[PATCH] Add information how to fix common build error on Windows in symlink-install-tree

[Mateusz Krawczuk <mat.krawczuk@gmail.com>]

By default, Windows doesn't allow to create soft links for user account and only administrator is allowed to do this. To fix this problem you have to raise your permissions or enable Developer Mode, which available since Windows 10. Additional explanation when build fails will allow developer to fix the problem on his computer faster.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1386
Signed-off-by: Mateusz Krawczuk <mat.krawczuk@gmail.com>
---
 scripts/symlink-install-tree.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/scripts/symlink-install-tree.py b/scripts/symlink-install-tree.py
index 67cb86dd52..bb3a2d708c 100644
--- a/scripts/symlink-install-tree.py
+++ b/scripts/symlink-install-tree.py
@@ -7,12 +7,14 @@
 import subprocess
 import sys
 
+
 def destdir_join(d1: str, d2: str) -> str:
     if not d1:
         return d2
     # c:\destdir + c:\prefix must produce c:\destdir\prefix
     return str(PurePath(d1, *PurePath(d2).parts[1:]))
 
+
 introspect = os.environ.get('MESONINTROSPECT')
 out = subprocess.run([*introspect.split(' '), '--installed'],
                      stdout=subprocess.PIPE, check=True).stdout
@@ -28,5 +30,8 @@ def destdir_join(d1: str, d2: str) -> str:
         os.symlink(source, bundle_dest)
     except BaseException as e:
         if not isinstance(e, OSError) or e.errno != errno.EEXIST:
+            if os.name == 'nt':
+                print('\nPlease enable Developer Mode to support soft link '
+                      'without Administrator permission\n')
             print(f'error making symbolic link {dest}', file=sys.stderr)
             raise e
-- 
2.40.1.windows.1