Flags for compiling a kernel

[fmalabre]

Hi,

How to set up the flag for compiling my kernel?
I set up the CFLAG variable, and it's also in my make.conf file, but when I do my make bzImage, it doens't use my flags...
Where my flags should go?

Thanks,
Fred.

[klieber]

1. What does your make.conf look like (just the relevant CHOST/CFLAGS/CXXFLAGS section)
2. What makes you think the kernel isn't being compiled with your flags?
3. Have you selected the proper CPU architecture in your kernel config when you were doing 'make menuconfig'?
   

--kurt
_________________
The problem with political jokes is that they get elected

[fmalabre]

in my make.comf file, I have:
CHOST="i686-pc-linux-gnu"
CFLAGS="-march=i686 -O3 -pipe -fforce-addr -fomit-frame-pointer -funroll-loops -frerun-loop-opt -frerun-cse-after-loop -malign-functions=4"
CXXFLAGS="-march=i686 -O3 -pipe -fforce-addr -fomit-frame-pointer -funroll-loops -frerun-loop-opt -frerun-cse-after-loop -malign-functions=4"

When I do make make bzImage, I have:
earth linux # make bzImage
. scripts/mkversion > .tmpversion
gcc -D__KERNEL__ -I/usr/src/linux-2.4.18/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fomit-frame-pointer -fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 -march=i686 -DUTS_MACHINE='"i386"' -DKBUILD_BASENAME=version -c -o init/version.o init/version.c
make CFLAGS="-D__KERNEL__ -I/usr/src/linux-2.4.18/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fomit-frame-pointer -fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 -march=i686 " -C kernel
make[1]: Entering directory `/usr/src/linux-2.4.18/kernel'
make all_targets
make[2]: Entering directory `/usr/src/linux-2.4.18/kernel'
gcc -D__KERNEL__ -I/usr/src/linux-2.4.18/include -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fomit-frame-pointer -fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 -march=i686 -DKBUILD_BASENAME=resource -c -o resource.o resource.c

As you can see, it use -O2 and I specified -O3.
I selected the proper CPU arch in my kernel config.

I checked the make file for the kernel (I have the vanilla 2.4.1, and actually I see hard coded the flag its' using.
Haven't found a way to make it use my own flag.
I just wonder if someone ever compile a kernel with its own flags, and how?

Thanks for your help,
Fred.