Re: How to check if kernel sources are installed on a system?

[Valdis . Kletnieks]

On Sun, 28 May 2006 22:35:56 PDT, 4Front Technologies said:

> Yet one more reason to have something like kernel-config (similar to gtk-config 
> or xmms-config) where you can get the package's cflags, ldflags, other info.
> 
> for example
> 
> kernel-config --cflags should say -DUSE_REGPARM -I/lib/modules/blah/blah

The problem is that there's *hundreds* of *lines* of config data, rather than
just the half-dozen or so entries that the average pkgconfig produces, and some
of the config lines influence the actual compile parameters and some don't.

I happen to have a kernel build going - here's what the compile lines looks:

25616 pts/2    S+     0:00 /bin/sh -c set -e; ?   echo '  CC      net/ipv4/udp.o'; gcc -m32 -Wp,-MD,net/ipv4/.udp.o.d  -nostdinc -isystem /usr/lib/gcc/i386-redhat-linux/4.1.1/include -D__KERNEL__ -Iinclude  -include include/linux/autoconf.h -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Wcomment -Wendif-labels -Wshadow -Os -fno-omit-frame-pointer -fno-optimize-sibling-calls -fasynchronous-unwind-tables -pipe -msoft-float -mpreferred-stack-boundary=2  -march=i686 -mtune=pentium4 -mregparm=3 -ffreestanding -Iinclude/asm-i386/mach-default -Wdeclaration-after-statement -Wno-pointer-sign    -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(udp)"  -D"KBUILD_MODNAME=KBUILD_STR(udp)" -c -o net/ipv4/udp.o net/ipv4/udp.c;  scripts/basic/fixdep net/ipv4/.udp.o.d net/ipv4/udp.o 'gcc -m32 -Wp,-MD,net/ipv4/.udp.o.d  -nostdinc -isystem /usr/lib/gcc/i386-redhat-linux/4.1.1/include -D__KERNEL__ -Iinclude  -include include/linux/autoconf.h -Wall -Wundef -W!
 strict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Wcomment -Wendif-labels -Wshadow -Os -fno-omit-frame-pointer -fno-optimize-sibling-calls -fasynchronous-unwind-tables -pipe -msoft-float -mpreferred-stack-boundary=2  -march=i686 -mtune=pentium4 -mregparm=3 -ffreestanding -Iinclude/asm-i386/mach-default -Wdeclaration-after-statement -Wno-pointer-sign    -D"KBUILD_STR(s)=\#s" -D"KBUILD_BASENAME=KBUILD_STR(udp)"  -D"KBUILD_MODNAME=KBUILD_STR(udp)" -c -o net/ipv4/udp.o net/ipv4/udp.c' > net/ipv4/.udp.o.tmp; rm -f net/ipv4/.udp.o.d; mv -f net/ipv4/.udp.o.tmp net/ipv4/.udp.o.cmd
25617 pts/2    S+     0:00 gcc -m32 -Wp,-MD,net/ipv4/.udp.o.d -nostdinc -isystem /usr/lib/gcc/i386-redhat-linux/4.1.1/include -D__KERNEL__ -Iinclude -include include/linux/autoconf.h -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Wcomment -Wendif-labels -Wshadow -Os -fno-omit-frame-pointer -fno-optimize-sibling-calls -fasynchronous-unwind-tables -pipe -msoft-float -mpreferred-stack-boundary=2 -march=i686 -mtune=pentium4 -mregparm=3 -ffreestanding -Iinclude/asm-i386/mach-default -Wdeclaration-after-statement -Wno-pointer-sign -DKBUILD_STR(s)=#s -DKBUILD_BASENAME=KBUILD_STR(udp) -DKBUILD_MODNAME=KBUILD_STR(udp) -c -o net/ipv4/udp.o net/ipv4/udp.c
25618 pts/2    R+     0:01 /usr/libexec/gcc/i386-redhat-linux/4.1.1/cc1 -quiet -nostdinc -Iinclude -Iinclude/asm-i386/mach-default -D__KERNEL__ -DKBUILD_STR(s)=#s -DKBUILD_BASENAME=KBUILD_STR(udp) -DKBUILD_MODNAME=KBUILD_STR(udp) -isystem /usr/lib/gcc/i386-redhat-linux/4.1.1/include -include include/linux/autoconf.h -MD net/ipv4/.udp.o.d net/ipv4/udp.c -quiet -dumpbase udp.c -m32 -msoft-float -mpreferred-stack-boundary=2 -march=i686 -mtune=pentium4 -mregparm=3 -auxbase-strip net/ipv4/udp.o -Os -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -Wcomment -Wendif-labels -Wshadow -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-aliasing -fno-common -fno-omit-frame-pointer -fno-optimize-sibling-calls -fasynchronous-unwind-tables -ffreestanding -o -

The reason we have the whole kbuild thing than pkgconfig is because it's
a bit more complicated to build than what pkgconfig can easily express (for
instance, the exact parameters are different for module versus built-in,
and on some architectures it may even matter if a module is under fs/ or
drivers/, and so on....)

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