[dm-devel] Re: [lvm-devel] new device-mapper required to build latest lvm from cvs

["Jun'ichi Nomura" <j-nomura ce jp nec com>]

Hi,

Jim Meyering wrote:
> FYI, with the change I've just committed,
> 
>   http://sources.redhat.com/ml/lvm2-cvs/2007-07/msg00035.html
> 
> you now need a device-mapper library and headers built from
> today's cvs sources.  Otherwise, you'll get compile warnings
> and eventually a link error complaining about missing dm_fclose.

This change introduces an error for static build.

/usr/local/lib/libdevmapper.a(libdm-file.o): In function `create_dir':
/work/device-mapper/lib/libdm-file.c:59: multiple definition of `create_dir'
../lib/liblvm.a(lvm-file.o):/work/LVM2/lib/misc/lvm-file.c:177: first defined here
/usr/bin/ld: Warning: size of symbol `create_dir' changed from 176 in ../lib/liblvm.a(lvm-file.o) to 187 in /usr/local/lib/libdevmapper.a(libdm-file.o)

lvm_fclose() calls dm_fclose(), which cause the linker to
bring libdm-file.o in liblvm.a. Then there happens a conflict
of create_dir().

Attached is a patch for device-mapper to rename the function
and export it. It alone fixes the build error.

A patch for LVM2 to use the exported function will follow.

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation of America

lvm_fclose() calls dm_fclose(), which cause the static linker to
bring libdm-file.o in liblvm.a. Then there happens a conflict
of create_dir().

Fix the following build error:

/usr/local/lib/libdevmapper.a(libdm-file.o): In function `create_dir':
/work/device-mapper/lib/libdm-file.c:59: multiple definition of `create_dir'
../lib/liblvm.a(lvm-file.o):/work/LVM2/lib/misc/lvm-file.c:177: first defined here
/usr/bin/ld: Warning: size of symbol `create_dir' changed from 176 in ../lib/liblvm.a(lvm-file.o) to 187 in /usr/local/lib/libdevmapper.a(libdm-file.o)

Index: device-mapper.work/lib/.exported_symbols
===================================================================
--- device-mapper.work.orig/lib/.exported_symbols
+++ device-mapper.work/lib/.exported_symbols
@@ -1,6 +1,7 @@
 dm_lib_release
 dm_lib_exit
 dm_driver_version
+dm_create_dir
 dm_fclose
 dm_get_library_version
 dm_log
Index: device-mapper.work/lib/libdevmapper.h
===================================================================
--- device-mapper.work.orig/lib/libdevmapper.h
+++ device-mapper.work/lib/libdevmapper.h
@@ -629,6 +629,12 @@ char *dm_basename(const char *path);
  **************************/
 
 /*
+ * Create a directory (with parent directories if necessary).
+ * Returns 1 on success, 0 on failure.
+ */
+int dm_create_dir(const char *dir);
+
+/*
  * Close a stream, with nicer error checking than fclose's.
  * Derived from gnulib's close-stream.c.
  *
Index: device-mapper.work/lib/libdm-file.c
===================================================================
--- device-mapper.work.orig/lib/libdm-file.c
+++ device-mapper.work/lib/libdm-file.c
@@ -55,7 +55,7 @@ out:
 	return r;
 }
 
-int create_dir(const char *dir)
+int dm_create_dir(const char *dir)
 {
 	struct stat info;
 
Index: device-mapper.work/lib/ioctl/libdm-iface.c
===================================================================
--- device-mapper.work.orig/lib/ioctl/libdm-iface.c
+++ device-mapper.work/lib/ioctl/libdm-iface.c
@@ -228,7 +228,7 @@ static int _create_control(const char *c
 		return 0;
 
 	old_umask = umask(0022);
-	ret = create_dir(dm_dir());
+	ret = dm_create_dir(dm_dir());
 	umask(old_umask);
 
 	if (!ret)