X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ffloorf.m4;h=cc0221bf5fbec069d4b824d851de8149d1ddc14b;hb=1276a2c5f24c0c932426aca9c899fa524d2443f2;hp=96c9b3bdc74277cf4707475c46f4480bf0fff184;hpb=ec062d7a2671739dd977ebde3965fc93f8678a2e;p=gnulib.git

diff --git a/m4/floorf.m4 b/m4/floorf.m4
index 96c9b3bdc..cc0221bf5 100644
--- a/m4/floorf.m4
+++ b/m4/floorf.m4
@@ -1,16 +1,17 @@
-# floorf.m4 serial 7
-dnl Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc.
+# floorf.m4 serial 13
+dnl Copyright (C) 2007, 2009-2014 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_FLOORF],
 [
+  m4_divert_text([DEFAULTS], [gl_floorf_required=plain])
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   dnl Persuade glibc <math.h> to declare floorf().
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
   dnl Test whether floorf() is declared.
-  AC_CHECK_DECLS([floorf], , , [#include <math.h>])
+  AC_CHECK_DECLS([floorf], , , [[#include <math.h>]])
   if test "$ac_cv_have_decl_floorf" = yes; then
     dnl Test whether floorf() can be used without libm.
     gl_FUNC_FLOORF_LIBS
@@ -19,11 +20,54 @@ AC_DEFUN([gl_FUNC_FLOORF],
       dnl libm.so, but not in the libm.so that the compiler uses.
       REPLACE_FLOORF=1
     fi
+    m4_ifdef([gl_FUNC_FLOORF_IEEE], [
+      if test $gl_floorf_required = ieee && test $REPLACE_FLOORF = 0; then
+        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+        AC_CACHE_CHECK([whether floorf works according to ISO C 99 with IEC 60559],
+          [gl_cv_func_floorf_ieee],
+          [
+            save_LIBS="$LIBS"
+            LIBS="$LIBS $FLOORF_LIBM"
+            AC_RUN_IFELSE(
+              [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+]gl_FLOAT_MINUS_ZERO_CODE[
+]gl_FLOAT_SIGNBIT_CODE[
+static float dummy (float f) { return 0; }
+int main (int argc, char *argv[])
+{
+  float (*my_floorf) (float) = argc ? floorf : dummy;
+  /* Test whether floorf (-0.0f) is -0.0f.  */
+  if (signbitf (minus_zerof) && !signbitf (my_floorf (minus_zerof)))
+    return 1;
+  return 0;
+}
+              ]])],
+              [gl_cv_func_floorf_ieee=yes],
+              [gl_cv_func_floorf_ieee=no],
+              [case "$host_os" in
+                         # Guess yes on glibc systems.
+                 *-gnu*) gl_cv_func_floorf_ieee="guessing yes" ;;
+                         # If we don't know, assume the worst.
+                 *)      gl_cv_func_floorf_ieee="guessing no" ;;
+               esac
+              ])
+            LIBS="$save_LIBS"
+          ])
+        case "$gl_cv_func_floorf_ieee" in
+          *yes) ;;
+          *) REPLACE_FLOORF=1 ;;
+        esac
+      fi
+    ])
   else
     HAVE_DECL_FLOORF=0
   fi
   if test $HAVE_DECL_FLOORF = 0 || test $REPLACE_FLOORF = 1; then
-    AC_LIBOBJ([floorf])
+    dnl No libraries are needed to link lib/floorf.c.
     FLOORF_LIBM=
   fi
   AC_SUBST([FLOORF_LIBM])
@@ -41,8 +85,9 @@ AC_DEFUN([gl_FUNC_FLOORF_LIBS],
            # define __NO_MATH_INLINES 1 /* for glibc */
            #endif
            #include <math.h>
+           float (*funcptr) (float) = floorf;
            float x;]],
-         [[x = floorf(x);]])],
+         [[x = funcptr(x) + floorf(x);]])],
       [gl_cv_func_floorf_libm=])
     if test "$gl_cv_func_floorf_libm" = "?"; then
       save_LIBS="$LIBS"
@@ -53,8 +98,9 @@ AC_DEFUN([gl_FUNC_FLOORF_LIBS],
              # define __NO_MATH_INLINES 1 /* for glibc */
              #endif
              #include <math.h>
+             float (*funcptr) (float) = floorf;
              float x;]],
-           [[x = floorf(x);]])],
+           [[x = funcptr(x) + floorf(x);]])],
         [gl_cv_func_floorf_libm="-lm"])
       LIBS="$save_LIBS"
     fi