I've tried using Openwrt toolchain itself as External toolchain by the following procedure:- # Compile and Install the toolchain in a different path make tools/install; make toolchain/install TOOLCHAIN_DIR="/opt/sw_toolchains/toolchain-mips_r2_gcc-4.7-linaro_uClibc-0.9.33.2"
Used above path by setting the following macros:- CONFIG_TARGET_OPTIMIZATION="-Os -pipe -mips32r2 -mtune=mips32r2 -funit-at-a-time -fno-caller-saves" CONFIG_SOFT_FLOAT=y CONFIG_EXTERNAL_TOOLCHAIN=y # CONFIG_NATIVE_TOOLCHAIN is not set CONFIG_TARGET_NAME="mips-openwrt-linux-uclibc" CONFIG_TOOLCHAIN_PREFIX="mips-openwrt-linux-uclibc-" CONFIG_TOOLCHAIN_ROOT="/opt/sw_toolchains/toolchain-mips_r2_gcc-4.7-linaro_uClibc-0.9.33.2" CONFIG_TOOLCHAIN_BIN_PATH="./usr/bin ./bin" CONFIG_TOOLCHAIN_INC_PATH="./usr/include ./include" CONFIG_TOOLCHAIN_LIB_PATH="./usr/lib ./lib" Above method works well. But, I have trouble with setting honour-copts. As per rules.mk and include/kernel.mk, if we set an external toolchain, the buildsystem will not pass honour-copts to userspace packages as well as kernel packages. But what if we use openwrt toolchain itself as external toolchain? How we can set fhonour copts? One way is to pass on CONFIG_TARGET_OPTIMIZATION like:- CONFIG_TARGET_OPTIMIZATION="-Os -pipe -mips32r2 -mtune=mips32r2 -funit-at-a-time -fno-caller-saves -fhonour-copts" In this case, it works for userspace apps compilation. But not on kernel compilation. And I cannot use the same config file if the toolchain is built from scratch. Because the buildsystem will again add honour-copts and it will be a added twice. Is there a way to add additional config option on external toolchain like: Use Openwrt toolchain = y ? So that we export honour-copts as default? In this case even we can avoid configuring toolchain prefix, libpath, include path etc. and keep only toolchain root as configurable field.
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