessing no";;
+ *) gl_cv_func_remainderf_works="guessing yes";;
+ esac
+ ])
+ ])
+])
projects / gnulib.git / blobdiff