如何为内核模块makefile添加包含路径

How do I add an include path for kernel module makefile? I want to include "test_kernel.h" in test_module.c. the "test_kernel.h" resides in other directory "inc" I tried in the following solution in my Makefile but it does not work:

如何为内核模块makefile添加包含路径?我想在test_module.c中包含“test_kernel.h”。 “test_kernel.h”驻留在其他目录“inc”中我在Makefile中的以下解决方案中尝试但是它不起作用:

obj-m += test_module.o

test_module:
    $(MAKE) -C "$(LINUX_DIR)" -Iinc $(MAKE_OPTS) modules

3 个解决方案

#1

You should make use of EXTRA_CFLAGS in your Makefile. Try something on these lines:

您应该在Makefile中使用EXTRA_CFLAGS。尝试这些方面的东西:

obj-m += test_module.o
EXTRA_CFLAGS=-I$(PWD)/inc

test_module:
    $(MAKE) -C "$(LINUX_DIR)" $(MAKE_OPTS) modules

See section 3.7 Compilation Flags section here.
Hope this helps!

请参见此处的3.7编译标志部分。希望这可以帮助!

#2

-I is a GCC flag, not a Make flag.¹ You need to pass a variable down to your "sub" Make process; perhaps something like this:

-I是GCC标志,而不是Make标志.1你需要将一个变量传递给你的“sub”Make过程;也许是这样的:

$(MAKE) -C "$(LINUX_DIR)" CPPFLAGS="-Iinc" $(MAKE_OPTS) modules

where CPPFLAGS is a standard Make variable that's used in the implicit rules. Feel free to use your own variable instead, and ensure it's used appropriately in the sub-make.

其中CPPFLAGS是隐式规则中使用的标准Make变量。您可以随意使用自己的变量,并确保在子制作中使用它。

The Make manual gives more details on communicating variables between Make instances: http://www.gnu.org/software/make/manual/make.html#Variables_002fRecursion.

Make手册提供了有关在Make实例之间传递变量的更多详细信息:http://www.gnu.org/software/make/manual/make.html#Variables_002fRecursion。

_{1. Actually, it is also a Make flag, but for something completely unrelated.}

#3

are you sure you correctly specified the include in your file?

你确定你在文件中正确指定了include吗?

e.g.:

#include "inc/something.h"

instead of

#include <inc/something.h>

#1