Compiler Warnings: Unused Lamba Captures

[dgovil]

Description of Issue

Clang (16 for me from Xcode 16, but will reproduce elsewhere) warns that several lambdas do not use their captured inputs.
This is potentially due to a capture difference between MSVC and Clang/GCC (see https://stackoverflow.com/questions/52416362/unused-lambda-capture-warning-when-capture-is-actually-used) but if that's the case it would be great to leave a comment , and potentially suppress the warnings.

Either way, I think it's a great first issue for someone to get to grips with building USD on Windows (where you can also get Clang) and get familiar with the codebase. I am building with python3 ./build_scripts/build_usd.py ~/Downloads/usd --build-variant debug --no-imaging -vvv.

Warnings replicated below:

[1327/4632] Building CXX object pxr/usd/sdf/CMakeFiles/sdf.dir/predicateExpression.cpp.o
/Users/dhruvgovil/Projects/usd/pxr/usd/sdf/predicateExpression.cpp:163:34: warning: lambda capture 'opStack' is not used [-Wunused-lambda-capture]
  163 |     auto printLogic = [&opName, &opStack, &result](
      |                               ~~~^~~~~~~
1 warning generated.
/Users/dhruvgovil/Projects/usd/pxr/usd/sdf/predicateExpression.cpp:163:34: warning: lambda capture 'opStack' is not used [-Wunused-lambda-capture]
  163 |     auto printLogic = [&opName, &opStack, &result](
      |                               ~~~^~~~~~~
1 warning generated.


[1349/4632] Building CXX object pxr/usd/sdf/CMakeFiles/sdf.dir/pathExpression.cpp.o
/Users/dhruvgovil/Projects/usd/pxr/usd/sdf/pathExpression.cpp:402:34: warning: lambda capture 'opStack' is not used [-Wunused-lambda-capture]
  402 |     auto printLogic = [&opName, &opStack, &result](
      |                               ~~~^~~~~~~
1 warning generated.
/Users/dhruvgovil/Projects/usd/pxr/usd/sdf/pathExpression.cpp:402:34: warning: lambda capture 'opStack' is not used [-Wunused-lambda-capture]
  402 |     auto printLogic = [&opName, &opStack, &result](
      |                               ~~~^~~~~~~
1 warning generated.

[1630/4632] Building CXX object pxr/usd/usdGeom/CMakeFiles/usdGeom.dir/basisCurves.cpp.o
/Users/dhruvgovil/Projects/usd/pxr/usd/usdGeom/basisCurves.cpp:388:45: warning: lambda capture 'vstep' is not required to be captured for this use [-Wunused-lambda-capture]
  388 |                     segmentCounts.begin(), [vstep](int n) { return n / vstep; });
      |                                             ^~~~~
/Users/dhruvgovil/Projects/usd/pxr/usd/usdGeom/basisCurves.cpp:394:45: warning: lambda capture 'vstep' is not required to be captured for this use [-Wunused-lambda-capture]
  394 |                     segmentCounts.begin(), [vstep](int n) { return (n - 4) / vstep + 1; });
      |                                             ^~~~~
2 warnings generated.
/Users/dhruvgovil/Projects/usd/pxr/usd/usdGeom/basisCurves.cpp:388:45: warning: lambda capture 'vstep' is not required to be captured for this use [-Wunused-lambda-capture]
  388 |                     segmentCounts.begin(), [vstep](int n) { return n / vstep; });
      |                                             ^~~~~
/Users/dhruvgovil/Projects/usd/pxr/usd/usdGeom/basisCurves.cpp:394:45: warning: lambda capture 'vstep' is not required to be captured for this use [-Wunused-lambda-capture]
  394 |                     segmentCounts.begin(), [vstep](int n) { return (n - 4) / vstep + 1; });
      |                                             ^~~~~
2 warnings generated.

[2749/4632] Building CXX object pxr/imaging/hdSt/CMakeFiles/hdSt.dir/commandBuffer.cpp.o
/Users/dhruvgovil/Projects/usd/pxr/imaging/hdSt/commandBuffer.cpp:529:26: warning: lambda capture 'N' is not required to be captured for this use [-Wunused-lambda-capture]
  529 |       [&visCounts, this, N](size_t start, size_t end) {
      |                        ~~^
1 warning generated.
/Users/dhruvgovil/Projects/usd/pxr/imaging/hdSt/commandBuffer.cpp:529:26: warning: lambda capture 'N' is not required to be captured for this use [-Wunused-lambda-capture]
  529 |       [&visCounts, this, N](size_t start, size_t end) {
      |                        ~~^
1 warning generated.

[3006/4632] Building CXX object pxr/imaging/hdx/CMakeFiles/hdx.dir/selectionTracker.cpp.o
/Users/dhruvgovil/Projects/usd/pxr/imaging/hdx/selectionTracker.cpp:470:22: warning: lambda capture 'N' is not required to be captured for this use [-Wunused-lambda-capture]
  470 |        [&ids, index, N, &selectedPrims](size_t begin, size_t end) mutable {
      |                    ~~^
1 warning generated.
/Users/dhruvgovil/Projects/usd/pxr/imaging/hdx/selectionTracker.cpp:470:22: warning: lambda capture 'N' is not required to be captured for this use [-Wunused-lambda-capture]
  470 |        [&ids, index, N, &selectedPrims](size_t begin, size_t end) mutable {
      |                    ~~^
1 warning generated.

[3463/4632] Building CXX object pxr/usd/usdSkel/CMakeFiles/usdSkel.dir/bakeSkinning.cpp.o
/Users/dhruvgovil/Projects/usd/pxr/usd/usdSkel/bakeSkinning.cpp:2436:29: warning: lambda capture 'parms' is not used [-Wunused-lambda-capture]
 2436 |                 [time, ti, &parms, &skinningAdapters, &bytesStoredPerLayer]
      |                          ~~~^~~~~
1 warning generated.
/Users/dhruvgovil/Projects/usd/pxr/usd/usdSkel/bakeSkinning.cpp:2436:29: warning: lambda capture 'parms' is not used [-Wunused-lambda-capture]
 2436 |                 [time, ti, &parms, &skinningAdapters, &bytesStoredPerLayer]
      |                          ~~~^~~~~
1 warning generated.

[jesschimein]

Filed as internal issue #USD-10212