Fix MS-Windows build as followup to pdumper executable lookup

* src/w32.c (w32_my_exename): New function.
* src/w32.h (w32_my_exename): Add prototype.
* src/emacs.c (load_pdump_find_executable) [WINDOWSNT]: Find
the actual file name of the program without looking along
PATH, by calling w32_my_exename.

* nt/mingw-cfg.site (ac_cv_func_canonicalize_file_name)
(ac_cv_func_realpath, gl_cv_func_realpath_works): Disable
testing.
* nt/gnulib-cfg.mk (OMIT_GNULIB_MODULE_canonicalize-lgpl): Set
to true.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/w32.c b/src/w32.c
index 833ff4c7e4a..b2d1ffcf82b 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -9988,6 +9988,21 @@ w32_relocate (const char *epath_dir)
   return epath_dir;
 }
 
+/* Return the full absolute name of the running executable.
+
+   Note: this function is called early during startup, when Unicode
+   file name are not yet supported.  */
+char *
+w32_my_exename (void)
+{
+  static char exename[MAX_PATH];
+  if (!GetModuleFileNameA (NULL, exename, MAX_PATH))
+    return NULL;
+  /* FIXME: Resolve possible symlinks in the last component of
+     exename, i.e. if the executable itself is a symlink.  */
+  return exename;
+}
+
 /*
 	globals_of_w32 is used to initialize those global variables that
 	must always be initialized on startup even when the global variable