maint.mk: avoid sc_prohibit_always-defined_macros failure in coreutils

[gnulib.git] / m4 / float_h.m4

diff --git a/m4/float_h.m4 b/m4/float_h.m4
index 36a07dc..261f1ac 100644 (file)
--- a/m4/float_h.m4
+++ b/m4/float_h.m4
@@ -1,5 +1,5 @@
-# float_h.m4 serial 1
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# float_h.m4 serial 7
+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.
@@ -9,13 +9,41 @@ AC_DEFUN([gl_FLOAT_H],
   AC_REQUIRE([AC_PROG_CC])
   AC_REQUIRE([AC_CANONICAL_HOST])
   FLOAT_H=
+  REPLACE_FLOAT_LDBL=0
   case "$host_os" in
-    beos*)
+    aix* | beos* | openbsd* | mirbsd* | irix*)
       FLOAT_H=float.h
-      gl_ABSOLUTE_HEADER([float.h])
-      ABSOLUTE_FLOAT_H=\"$gl_cv_absolute_float_h\"
-      AC_SUBST([ABSOLUTE_FLOAT_H])
+      ;;
+    freebsd*)
+      case "$host_cpu" in
+changequote(,)dnl
+        i[34567]86 )
+changequote([,])dnl
+          FLOAT_H=float.h
+          ;;
+        x86_64 )
+          # On x86_64 systems, the C compiler may still be generating
+          # 32-bit code.
+          AC_EGREP_CPP([yes],
+            [#if defined __LP64__ || defined __x86_64__ || defined __amd64__
+             yes
+             #endif],
+            [],
+            [FLOAT_H=float.h])
+          ;;
+      esac
+      ;;
+  esac
+  case "$host_os" in
+    aix* | freebsd*)
+      if test -n "$FLOAT_H"; then
+        REPLACE_FLOAT_LDBL=1
+      fi
       ;;
   esac
+  if test -n "$FLOAT_H"; then
+    gl_NEXT_HEADERS([float.h])
+  fi
   AC_SUBST([FLOAT_H])
+  AM_CONDITIONAL([GL_GENERATE_FLOAT_H], [test -n "$FLOAT_H"])
 ])