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kbuild: Add new Kbuild variable KBUILD_EXTRA_SYMBOLS

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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: Richard Hacker <[email protected]>
Signed-off-by: Sam Ravnborg <[email protected]>
This commit is contained in:
Richard Hacker 2008-02-28 09:40:58 +01:00 • committed by Sam Ravnborg
commit 0d96fb20b7
2 changed files with 16 additions and 1 deletions
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9
Documentation/kbuild/modules.txt
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@ -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