1.关于GCC版本导致的差异--宏 -D

1.前言

GCC版本的差异.

root@ubuntu: gcc -v
    gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)

root@ubuntu: arm-linux-gcc -v
    gcc version 4.3.2 (Sourcery G++ Lite 2008q3-72)

root@ubuntu: arm-linux-gnueabihf-gcc -v
    gcc version 4.8.3 20140106 (prerelease) (crosstool-NG linaro-1.13.1-4.8-2014.01 - Linaro GCC 2013.11)

2.脚本

下面是一个Makefile脚本一段(定义VERSION),Makefile 写法跟shell有所差别：

$(CC) -DVERSION=\""$(shell cat version)"\" -o $@ $<

3.编译错误

1.使用gcc 编译：

root@ubuntu:# make
gcc  -DVERSION=\""(x86 Xinu) #51 (root@ubuntu) Mon Jun 20 21:15:05 CST 2016"\" -o main main.c

2.使用arm-linux-gcc编译：

root@ubuntu:# make
arm-linux-gcc  -DVERSION=\""(x86 Xinu) #52 (root@ubuntu) Mon Jun 20 21:16:51 CST 2016"\" -o main main.c
arm-none-linux-gnueabi-gcc: Xinu): No such file or directory
arm-none-linux-gnueabi-gcc: #52: No such file or directory
arm-none-linux-gnueabi-gcc: (root@ubuntu): No such file or directory
arm-none-linux-gnueabi-gcc: Mon: No such file or directory
arm-none-linux-gnueabi-gcc: Jun: No such file or directory
arm-none-linux-gnueabi-gcc: 20: No such file or directory
arm-none-linux-gnueabi-gcc: 21:16:51: No such file or directory
arm-none-linux-gnueabi-gcc: CST: No such file or directory
arm-none-linux-gnueabi-gcc: 2016": No such file or directory
: warning: missing terminating " character
main.c: In function 'main':
main.c:7: error: missing terminating " character
main.c:7: error: expected expression before ')' token
make: *** [main] Error 1

3.使用arm-linux-gnueabihf-gcc编译：

root@ubuntu:# make
    arm-linux-gnueabihf-gcc -DVERSION=\""(x86 Xinu) #53 (root@ubuntu) Mon Jun 20 21:20:57 CST 2016"\" -o main main.c

PS:我们时常碰到这种编译器版本的问题(可以说是BUG吧)而摸不着头脑,很多时候就是这种情况。

4.执行结果

root@ubuntu:# ./main
    Version : (x86 Xinu) #54 (root@ubuntu) Mon Jun 20 21:26:33 CST 2016

5.附录

1.Makefile

#
# Make the Xinu configuration program
#

VERSION_FILE = version.h

CC = arm-linux-gnueabihf-gcc  #gcc  #arm-linux-gcc

all : main

VERSIONS : 
    $(shell cat define VERSION 	\""`cat version`"\"  > $(VERSION_FILE))

main :  main.c
    $(shell ./mkvers.sh)
    $(CC) -DVERSION=\""$(shell cat version)"\" -o $@ $<


clean : 
    rm -fr main *.bak version $(VERSION_FILE)

2.main.c

#include 

int main ()
{
    printf("Version : %s\n\r",VERSION);
}

3.mkvers.sh

if [ -f vn ]; then
    expr `cat vn` + 1 > vn
else
    echo 0 > vn
fi
if [ -z "$USER" ]; then
       USER=`whoami`
fi
HOST=`hostname`
VN=`cat vn`
echo  "(x86 Xinu) #$VN ("$USER"@"$HOST") "`date` > version