[PATCH] ld: don't use SAME_INODE for the duplicate-script check on hosts without inodes

[Alan Modra]

On Mon, Aug 17, 2026 at 04:59:00PM +0000, Cole Munz wrote:
> The Windows CRT sets st_ino to 0 for every file. The guard that survived
> only rejects st_ino == 0 && st_dev == 0, and st_dev is the drive number,
> so on D: it is 3 and the guard passes. Every file on the drive then
> compares equal to every other file

That says there is a bug in SAME_INODE, and in upstream gnulib too.
I will apply the following.

	* same-inode.h (SAME_INODE): Do not test st_dev on windows to
	validate st_dev/st_ino comparison.

diff --git a/include/same-inode.h b/include/same-inode.h
index 9d9049843d1..d9aea7b006f 100644
--- a/include/same-inode.h
+++ b/include/same-inode.h
@@ -28,11 +28,12 @@
      && (a).st_dev == (b).st_dev)
 # elif defined _WIN32 && ! defined __CYGWIN__
    /* Native Windows.  */
-   /* stat() and fstat() set st_dev and st_ino to 0 if information about
+   /* stat() and fstat() set st_ino to 0 if information about
       the inode is not available.  */
 #  define SAME_INODE(a, b) \
-    (!((a).st_ino == 0 && (a).st_dev == 0) \
-     && (a).st_ino == (b).st_ino && (a).st_dev == (b).st_dev)
+    ((a).st_ino != 0			\
+     && (a).st_ino == (b).st_ino	\
+     && (a).st_dev == (b).st_dev)
 # else
 #  define SAME_INODE(a, b)    \
     ((a).st_ino == (b).st_ino \

-- 
Alan Modra