Add project files

breeze/cmake/toolchains/linux-arm32-clang.cmake

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+# linux-arm32-clang: Clang building for 32-bit ARM (armhf) Linux.
+#
+#   On 32-bit ARM hardware: a native build with the ordinary clang++.
+#   Any other Linux machine: a cross build with clang++ --target=arm-linux-gnueabihf
+#                 -- or whatever triple the installed cross g++ reports for
+#                 itself (-dumpmachine): ARM's own GCC, the one on Arch, says
+#                 arm-none-linux-gnueabihf, and Clang only finds its libraries
+#                 under that name
+#                 (needs Clang plus the GCC cross package for the target's
+#                 libstdc++/libc, or -DCMAKE_SYSROOT=...; breeze/scripts/setup.sh
+#                 installs both on apt -- clang g++-arm-linux-gnueabihf --
+#                 and, from a COPR, dnf -- see linux-arm32-gcc.cmake for
+#                 details, and for why not on pacman).
+#                 If qemu-arm is installed it is registered as the
+#                 emulator, so ctest can run the result.
+#
+# See _common.cmake (pmn_linux_toolchain) for the details and overrides.
+include("${CMAKE_CURRENT_LIST_DIR}/_common.cmake")
+
+pmn_toolchain_target("linux-arm32-clang")
+pmn_linux_toolchain(arm32 clang)