realpath(path,NULL)

[Bruno Haible]

Hi Jim,

It was reported in <https://savannah.gnu.org/bugs/?33273> that the test program
of canonicalize.m4 leads to a crash and a dialog box while running 'configure'
on MacOS X 10.4.

Actually I reproduce it also on MacOS X 10.5, FreeBSD 6.4, OpenBSD 4.4 with
this small test program:
==============================================================
#include <stdlib.h>
int
main ()
{
  char *name1 = realpath ("conftest.a", NULL);
  char *name2 = realpath ("conftest.b/../conftest.a", NULL);
  char *name3 = realpath ("conftest.a/", NULL);
  return !(name1 && *name1 == '/' && !name2 && !name3);
}
===============================================================

Here is a proposed fix:


2011-05-11  Bruno Haible  <address@hidden>

        canonicalize, canonicalize-lgpl: Avoid crash dialog on MacOS X.
        * m4/canonicalize.m4 (gl_FUNC_REALPATH_WORKS): Add GL_NOCRASH code.
        * modules/canonicalize (Depends-on): Add 'nocrash'.
        * modules/canonicalize-lgpl (Depends-on): Likewise.
        * doc/posix-functions/realpath.texi: Update platforms list.
        Reported by Ryan Schmidt <address@hidden>.

--- doc/posix-functions/realpath.texi.orig      Wed May 11 13:38:39 2011
+++ doc/posix-functions/realpath.texi   Wed May 11 13:28:13 2011
@@ -14,7 +14,7 @@
 @item
 This function does not allow for a NULL @samp{resolved} parameter on
 some platforms:
-Solaris 10.
+MacOS X 10.5, FreeBSD 6.4, OpenBSD 4.4, Solaris 10.
 @item
 This function does not always return an absolute path on some
 platforms:
--- m4/canonicalize.m4.orig     Wed May 11 13:38:39 2011
+++ m4/canonicalize.m4  Wed May 11 13:38:37 2011
@@ -1,4 +1,4 @@
-# canonicalize.m4 serial 17
+# canonicalize.m4 serial 18
 
 dnl Copyright (C) 2003-2007, 2009-2011 Free Software Foundation, Inc.
 
@@ -64,6 +64,7 @@
     touch conftest.a
     AC_RUN_IFELSE([
       AC_LANG_PROGRAM([[
+        ]GL_NOCRASH[
         #include <stdlib.h>
       ]], [[
         int result = 0;
--- modules/canonicalize.orig   Wed May 11 13:38:39 2011
+++ modules/canonicalize        Wed May 11 13:31:35 2011
@@ -15,6 +15,7 @@
 hash-triple
 lstat
 memmove
+nocrash
 pathmax
 sys_stat
 xalloc
--- modules/canonicalize-lgpl.orig      Wed May 11 13:38:39 2011
+++ modules/canonicalize-lgpl   Wed May 11 13:31:35 2011
@@ -9,6 +9,7 @@
 Depends-on:
 extensions
 stdlib
+nocrash
 alloca-opt      [test $HAVE_CANONICALIZE_FILE_NAME = 0 || test 
$REPLACE_CANONICALIZE_FILE_NAME = 1]
 errno           [test $HAVE_CANONICALIZE_FILE_NAME = 0 || test 
$REPLACE_CANONICALIZE_FILE_NAME = 1]
 lstat           [test $HAVE_CANONICALIZE_FILE_NAME = 0 || test 
$REPLACE_CANONICALIZE_FILE_NAME = 1]
-- 
In memoriam Paul Bloomquist <http://en.wikipedia.org/wiki/Paul_Bloomquist>