Solve MSVC build warnings

[g-abilio]

Type of change

• Bug fix

Description

When compiling the project using MSVC in Qt Creator, the following warnings are displayed:

 warning C4267: 'argument': conversion from 'size_t' to 'const QtNodes::PortIndex', possible loss of data

 cl : Command line warning D9025 : overriding '/W3' with '/W4'

This PR aims to solve these warnings.

Testing

• Qt version tested:
• Existing tests still pass
• Added tests for new functionality (if applicable)

[paceholder]

Hi, thanks for this fix.

Do you know where the conflict /W3 vs /W4 comes from?

[Llcoolsouder]

Hi, thanks for this fix.

Do you know where the conflict /W3 vs /W4 comes from?

Looks like we're adding it in explicitly here:

nodeeditor/CMakeLists.txt

Line 174 in b332a64

$<$<CXX_COMPILER_ID:MSVC>:/W4 /wd4127 /EHsc /utf-8>

Might be better to remove it here instead.
Probably want to make sure we're not removing warnings entirely though—which at a glance, seems to be what this PR does.

[g-abilio]

Hi, thanks for this fix.
Do you know where the conflict /W3 vs /W4 comes from?

Looks like we're adding it in explicitly here:

nodeeditor/CMakeLists.txt

Line 174 in b332a64

$<$<CXX_COMPILER_ID:MSVC>:/W4 /wd4127 /EHsc /utf-8>

Might be better to remove it here instead. Probably want to make sure we're not removing warnings entirely though—which at a glance, seems to be what this PR does.

Thanks for the suggestion! It really does seem like a better option for solving the warnings.

Regarding removing the warnings, could you explain why solving all the override and casting warnings that were mentioned wouldn't be a good idea?

[Llcoolsouder]

Regarding removing the warnings, could you explain why solving all the override and casting warnings that were mentioned wouldn't be a good idea?

I may have left that a bit unclear.
To clarify, it's definitely a good idea to fix warnings. I only meant that we should double check that this line:

string(REGEX REPLACE "/W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")

isn't just turning off/silencing all warnings.

Looking at the code a bit closer now, I see that your regex deleting the /W flags comes just before a line that adds /W4, so I think you're good to go.

---

To close the loop on where this conflict even came from, the Cmake docs seem to indicate that /W3 is a part of the set of default flags used in MSVC in CMake <3.15

[g-abilio]

Regarding removing the warnings, could you explain why solving all the override and casting warnings that were mentioned wouldn't be a good idea?

I may have left that a bit unclear. To clarify, it's definitely a good idea to fix warnings. I only meant that we should double check that this line:

string(REGEX REPLACE "/W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")

isn't just turning off/silencing all warnings.

Looking at the code a bit closer now, I see that your regex deleting the /W flags comes just before a line that adds /W4, so I think you're good to go.

To close the loop on where this conflict even came from, the Cmake docs seem to indicate that /W3 is a part of the set of default flags used in MSVC in CMake <3.15

Great! Thanks for the help and the clarification @Llcoolsouder!