You may omit the variable assignment operator if you prefer. If omitted, make assumes it to be ‘=’ and creates a recursively-expanded variable. When using a ‘+=’ operator, the value is appended to the previ
如果<variable>;是一个环境变量,并且当Makefile被执行时,“-e”参数没有被打开。 “file” 如果<variable>;这个变量被定义在Makefile中。 “command line” 如果<variable>;这个变量是被命令行定义的。 “override” 如果<variable>;是被override指示符重新定义的。 “automatic” 如果<variable>;是一个命令运行中...
The main job of the configure script is to create a Makefile. This is a very important file for the installation process. Depending on the results of the tests (checks) that the configure script performed it would write down the various steps that need to be taken (while compiling the sof...
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...
.u-boot.bin.cmd里面定义了一个变量:cmd_u-boot.bin,此变量的值为“cp u-boot-dtb.bin u-boot.bin”,也就是拷贝一份u-boot-dtb.bin文件,并且重命名为u-boot.bin,这个就是u-boot.bin的来源,来自于文件u-boot-dtb.bin。 u-boot-dtb.bin是怎么来的呢?文件.u-boot-dtb.bin.cmd就是用于生成u-boot...
The makefile allows you to use macros, which are similar to variables and used as same as C macros. For example: CC = gcc CFLAGS = -O -Wall LDFLAGS = LIBS = -lmcpp -lm -lopenssl OBJECTS = main.c function.c Here, CC is variable or macro which assign value gcc and same as othe...
Simply expanded (using:=) allows you to append to a variable. Recursive definitions will give an infinite loop error. one = hello# one gets defined as a simply expanded variable (:=) and thus can handle appendingone := ${one} thereall:echo$(one) ...
After Build.exe locates the dirs and sources files, it sets an internal environment variable. Nmake.exe uses this variable to append the Sources.cmn file to sources files in applicable subdirectories. For information about Sources.cmn, see Sources File. Using the linking rules contained in Make...
export VARIABLE …… //导出变量给子make 。 unexport VARIABLE…… //不导出变量给子make。 有两个特殊的变量:“SHELL”和“MAKEFLAGS”,这两个变量除非使用“unexport”声明,否则的话在整个make的执行过程中,它们的值始终自动的传递给子make。在uboot的主Makefile中有如下代码: ...
# To change the values of 'make' variables: instead of editing Makefiles, # (1) if the variable is set in 'config.status', edit 'config.status' # (which will cause the Makefiles to be regenerated when you run 'make'); # (2) otherwise, pass the desired values on the 'make...