Commit 0d96fb20 authored by Richard Hacker's avatar Richard Hacker Committed by Sam Ravnborg
Browse files

kbuild: Add new Kbuild variable KBUILD_EXTRA_SYMBOLS



This patch adds a new (Kbuild) Makefile variable KBUILD_EXTRA_SYMBOLS.
The space separated list of file names assigned to KBUILD_EXTRA_SYMBOLS
is used when calling scripts/mod/modpost during stage 2 of the Kbuild
process for non-kernel-tree modules.
Signed-off-by: default avatarRichard Hacker <lerichi@gmx.net>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
parent 2d04b5ae
......@@ -486,7 +486,7 @@ Module.symvers contains a list of all exported symbols from a kernel build.
Sometimes, an external module uses exported symbols from another
external module. Kbuild needs to have full knowledge on all symbols
to avoid spitting out warnings about undefined symbols.
Two solutions exist to let kbuild know all symbols of more than
Three solutions exist to let kbuild know all symbols of more than
one external module.
The method with a top-level kbuild file is recommended but may be
impractical in certain situations.
......@@ -523,6 +523,13 @@ Module.symvers contains a list of all exported symbols from a kernel build.
containing the sum of all symbols defined and not part of the
kernel.
Use make variable KBUILD_EXTRA_SYMBOLS in the Makefile
If it is impractical to copy Module.symvers from another
module, you can assign a space separated list of files to
KBUILD_EXTRA_SYMBOLS in your Makfile. These files will be
loaded by modpost during the initialisation of its symbol
tables.
=== 8. Tips & Tricks
--- 8.1 Testing for CONFIG_FOO_BAR
......
......@@ -42,6 +42,13 @@ _modpost: __modpost
include include/config/auto.conf
include scripts/Kbuild.include
ifneq ($(KBUILD_EXTMOD),)
# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
$(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
endif
include scripts/Makefile.lib
kernelsymfile := $(objtree)/Module.symvers
......@@ -69,6 +76,7 @@ modpost = scripts/mod/modpost \
$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \
$(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \
$(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \
$(if $(iKBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(EXTRA_SYMBOLS))) \
$(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
$(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \
$(if $(CONFIG_MARKERS),-K $(kernelmarkersfile)) \
......
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