《朱老师物联网大讲堂》学习笔记
学习地址:www.zhulaoshi.org
# Allow for silent builds
ifeq (,$(findstring s,$(MAKEFLAGS)))
XECHO = echo
else
XECHO = :
endif
这里是关于静默编译的,
那什么是静默编译,
也就是执行脚本的时候,不去回显命令的执行,
编译时侯make -s即可,
这里-s作为MAKEFLAGS传给Makefile,
两种编译管理方法,
默认编译XX.c生成的XX.O会在同一文件夹下,这样做简单,但是会污染源文件,
如果项目涉及不同配置的版本,就无法使用这种方式来管理,
于是就出现了单独输出文件夹的方法,
即指定一个输出目录,
make O=输出目录,
或者
export BUILD DIR=输出目录,
这两种方式同时使用的话,按前一种来理解,
下面是配置代码:
#########################################################################
#
# U-boot build supports producing a object files to the separate external
# directory. Two use cases are supported:
#
# 1) Add O= to the make command line
# 'make O=/tmp/build all'
#
# 2) Set environement variable BUILD_DIR to point to the desired location
# 'export BUILD_DIR=/tmp/build'
# 'make'
#
# The second approach can also be used with a MAKEALL script
# 'export BUILD_DIR=/tmp/build'
# './MAKEALL'
#
# Command line 'O=' setting overrides BUILD_DIR environent variable.
#
# When none of the above methods is used the local build is performed and
# the object files are placed in the source directory.
#
然后我们去这么做的时候,报错了,
看readme中的介绍,
1. Add O= to the make command line invocations:
make O=/tmp/build distclean
make O=/tmp/build NAME_config
make O=/tmp/build all
不过好像还是没成功,