X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fjm-macros.m4;h=2899775862eb3ccfa84868d0213a117e62c5ef1b;hb=d7d7b7d2d480289694d07698ae6149b6ee964ff2;hp=35bc9e1de02c04d4808fbad2e71a410c5f9afb14;hpb=27ef3b8633ec7b4aba91535ec51c43f39b42a25a;p=gnulib.git

diff --git a/m4/jm-macros.m4 b/m4/jm-macros.m4
index 35bc9e1de..289977586 100644
--- a/m4/jm-macros.m4
+++ b/m4/jm-macros.m4
@@ -1,4 +1,4 @@
-#serial 23
+#serial 24
 
 dnl Misc type-related macros for fileutils, sh-utils, textutils.
 
@@ -188,6 +188,22 @@ AC_DEFUN(jm_MACROS,
   AC_SUBST(POW_LIBM)
   test $am_cv_func_strtod_needs_libm = yes && POW_LIBM=-lm
 
+  # See if linking `seq' requires -lm.
+  # It does on nearly every system.  The single exception (so far) is
+  # BeOS which doesn't even have a separate math library.
+  AC_SUBST(SEQ_LIBM)
+  ac_seq_body='
+     static double x, y;
+     x = floor (x);
+     x = rint (x);
+     x = modf (x, &y);'
+  AC_TRY_LINK([#include <math.h>], $ac_seq_body, ,
+    [ac_seq_save_LIBS="$LIBS"
+     LIBS="$LIBS -lm"
+     AC_TRY_LINK([#include <math.h>], $ac_seq_body, SEQ_LIBM=-lm)
+     LIBS="$ac_seq_save_LIBS"
+    ])
+
   jm_LANGINFO_CODESET
   jm_GLIBC21
   jm_ICONV
@@ -207,11 +223,10 @@ AC_DEFUN(jm_MACROS,
 # This macro must be invoked before any tests that run the compiler.
 AC_DEFUN(jm_CHECK_ALL_TYPES,
 [
-  # Emit this code into config.h.in.
-  # The ifndef is to avoid redefinition warnings.
-  AH_VERBATIM([_GNU_SOURCE], [#ifndef _GNU_SOURCE
-# define _GNU_SOURCE
-#endif])
+  # FIXME: I shouldn't have to require this macro here.  Rather, it should
+  # be required by any autoconf macro that performs a compile-time test or
+  # otherwise uses confdefs.h.
+  AC_REQUIRE([AC__GNU_SOURCE])
 
   dnl This test must come as early as possible after the compiler configuration
   dnl tests, because the choice of the file model can (in principle) affect