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Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 5.10
Affects Version/s: 5.10.0
Component/s: Build System, Build tools: qmake
Labels:
None
Environment:

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Windows 10 Pro for Workstations x64 - 10.0.16299.98
Intel Core i5 3570
RAM 16 GB DDR3
240GB SSD

QtCreator 4.5.0
Qt 5.10.0 msvc2017 x64

Visual Studio 2017 15.5.1
Microsoft (R) C/C++ Optimizing Compiler Version 19.12.25830.2 for x64

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Windows 10 Pro for Workstations x64 - 10.0.16299.98 Intel Core i5 3570 RAM 16 GB DDR3 240GB SSD QtCreator 4.5.0 Qt 5.10.0 msvc2017 x64 Visual Studio 2017 15.5.1 Microsoft (R) C/C++ Optimizing Compiler Version 19.12.25830.2 for x64

Declaring an header as a precompiled one causes qnamespace.h and qobjectdefs.h to raise a ton of errors when compiling the project.

It worked as intended on Qt 5.9.3 and previous versions.

is duplicated by

QTBUG-65850 qmake generated Makefile with precompiled header compiles as c instead of c++ on MSVC