Add ARM musl cross toolchainfile

Author: Rot127

cross_configs/linux_arm_fedora42_musl.cmake

@@ -0,0 +1,19 @@
+# This example file is for ARMv7 cross builds on Fedora 42.
+# The toolchain used is https://musl.cc/armv7m-linux-musleabi-cross.tgz
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR arm)
+set(CMAKE_C_COMPILE_OPTIONS_SYSROOT "--sysroot=")
+set(CMAKE_CXX_COMPILE_OPTIONS_SYSROOT "--sysroot=")
+
+set(TOOLCHAIN_DIR /home/user/toolchains/armv7m-linux-musleabi-cross/)
+set(CMAKE_C_COMPILER   ${TOOLCHAIN_DIR}/bin/armv7m-linux-musleabi-gcc)
+set(CMAKE_ASM_COMPILER ${TOOLCHAIN_DIR}/bin/armv7m-linux-musleabi-gcc)
+set(CMAKE_CROSS_COMPILING 1)
+
+set(CMAKE_SYSROOT /home/user/toolchains/armv7m-linux-musleabi-cross/armv7m-linux-musleabi/)
+
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+
+set(CMAKE_CROSSCOMPILING_EMULATOR qemu-arm-static;-L;${CMAKE_SYSROOT})