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July 2022

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konqueror - file preview of "some" assembler not detected as plain-text
by David C. Rankin 31 Jul '22

31 Jul '22

All, This is a very strange circumstance. dumping C++ to assembler *without* optimization produces file previewed as plain-text in konqueror file preview. E.g. files created with: g++ -S -masm=intel -O0 -std=c++17 -o asm/findhyphen-0-cstr.asm findhyphen.cpp The preview for file findhyphen-0-cstr.asm is shown as plain text with proper syntax highlight in konqueror. However if you use any optimization, e.g. -O1 through -Ofast the file is recognized as "Unknown" in konqueror and previews as hex instead of plain-text. The compile string would be: g++ -S -masm=intel -O1 -std=c++17 -o asm/findhyphen-1-cstr.asm findhyphen.cpp In konqueror preview, the first line is shown in the hex preview as: 0000:0000 | 09 2E 66 69 6C 65 09 22 66 69 6E 64 68 79 70 68 | ..file."findhyph (which is all valid plain-text as is the rest of the file) All editors (including kwrite and kate) open the text as a proper plain-text assembler file with proper highlight in contrast to what konqueror preview shows. I never recall this happening before. All file utilities see nothing but plain-text as well, e.g. $ file findhyphen-1-cstr.asm findhyphen-1-cstr.asm: assembler source, ASCII text or $ head -n 5 findhyphen-1-cstr.asm .file "findhyphen.cpp" .intel_syntax noprefix .text .section .rodata.str1.1,"aMS",@progbits,1 .LC0: I can't explain any possible reason why konqueror preview choose "Unknown" type for findhyphen-1-cstr.asm and plain-text for findhyphen-0-cstr.asm, but something is wrong. I'll try attaching the text file here. -- David C. Rankin, J.D.,P.E.

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Qt3 qmake mkspec generates Makefile that calls /usr/bin/qmake instead of $(QTDIR)/bin/qmake
by David C. Rankin 16 Jul '22

16 Jul '22

All, There is a bug in default mkspec for the qmake generation of Makefile. /usr/lib/qt3/mkspecs/linux-g++-64/qmake.conf contains: QMAKE_MOC = $(QTDIR)/bin/moc QMAKE_UIC = $(QTDIR)/bin/uic Which works fine resulting in: MOC = $(QTDIR)/bin/moc UIC = $(QTDIR)/bin/uic However, for the QMAKE variable in the generated Makefile, you have: QMAKE = qmake Which causes the build to fail because it calls qmake in /usr/bin (qt4-devel qmake) instead of qt3 qmake in /usr/lib/qt3/bin. Changing the generated Makefile to: QMAKE = $(QTDIR)/bin/qmake allows qt3 builds to work fine. I'm not sure where the bug is, but it looks like the default mkspec needs to also prepend $(QTDIR)/bin to qmake to ensure qt3 qmake is called. I don't know if that can be fixed by simply modifying the default mkspec with: QMAKE_QMAKE = $(QTDIR)/bin/qmake I ran into this issue rebuilding a small personal project that provide a spinbutton and slider to set the laptop brightness from 0-20. You can reproduce the issue in 15.4 with the following minimum example: #include <qapplication.h> #include <qspinbox.h> #include <qslider.h> #include <qfont.h> #include "brightness.h" int main( int argc, char **argv ) { QApplication a( argc, argv ); form_brightness w; a.setMainWidget( &w ); w.show(); return a.exec(); } and the .ui file is: <!DOCTYPE UI><UI version="3.3" stdsetdef="1"> <class>form_brightness</class> <widget class="QWidget"> <property name="name"> <cstring>form_brightness</cstring> </property> <property name="geometry"> <rect> <x>0</x> <y>0</y> <width>239</width> <height>63</height> </rect> </property> <property name="caption"> <string>Form1</string> </property> <widget class="QSlider"> <property name="name"> <cstring>slider1</cstring> </property> <property name="geometry"> <rect> <x>10</x> <y>30</y> <width>171</width> <height>21</height> </rect> </property> <property name="focusPolicy"> <enum>StrongFocus</enum> </property> <property name="maxValue"> <number>20</number> </property> <property name="pageStep"> <number>2</number> </property> <property name="orientation"> <enum>Horizontal</enum> </property> <property name="tickmarks"> <enum>Both</enum> </property> <property name="tickInterval"> <number>2</number> </property> <property name="toolTip" stdset="0"> <string>set screen brightness</string> </property> <property name="whatsThis" stdset="0"> <string>screen brightness</string> </property> </widget> <widget class="QLabel"> <property name="name"> <cstring>textLabel1</cstring> </property> <property name="geometry"> <rect> <x>11</x> <y>0</y> <width>210</width> <height>21</height> </rect> </property> <property name="text"> <string>Screen Brightness</string> </property> </widget> <widget class="QSpinBox"> <property name="name"> <cstring>spinBox1</cstring> </property> <property name="geometry"> <rect> <x>190</x> <y>30</y> <width>30</width> <height>20</height> </rect> </property> <property name="focusPolicy"> <enum>WheelFocus</enum> </property> <property name="toolTip" stdset="0"> <string>set screen brightness</string> </property> <property name="whatsThis" stdset="0"> <string>screen brightness</string> </property> </widget> </widget> <connections> <connection> <sender>spinBox1</sender> <signal>valueChanged(int)</signal> <receiver>slider1</receiver> <slot>setValue(int)</slot> </connection> <connection> <sender>slider1</sender> <signal>valueChanged(int)</signal> <receiver>spinBox1</receiver> <slot>setValue(int)</slot> </connection> </connections> <layoutdefaults spacing="6" margin="11"/> </UI> Let me know whether this is a bug, or something that needs some other workaround (sed ?). -- David C. Rankin, J.D.,P.E.

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