gcc-3.4编译strace-4.6

gcc 3.4编译strace-4.6的话，会遇到这样的错误：

block.c: In function `block_ioctl':
block.c:271: error: `BLKTRACESTOP' undeclared (first use in this function)
block.c:271: error: (Each undeclared identifier is reported only once
block.c:271: error: for each function it appears in.)
make[2]: *** [block.o] Error 1
make[2]: Leaving directory `/home/liangry/download/strace-4.6'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/liangry/download/strace-4.6'
make: *** [all] Error 2

问题不在第271行，而在于block.c前面的宏定义：

#ifndef BLKTRACESTART#define BLKTRACESTART _IO(0x12,116)#endif#ifndef BLKTRACESTART#define BLKTRACESTOP _IO(0x12,117)#endif

本意是如果没有定义BLKTRACESTART的话，定义BLKTRACESTART和BLKTRACESTOP，这是能够被gcc 4识别的，却不能够被gcc 3.4识别，所以需打上补丁：

--- block.c 2011-01-17 07:07:51.000000000 +0800+++ block.c 2011-04-27 14:11:32.000000000 +0800@@ -53,6 +53,7 @@ #endif #ifndef BLKTRACESTART #define BLKTRACESTART _IO(0x12,116)+#define BLKTRACESTOP _IO(0x12,117) #endif #ifndef BLKTRACESTART #define BLKTRACESTOP _IO(0x12,117)

在strace-4.6编译目录下，把上述内容保存为strace-4.6_gcc-3.4.patch，然后执行：

$ patch -p0 < strace-4.6_gcc-3.4.patch
patching file block.c