Makefile

12 Dec 2019

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Makefile

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A. Tips and errors when using makefile

Every shell based command are only valid in current line. Since each shell command in makefile will call a sub shell. For example, cd command will only change the path once in this line. So if you do want to use cd in makefile you have to combine other command with && or ;. Like following

cd /lib && tar -xvf xxxx.tar or cd /lib; tar -xvf xxxx.tar

A.2. Bash tips: Colors and formatting

background color:40—-49
40:black
41:dark red
42:green
43:yellow
44:blue
45:purple
46:dark green
47:white

words color:30———–39
30:black
31:red
32:green
33:yellow
34:blue
35:purple
36:dark green
37:white

===============================================ANSI control code
\33[0m default
\33[1m enable highlight
\33[4m underline
\33[5m blink
\33[7m reverse
\33[8m blanking
\33[30m – \33[37m set front color
\33[40m – \33[47m set background color
\33[nA cursor move up n row
\33[nB cursor move down n row
\33[nC cursor move right n row
\33[nD cursor move left n row
\33[y;xH set cursor position
\33[2J clear screen
\33[K clear contents after cursor
\33[s save cursor position
\33[u reset cursor position
\33[?25l hide cursor
\33[?25h show cursor

example 1:

echo -e "\033[41;36m hello world \033[0m"

example 2:

CR_GREEN=\033[1;32m
CR_RESET=\033[0m
TARGET = main
@echo "The executable files $(CR_GREEN)$(TARGET)$(CR_RESET) are in $(BUILD_DIR)"

A.3. Pattern-specific Variable

One way to make multi targets is using pattern-specific Variable:
For example, we want to generate multi targets which have the same name with source code. If we have TARGETS = app1 app2 app3, and SOURCE = app1.c app2.c app3.c.
Then $(TARGETS):%:%.c means:

app1:app1.c
app2:app2.c
test:test.c

The complete is shown in following lines:

SOURCE = $(wildcard *.c)
TARGETS = $(patsubst %.c, %, $(SOURCE))
 
CC = gcc
CFLAGS = -Wall -g
 
all:$(TARGETS)
 
$(TARGETS):%:%.c
    $(CC) $< $(CFLAGS) -o $@

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Makefile