App crash when linked with both Qxlnt and QWebWidget

[levente-levai]

fix_expat_c_code.sh.txt
Maybe someone else might find this useful.
I use Qxlnt (many thanks for the author) with QWebWidget in my Qt app (Qt 5.15.2, to be precise). My problem was the app crashing with sigsegv (I used Linux, but I think the problem pops up on other platforms, too) when linked against libQxlnt.a. The chrash happens in the QApplication constructor in a function called XML_ParseBuffer.
After some scratching of my head and consulting the linker map it turned out that the culprit is the C code in Expat xml parser. Probably the names of the functions (starting with XML_) conflict with some functions in the QWebWidget and the linker adds these functions from libQxlnt. The solution was that I renamed all the C functions in

• xlnt/third-party/libstudxml/libstudxml/parser.cxx
• xlnt//third-party/libstudxml/libstudxml/details/expat/xmlparse.c
• xlnt/third-party/libstudxml/libstudxml/details/expat/expat.h

For convenience I attached the bash script I used to do this patching. Run it from the xlnt directory.

[j2doll]

Dear @levente-levai
Can you please test with the following code.

• https://github.com/QtExcel/Qxlnt/releases/tag/v1.5.1.2

[levente-levai]

Dear @j2doll,
Nope, same problem persists. As I wrote the issue is not so much with your code (or with expat or with QWebView) but is a linking problem. There may be better solutions than my crude patch but those will be linker-specific. I suggest you mention this somewhere among the build instructions.