LOCNNIL commented on issue #176:
URL:
https://github.com/apache/logging-log4cxx/issues/176#issuecomment-1381739897
Currenty to find the libraries and compile the code I'm using the Cmake file
`toolchain-arm-linux-gnueabi.cmake` that points to my toolchain.
This is my toolchain file:
```cmake
set(CMAKE_SYSTEM_PROCESSOR arm)
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_VERSION 1)
set(cpu_flags "-march=armv7-a -mfloat-abi=softfp -mfpu=neon")
set(c_cxx_flags " -O2 -fexpensive-optimizations -frename-registers
-fomit-frame-pointer -pthread")
set(CMAKE_C_COMPILER /usr/bin/arm-linux-gnueabi-gcc ${cpu_flags})
set(CMAKE_CXX_COMPILER /usr/bin/arm-linux-gnueabi-g++ ${cpu_flags})
set (CMAKE_SHARED_LINKER_FLAGS "-Wl,-start-group -lpthread -lm
-Wl,-end-group -Wl,--rpath=${target_dir}/lib
-Wl,--dynamic-linker=${target_dir}/lib/ld-linux.so.3 -Wl,-O3
-Wl,--hash-style=gnu -Wl,--as-needed")
set(CMAKE_C_FLAGS ${c_cxx_flags})
set(CMAKE_CXX_FLAGS ${c_cxx_flags})
set(CMAKE_STRIP /usr/bin/arm-linux-gnueabi-strip)
set(CMAKE_FIND_ROOT_PATH /usr/arm-linux-gnueabi)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
```
I realized that my toolchain file was missing the specification `-pthread`
to tell the compiler that I'm going to use the **thread** library. Also the
linker flag `-lpthread` but this last is only for the linker and don't map the
macros inside the library so I had to use both.
But now I'm with a **different** error. It's a linking error too saying that:
```bash
cannot find -lesmtp
```
So now I'm going to cross compile libESMTP. But first, is this library realy
necessary or just used for some feature? If so, is there an Cmake option where
I can disable it?
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