[Bug ld/25713] Linker(ld.exe) runs in Windows unable to find file if path length is more than 260 characters.

[fredrick.eisele at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25713

--- Comment #24 from Fred Eisele <fredrick.eisele at gmail dot com> ---
Here is a sample program that I think demonstrates the relevant functions.

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <conio.h>
#include <stdlib.h>
#include <windows.h>

/**
 *
https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfullpathnamew
 *
https://docs.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-multibytetowidechar
 * @return
 */
int main() {
  wchar_t **lpFilePart = {NULL};
  const char prefix[] = "\\\\?\\";
  const char *paths[] = {
      "C:\\tools\\foo.o",
      "C:\\tools\\.\\foo.o",
      "C:\\tools\\msys64\\..\\foo.o",
      ".\\foo.o",
      ".\\increasepath\\increasepath\\increasepath\\increasepath\\"
      "increasepath\\increasepath\\increasepath\\increasepath\\increasepath\\"
      "increasepath\\increasepath\\increasepath\\increasepath\\increasepath\\"
      "increasepath\\increasepath\\increasepath\\increasepath\\increasepath\\"
      "increasepath\\increasepath\\test.o",
      ".\\increasepath\\increasepath\\.\\.\\increasepath\\increasepath\\"
     
"increasepath\\increasepath\\..\\..\\increasepath\\increasepath\\increasepath\\increasepath\\increasepath\\"
      "increasepath\\increasepath\\increasepath\\increasepath\\increasepath\\"
      "increasepath\\increasepath\\increasepath\\increasepath\\increasepath\\"
      "increasepath\\increasepath\\test.o"
  };
  setbuf(stderr, NULL);
  int loopLimit = sizeof(paths)/sizeof(*paths);
  for (int ix = 0; ix < loopLimit; ix++) {
    const char *partPathOrig = paths[ix];
    /*
     * Converting from the partial path from ascii to unicode.
     * Calling with lpWideCharStr set to null returns the length.
     * Calling with cbMultiByte set to -1 includes the terminating null.
     */
    int partPathWSize = MultiByteToWideChar(CP_UTF8, 0, partPathOrig, -1, NULL,
0);
    wchar_t *partPath = calloc(partPathWSize, sizeof(wchar_t));
    MultiByteToWideChar(CP_UTF8, 0, partPathOrig, -1, partPath, partPathWSize);
    fprintf(stderr, "PartPath: size = %d val = %ls\n", partPathWSize,
partPath);
    /*
     * Getting the full path from the provided partial path.
     *
     */
    long fullPathWSize = GetFullPathNameW(partPath, 0, NULL, lpFilePart);
    wchar_t *fullPath = calloc(fullPathWSize, sizeof(wchar_t));
    long copiedPathLen = GetFullPathNameW(partPath, fullPathWSize, fullPath,
lpFilePart);
    fprintf(stderr, "PathLen = %d LastError = %d\n", copiedPathLen,
GetLastError());
    fprintf(stderr, "FullPath: size = %d val: %ls\n", fullPathWSize, fullPath);
    free(fullPath);
    free(partPath);
  }

  return 0;
}

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