Building qt 5.15 with mingw on windows error cant find qfreetypefontdatabase_p.h

[DanRechtsaf]

Hello,

I want to build qt 5.15 using mingw on windows, but after around 10 minutes it fails with error:

........\include\QtFontDatabaseSupport\5.15.4/QtFontDatabaseSupport/private/qfreetypefontdatabase_p.h:1:10: fatal error: ../../../../../src/platformsupport/fontdatabases/freetype/qfreetypefontdatabase_p.h: No such file or directory
#include "../../../../../src/platformsupport/fontdatabases/freetype/qfreetypefontdatabase_p.h"

Steps to reproduce, on Windows 11:

• Have mingw 8.10 64bit installed with the qt online installer.
• Downloaded and unzipped qt-everywhere-src-5.15.4.zip
• Make sure mingw is in the PATH
• call configure.bat with (Note: I have put this in another batch file):
  ./configure ^
  -release ^
  -opensource ^
  -confirm-license ^
  -skip qtcharts ^
  -skip qtvirtualkeyboard ^
  -skip qtdatavis3d ^
  -silent ^
  -nomake examples ^
  -nomake tests ^
  -qpa xcb ^
  -system-zlib ^
  -plugin-sql-odbc ^
  -plugin-sql-sqlite ^
  -opengl desktop ^
  -no-sql-sqlite2 ^
  -no-strip

(configure is busy a while bootstrapping qmake)
Then mingw32-make -j8 (as suggested by configure, but with -j8 to speed up using multple cpu's)
It starts promising, but after 15 minutes the said errors appear, multiple times.
Anybody an idea? Tx.

[DanRechtsaf]

Found it: the root directory (path name) I placed the entire project in is too long. Solved when placing in a shorter / simpler directory structure. Must be bug in windows and/or mingw.

[Christian Ehrlicher]

It's the windows path limiting to 260 characters.