X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ffloorf.m4;h=83bfc78bc59c5ed9f57fa3e09da0d729ebae9706;hb=9723bfe9bb9af8309314ad6230f7661000ba03b1;hp=fb17a5ea1af8dcafd39b01bf437ea82a051ae578;hpb=23737e3dd01ef6ac0ae9134300a4c66807ae00d2;p=gnulib.git

diff --git a/m4/floorf.m4 b/m4/floorf.m4
index fb17a5ea1..83bfc78bc 100644
--- a/m4/floorf.m4
+++ b/m4/floorf.m4
@@ -1,16 +1,17 @@
-# floorf.m4 serial 6
-dnl Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc.
+# floorf.m4 serial 11
+dnl Copyright (C) 2007, 2009-2011 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_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 +20,47 @@ 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 $REPLACE_FLOORF = 0; then
+        AC_CACHE_CHECK([whether floorf works according to ISO C 99 with IEC 60559],
+          [gl_cv_func_floorf_ieee],
+          [
+            save_LIBS="$LIBS"
+            LIBS="$LIBS $FLOORF_LIBM"
+            AC_RUN_IFELSE(
+              [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+]gl_FLOAT_MINUS_ZERO_CODE[
+]gl_FLOAT_SIGNBIT_CODE[
+static float dummy (float f) { return 0; }
+int main (int argc, char *argv[])
+{
+  float (*my_floorf) (float) = argc ? floorf : dummy;
+  /* Test whether floorf (-0.0f) is -0.0f.  */
+  if (signbitf (minus_zerof) && !signbitf (my_floorf (minus_zerof)))
+    return 1;
+  return 0;
+}
+              ]])],
+              [gl_cv_func_floorf_ieee=yes],
+              [gl_cv_func_floorf_ieee=no],
+              [gl_cv_func_floorf_ieee="guessing no"])
+            LIBS="$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 $REPLACE_FLOORF = 1; then
-    AC_LIBOBJ([floorf])
+    dnl No libraries are needed to link lib/floorf.c.
     FLOORF_LIBM=
   fi
   AC_SUBST([FLOORF_LIBM])
@@ -35,24 +72,26 @@ AC_DEFUN([gl_FUNC_FLOORF_LIBS],
 [
   gl_CACHE_VAL_SILENT([gl_cv_func_floorf_libm], [
     gl_cv_func_floorf_libm=?
-    AC_TRY_LINK([
-       #ifndef __NO_MATH_INLINES
-       # define __NO_MATH_INLINES 1 /* for glibc */
-       #endif
-       #include <math.h>
-       float x;],
-      [x = floorf(x);],
+    AC_LINK_IFELSE(
+      [AC_LANG_PROGRAM(
+         [[#ifndef __NO_MATH_INLINES
+           # define __NO_MATH_INLINES 1 /* for glibc */
+           #endif
+           #include <math.h>
+           float x;]],
+         [[x = floorf(x);]])],
       [gl_cv_func_floorf_libm=])
     if test "$gl_cv_func_floorf_libm" = "?"; then
       save_LIBS="$LIBS"
       LIBS="$LIBS -lm"
-      AC_TRY_LINK([
-         #ifndef __NO_MATH_INLINES
-         # define __NO_MATH_INLINES 1 /* for glibc */
-         #endif
-         #include <math.h>
-         float x;],
-        [x = floorf(x);],
+      AC_LINK_IFELSE(
+        [AC_LANG_PROGRAM(
+           [[#ifndef __NO_MATH_INLINES
+             # define __NO_MATH_INLINES 1 /* for glibc */
+             #endif
+             #include <math.h>
+             float x;]],
+           [[x = floorf(x);]])],
         [gl_cv_func_floorf_libm="-lm"])
       LIBS="$save_LIBS"
     fi