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kbuild: drop shared library support from Makefile.host

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The shared library feature in Makefile.host is no longer used.
Rip it off to keep the build infrastucture simple.

Update Documentation/kbuild/makefiles.txt too.
The section "4.3 Definition shared libraries" should be removed
and the following sections should be re-numbered.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Suggested-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>
This commit is contained in:
Masahiro Yamada
2014-07-16 16:12:21 +09:00
committed by Michal Marek
parent edb950c17d
commit 62e2210798
2 changed files with 11 additions and 71 deletions
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Documentation/kbuild/makefiles.txt
+8 -31
View File
@@ -23,11 +23,10 @@ This document describes the Linux kernel Makefiles.
=== 4 Host Program support
--- 4.1 Simple Host Program
--- 4.2 Composite Host Programs
--- 4.3 Defining shared libraries
--- 4.4 Using C++ for host programs
--- 4.5 Controlling compiler options for host programs
--- 4.6 When host programs are actually built
--- 4.7 Using hostprogs-$(CONFIG_FOO)
--- 4.3 Using C++ for host programs
--- 4.4 Controlling compiler options for host programs
--- 4.5 When host programs are actually built
--- 4.6 Using hostprogs-$(CONFIG_FOO)
=== 5 Kbuild clean infrastructure
@@ -643,29 +642,7 @@ Both possibilities are described in the following.
Finally, the two .o files are linked to the executable, lxdialog.
Note: The syntax <executable>-y is not permitted for host-programs.
--- 4.3 Defining shared libraries
Objects with extension .so are considered shared libraries, and
will be compiled as position independent objects.
Kbuild provides support for shared libraries, but the usage
shall be restricted.
In the following example the libkconfig.so shared library is used
to link the executable conf.
Example:
#scripts/kconfig/Makefile
hostprogs-y := conf
conf-objs := conf.o libkconfig.so
libkconfig-objs := expr.o type.o
Shared libraries always require a corresponding -objs line, and
in the example above the shared library libkconfig is composed by
the two objects expr.o and type.o.
expr.o and type.o will be built as position independent code and
linked as a shared library libkconfig.so. C++ is not supported for
shared libraries.
--- 4.4 Using C++ for host programs
--- 4.3 Using C++ for host programs
kbuild offers support for host programs written in C++. This was
introduced solely to support kconfig, and is not recommended
@@ -688,7 +665,7 @@ Both possibilities are described in the following.
qconf-cxxobjs := qconf.o
qconf-objs := check.o
--- 4.5 Controlling compiler options for host programs
--- 4.4 Controlling compiler options for host programs
When compiling host programs, it is possible to set specific flags.
The programs will always be compiled utilising $(HOSTCC) passed
@@ -716,7 +693,7 @@ Both possibilities are described in the following.
When linking qconf, it will be passed the extra option
"-L$(QTDIR)/lib".
--- 4.6 When host programs are actually built
--- 4.5 When host programs are actually built
Kbuild will only build host-programs when they are referenced
as a prerequisite.
@@ -747,7 +724,7 @@ Both possibilities are described in the following.
This will tell kbuild to build lxdialog even if not referenced in
any rule.
--- 4.7 Using hostprogs-$(CONFIG_FOO)
--- 4.6 Using hostprogs-$(CONFIG_FOO)
A typical pattern in a Kbuild file looks like this: