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Subject[PATCH] Re: Building on platforms other than Linux
On Wed Aug 11, 2004 at 20:54:53 +0200, Sam Ravnborg wrote:
>On Wed, Aug 11, 2004 at 07:13:49PM +1000, Benno wrote:
>> Hi,
>>
>> I was wondering if there were any, in priniciple, objections
>> to making the Linux kernel buildable on different Unix-like
>> platforms?
>
>The userbase for building kernels are only increasing and there
>continue to be more focus from the embedded people.
>Having experince in this field first-hand tells me that a kernel
>that can be build on several paltforms are a good thing.

This is the direction I am coming from.

>For kbuild you will at some point start to see patches so at least
>the build system does not restrict us to Linux alone.

Great.

>People on this list usually reply: "shift development to a Linux
>based platform". This is for many developers a nice dream,
>but they are restricted by coporate rules etc.
>
>So please feed patches to this list with your findings.
>
>>
>> I am currently compiling on MacOSX and this, for the most part was
>> fairly straightforward and simple. The biggest gotcha I had was
>> that libkconfig is compiled as a shared library, and unfortunately shared
>> libraries are done quite different on different systems. Specifically MacOSX
>> doesn't support gcc -shared.
>
>Please submit a patch for this and make sure to include Roman Zippel, he
>is the maintainer of kconfig.

Attached is a patch to avoid using shared libraries in the build system.
It is very simple, instead of [m]conf linked against libkconfig.so, they
directly link against $(libkconfig-objs).

For (g|q)conf they no longer use dl_open and also directly link against
$(libkconfig-objs). (Achieved by export LKC_DIRECT_LINK to the compile.)
(Give this change one could also get rid of rules to build .so files
in Makefile.lib)

Cheers,

Benno
--- ../../../linux-2.6.7/scripts/kconfig/Makefile 2004-06-16 15:20:26.000000000 +1000
+++ Makefile 2004-08-12 09:53:15.000000000 +1000
@@ -68,8 +68,8 @@
libkconfig-objs := zconf.tab.o

host-progs := conf mconf qconf gconf
-conf-objs := conf.o libkconfig.so
-mconf-objs := mconf.o libkconfig.so
+conf-objs := conf.o $(libkconfig-objs)
+mconf-objs := mconf.o $(libkconfig-objs)

ifeq ($(MAKECMDGOALS),xconfig)
qconf-target := 1
@@ -81,11 +81,11 @@

ifeq ($(qconf-target),1)
qconf-cxxobjs := qconf.o
-qconf-objs := kconfig_load.o
+qconf-objs := $(libkconfig-objs)
endif

ifeq ($(gconf-target),1)
-gconf-objs := gconf.o kconfig_load.o
+gconf-objs := gconf.o $(libkconfig-objs)
endif

clean-files := libkconfig.so lkc_defs.h qconf.moc .tmp_qtcheck \
@@ -96,10 +96,10 @@
HOSTCFLAGS_zconf.tab.o := -I$(src)

HOSTLOADLIBES_qconf = -L$(QTLIBPATH) -Wl,-rpath,$(QTLIBPATH) -l$(QTLIB) -ldl
-HOSTCXXFLAGS_qconf.o = -I$(QTDIR)/include
+HOSTCXXFLAGS_qconf.o = -DLKC_DIRECT_LINK -I$(QTDIR)/include

HOSTLOADLIBES_gconf = `pkg-config gtk+-2.0 gmodule-2.0 libglade-2.0 --libs`
-HOSTCFLAGS_gconf.o = `pkg-config gtk+-2.0 gmodule-2.0 libglade-2.0 --cflags`
+HOSTCFLAGS_gconf.o = -DLKC_DIRECT_LINK `pkg-config gtk+-2.0 gmodule-2.0 libglade-2.0 --cflags`

$(obj)/conf.o $(obj)/mconf.o $(obj)/qconf.o $(obj)/gconf.o: $(obj)/zconf.tab.h
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