Unluckily, another problem which I have a vague feeling you figured out before. Using
L:\qt6-6.2.x\bin>bldlevel qmake.exe
Build Level Display Facility Version 6.12.675 Sep 25 2001
(C) Copyright IBM Corporation 1993-2001
Signature: @#cmake build system:0.0#@##1## 18 Jan 2025 18:18:51 ARCAOS-803C4C0::::0::@@qmake
Vendor: cmake build system
Revision: 0.00
Date/Time: 18 Jan 2025 18:18:51
Build Machine: ARCAOS-803C4C0
ASD Feature ID: 4C0
File Version: 0.0
Description: qmake
I get,
[K:\work\dooble-dry\build]make
L:/QT6-6.2.X/bin/qmake.exe -o Makefile K:/work/dooble-dry/dooble.pro
Assertion failed: _UM_LUMP_STATUS (olump) == _UMS_FREE, file U:/DEV/libc-git/src
/emx/src/lib/malloc/ialloc.c, line 116
Killed by SIGABRT
pid=0x0911 ppid=0x0910 tid=0x0001 slot=0x00c3 pri=0x0200 mc=0x0001 ps=0x0010
L:\QT6-6.2.X\BIN\QMAKE.EXE
Creating 0911_01.TRP
Moved 0911_01.TRP to W:\var\log\app\68169e12-0911_01-QMAKE-exceptq.txt
make: *** [Makefile:515: Makefile] Abort trap
Trp attached.
Also want to test changing -O3 to -O2. Over optimization really made Mozilla unstable.