From mboxrd@z Thu Jan 1 00:00:00 1970 From: free.amit.kumar@gmail.com (Amit Kumar) Date: Thu, 17 Nov 2016 07:38:20 +0000 Subject: Which header file? In-Reply-To: <90356.1479339048@turing-police.cc.vt.edu> References: <90356.1479339048@turing-police.cc.vt.edu> Message-ID: To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org On Thu, Nov 17, 2016 at 5:00 AM wrote: > On Wed, 16 Nov 2016 21:01:19 +0000, Amit Kumar said: > > > In linux/include/linux/atomic.h, there are two files included > asm/atomic.h > > and asm/barrier.h. Both files are present in linux/include/asm-generic > and > > linux/arch/arm/include/asm. If I build like, > > CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm make zImage dtbs > > then which file is being used. > > Hint 1: Check for symlinks. > Hint 2: Compile with 'make V=1' which will show the complete gcc command > line, > Thank you for your hints. I have used omap2plus_defconfig. After issuing command, CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm make zImage dtbs V=1 | tee mybuild.log I have got something like this, ... -nostdinc -isystem /usr/lib/gcc-cross/arm-linux-gnueabi/5/include -I./arch/arm/include -I./arch/arm/include/generated/uapi -I./arch/arm/include/generated -I./include -I./arch/arm/include/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h ... First all -I is searched sequentially then -isystem dir is searched. One additional thing I found that every file includes ./include/linux/kconfig.h which in turn includes generated/kconfig.h, which I think is generated on the basis of .config, to check features enabled. so you can see the order of -I parameters. > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20161117/2bb6e712/attachment.html