GCC 工具链自动编译脚本

本工具用于自动编译指定的工具链，可以同时生成运行于本机系统 (Build system) 和 Windows 系统(可以修改)的两套工具链

具体编译规则指定于 .config 中

defconfig 目录包含一些预定义的规则，将其复制到脚本根目录并改名为 .config 后即可编译

编译方式：

make

或

make -j

编译生成的工具链位于 output 目录中

.config 说明：

ARCH用于 Linux 内核的架构名称

TARGET工具链的 target (--target=$(TARGET))

HOST工具链的第二个运行环境 (--host=$(HOST))，需要 PATH 中存在此运行环境的工具链相关目录

VARIANT工具链的变体名(即不同优化/指令集等使用不同的名字)，没有格式要求，任意指定

PROGRAM_PREFIX工具链的程序名前缀，跟 TARGET 不同时，会创建符号链接

TARGET_GCC_FLAGS编译 GCC 时传入的额外 configure 参数

LIBC工具链使用的 C 库，可以是 glibc uclibc-ng musl newlib

LIBC_USE_SOFT_FLOATC 库是否使用软件浮点运算(即禁用 FPU)(可选值是 y 或者留空)

LIBC_DEBUGC 库是否包含调试信息(不影响优化)(可选值是 y 或者留空)

UCLIBC_VARIANTuClibc-ng 配置文件的变体，留空使用 $(TARGET).config，否则使用 $(TARGET).$(UCLIBC_VARIANT).config

TARGET_CFLAGS编译目标平台运行库的额外 CFLAGS,也应用于 CXXFLAGS

TARGET_LDFLAGS编译目标平台运行库的额外 LDFLAGS

生成的工具链位置：

运行于本机系统的工具链位于 output/$(TARGET)/$(VARIANT)/toolchain/usr

运行于第二个运行环境的工具链位于 output/$(TARGET)/$(VARIANT)/target/usr

其它说明：

如果软件包下载失败，请手动下载后放入 dl 目录

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Auto-build scripts for GCC cross-compiling toolchain

This tool is used to build specific toolchains. It can produce a toolchain running under the build system and a toolchain running under Windows (or other platforms)

The build rules are set in .config

The folder defconfig contains some pre-defined configuration files. You can copy one of them in to the build root and rename it to .config to build.

How to build:

make

or

make -j

The output toolchains are stored in the folder 'output'.

.config description:

ARCHArchitecture name used for Linux kernel compiling

TARGETTarget (GNU tirplet) for the toolchain (--target=$(TARGET))

HOSTHost (not the build system, GNU triplet) for the toolchain (--host=$(HOST)), requires pre-built toolchain for the host

VARIANTVariant name for this build (to identify the different optimization/ISA and etc.), no format requirements

PROGRAM_PREFIXProgram prefix. Will create symbolic links when it's different from TARGET

TARGET_GCC_FLAGSExtra arguments passed to the GCC configure script

LIBCThe C library used for the toolchain, valid names are glibc, uclibc-ng, musl and newlib

LIBC_USE_SOFT_FLOATWhether to use soft-float in C library ('y' for Yes, empty for No)

LIBC_DEBUGWhether to include debug symbols in C library ('y' for Yes, empty for No)

UCLIBC_VARIANTCOnfiguration variant for uClibc-ng. Leave empty to use $(TARGET).config，otherwise uses $(TARGET).$(UCLIBC_VARIANT).config

TARGET_CFLAGSExtra CFLAGS passed to target library builds (also applied to CXXFLAGS)

TARGET_LDFLAGSExtra LDFLAGS passed to target library builds

Path of generated toolchains:

Running on build system: output/$(TARGET)/$(VARIANT)/toolchain/usr

Running on $(HOST): output/$(TARGET)/$(VARIANT)/target/usr

Others:

If the source code archive is failed to download, you can download it manually and copy to the folder 'dl'.