Fix more emscripten compiler errors #7895
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I ran the CMake configure with:
```bash
emcmake cmake -B build-wasm -S . \
-DCMAKE_BUILD_TYPE=Release \
-DBUILD_SHARED_LIBS=OFF \
-DWITH_SIMULATION_MODULES=OFF \
-DWITH_PROTOBUF=OFF \
-DWITH_GUI=OFF \
-DWITH_CSCORE=OFF
```
* Turned off simulation modules because they require shared libraries
* Turned off GUI because glfw requires libssh
* Turned off cscore because it requires OpenCV
I still get the following compiler errors:
```
/home/tav/frc/wpilib/allwpilib/wpinet/src/main/native/thirdparty/libuv/src/unix/linux.cpp:43:10: fatal error: 'sys/epoll.h' file not found
43 | #include <sys/epoll.h>
| ^~~~~~~~~~~~~
```
```
/home/tav/frc/wpilib/allwpilib/wpinet/src/main/native/thirdparty/libuv/src/unix/stream.cpp:991:56: error: comparison of integers of different signs: 'unsigned long' and 'long' [-Werror,-Wsign-compare]
991 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) {
| ^~~~~~~~~~~~~~~~~~~~~~
/home/tav/.cache/emscripten/sysroot/include/sys/socket.h:358:44: note: expanded from macro 'CMSG_NXTHDR'
358 | __CMSG_LEN(cmsg) + sizeof(struct cmsghdr) >= __MHDR_END(mhdr) - (unsigned char *)(cmsg) \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
```
/home/tav/frc/wpilib/allwpilib/wpinet/src/main/native/thirdparty/libuv/src/unix/core.cpp:748:56: error: comparison of integers of different signs: 'unsigned long' and 'long' [-Werror,-Wsign-compare]
748 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
| ^~~~~~~~~~~~~~~~~~~~~~
/home/tav/.cache/emscripten/sysroot/include/sys/socket.h:358:44: note: expanded from macro 'CMSG_NXTHDR'
358 | __CMSG_LEN(cmsg) + sizeof(struct cmsghdr) >= __MHDR_END(mhdr) - (unsigned char *)(cmsg) \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
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PeterJohnson
approved these changes
Apr 26, 2025
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I ran the CMake configure with:
emcmake cmake -B build-wasm -S . \ -DCMAKE_BUILD_TYPE=Release \ -DBUILD_SHARED_LIBS=OFF \ -DWITH_SIMULATION_MODULES=OFF \ -DWITH_PROTOBUF=OFF \ -DWITH_GUI=OFF \ -DWITH_CSCORE=OFFI still get the following compiler errors: