X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=m4%2Ffloorl.m4;h=62131353c28909509eb07a53137784318940c995;hb=da8054d48dc22e1c051db54049e005d51a006e69;hp=0a5ecb76a2c5bb9419181ec3b3ed4422238aae92;hpb=33f47a8259736ab62fb8f2a3b548e2c0f67ddd97;p=gnulib.git

diff --git a/m4/floorl.m4 b/m4/floorl.m4
index 0a5ecb76a..62131353c 100644
--- a/m4/floorl.m4
+++ b/m4/floorl.m4
@@ -1,5 +1,5 @@
-# floorl.m4 serial 1
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# floorl.m4 serial 11
+dnl Copyright (C) 2007, 2009-2013 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.
@@ -7,42 +7,67 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_FLOORL],
 [
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
+  AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
   dnl Persuade glibc <math.h> to declare floorl().
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Test whether floorl() is declared.
-  AC_CHECK_DECLS([floorl], , , [#include <math.h>])
+  AC_CHECK_DECLS([floorl], , , [[#include <math.h>]])
   if test "$ac_cv_have_decl_floorl" = yes; then
     dnl Test whether floorl() can be used without libm.
-    FLOORL_LIBM=?
-    AC_TRY_LINK([
-       #ifndef __NO_MATH_INLINES
-       # define __NO_MATH_INLINES 1 /* for glibc */
-       #endif
-       #include <math.h>
-       long double x;],
-      [x = floorl(x);],
-      [FLOORL_LIBM=])
+    gl_FUNC_FLOORL_LIBS
     if test "$FLOORL_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>
-         long double x;],
-        [x = floorl(x);],
-        [FLOORL_LIBM="-lm"])
-      LIBS="$save_LIBS"
-    fi
-    if test "$FLOORL_LIBM" = "?"; then
-      FLOORL_LIBM=
+      dnl Sun C 5.0 on Solaris declares floorl() and has it in the system-wide
+      dnl libm.so, but not in the libm.so that the compiler uses.
+      REPLACE_FLOORL=1
     fi
   else
     HAVE_DECL_FLOORL=0
-    AC_LIBOBJ([floorl])
-    FLOORL_LIBM=
   fi
-  AC_SUBST([HAVE_DECL_FLOORL])
+  if test $HAVE_DECL_FLOORL = 0 || test $REPLACE_FLOORL = 1; then
+    dnl Find libraries needed to link lib/floorl.c.
+    if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+      AC_REQUIRE([gl_FUNC_FLOOR])
+      FLOORL_LIBM="$FLOOR_LIBM"
+    else
+      FLOORL_LIBM=
+    fi
+  fi
   AC_SUBST([FLOORL_LIBM])
 ])
+
+# Determines the libraries needed to get the floorl() function.
+# Sets FLOORL_LIBM.
+AC_DEFUN([gl_FUNC_FLOORL_LIBS],
+[
+  gl_CACHE_VAL_SILENT([gl_cv_func_floorl_libm], [
+    gl_cv_func_floorl_libm=?
+    AC_LINK_IFELSE(
+      [AC_LANG_PROGRAM(
+         [[#ifndef __NO_MATH_INLINES
+           # define __NO_MATH_INLINES 1 /* for glibc */
+           #endif
+           #include <math.h>
+           long double (*funcptr) (long double) = floorl;
+           long double x;]],
+         [[x = funcptr (x) + floorl(x);]])],
+      [gl_cv_func_floorl_libm=])
+    if test "$gl_cv_func_floorl_libm" = "?"; then
+      save_LIBS="$LIBS"
+      LIBS="$LIBS -lm"
+      AC_LINK_IFELSE(
+        [AC_LANG_PROGRAM(
+           [[#ifndef __NO_MATH_INLINES
+             # define __NO_MATH_INLINES 1 /* for glibc */
+             #endif
+             #include <math.h>
+             long double (*funcptr) (long double) = floorl;
+             long double x;]],
+           [[x = funcptr (x) + floorl(x);]])],
+        [gl_cv_func_floorl_libm="-lm"])
+      LIBS="$save_LIBS"
+    fi
+  ])
+  FLOORL_LIBM="$gl_cv_func_floorl_libm"
+])