makefile中 gcc -E -D -I参数的使用

yangfeng@sbuild:~/makefile/test1$ cat test.c

#include"test.h"

#include"test1.h"

#include"test2.h"

yangfeng@sbuild:~/makefile/test1$ cat test.h 

#ifdef android

void printf_android(void)

{

printf("android\n");

}

#endif

yangfeng@sbuild:~/makefile/test1$ cat test1.h 

#ifdef android1

void printf_android1(void)

{

printf("android1\n");

}

#endif

yangfeng@sbuild:~/makefile/test1$ cat test/test2.h 

#ifdef android2

void printf_android2(void)

{

printf("android2\n");

}

#endif

yangfeng@sbuild:~/makefile/test1$ gcc -E  test.c>tt         

test.c:3: fatal error: test2.h: No such file or directory

compilation terminated.

yangfeng@sbuild:~/makefile/test1$ gcc -E  -I./test test.c>tt

yangfeng@sbuild:~/makefile/test1$ cat tt

# 1 "test.c"

# 1 ""

# 1 ""

# 1 "test.c"

# 1 "test.h" 1

# 2 "test.c" 2

# 1 "test1.h" 1

# 3 "test.c" 2

# 1 "./test/test2.h" 1

# 3 "test.c" 2

yangfeng@sbuild:~/makefile/test1$ gcc -E  -Dandroid -I./test test.c>tt     

yangfeng@sbuild:~/makefile/test1$ cat tt

# 1 "test.c"

# 1 ""

# 1 ""

# 1 "test.c"

# 1 "test.h" 1

void printf_android(void)

{

printf("android\n");

}

# 2 "test.c" 2

# 1 "test1.h" 1

# 3 "test.c" 2

# 1 "./test/test2.h" 1

# 3 "test.c" 2

yangfeng@sbuild:~/makefile/test1$ gcc -E  -Dandroid -Dandroid1 -Dandroid2 -I./test test.c>tt         

yangfeng@sbuild:~/makefile/test1$ cat tt

# 1 "test.c"

# 1 ""

# 1 ""

# 1 "test.c"

# 1 "test.h" 1

void printf_android(void)

{

printf("android\n");

}

# 2 "test.c" 2

# 1 "test1.h" 1

void printf_android1(void)

{

printf("android1\n");

}

# 3 "test.c" 2

# 1 "./test/test2.h" 1

void printf_android2(void)

{

printf("android2\n");

}

# 3 "test.c" 2