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kbuild: allow assignment to {A,C,LD}FLAGS_MODULE on the command line

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It is now possible to assign options to AS, CC and LD
on the command line - which is only used when building modules.

{A,C,LD}FLAGS_MODULE was all used both in the top-level Makefile
in the arch makefiles, thus users had no way to specify
additional options to AS, CC, LD when building modules
without overriding the original value.

Introduce a new set of variables KBUILD_{A,C,LD}FLAGS_MODULE
that is used by arch specific files and free up
{A,C,LD}FLAGS_MODULE so they can be assigned on
the command line.

All arch Makefiles that used the old variables has been updated.

Note: Previously we had a MODFLAGS variable for both
AS and CC. But in favour of consistency this was dropped.
So in some cases arch Makefile has one assignmnet replaced by
two assignmnets.

Note2: MODFLAGS was not documented and is dropped
without any notice. I do not expect much/any breakage
from this.

Signed-off-by: Sam Ravnborg <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: Haavard Skinnemoen <[email protected]>
Cc: Mike Frysinger <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Chen Liqin <[email protected]>
Acked-by: Mike Frysinger <[email protected]> [blackfin]
Acked-by: Haavard Skinnemoen <[email protected]> [avr32]
Signed-off-by: Michal Marek <[email protected]>
This commit is contained in:
Sam Ravnborg 2010-07-28 17:33:09 +02:00 • committed by Michal Marek
commit 6588169d51
14 changed files with 62 additions and 27 deletions
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16
Documentation/kbuild/kbuild.txt
View file

@ -22,11 +22,23 @@ building C files and assembler files.
KAFLAGS
--------------------------------------------------
Additional options to the assembler.
Additional options to the assembler (for built-in and modules).
AFLAGS_MODULE
--------------------------------------------------
Addtional module specific options to use for $(AS).
KCFLAGS
--------------------------------------------------
Additional options to the C compiler.
Additional options to the C compiler (for built-in and modules).
CFLAGS_MODULE
--------------------------------------------------
Addtional module specific options to use for $(CC).
LDFLAGS_MODULE
--------------------------------------------------
Additional options used for $(LD) when linking modules.
KBUILD_VERBOSE
--------------------------------------------------

18
Documentation/kbuild/makefiles.txt
View file

@ -928,11 +928,23 @@ When kbuild executes, the following steps are followed (roughly):
$(CFLAGS_KERNEL) contains extra C compiler flags used to compile
resident kernel code.
CFLAGS_MODULE $(CC) options specific for modules
KBUILD_AFLAGS_MODULE Options for $(AS) when building modules
$(CFLAGS_MODULE) contains extra C compiler flags used to compile code
for loadable kernel modules.
$(KBUILD_AFLAGS_MODULE) is used to add arch specific options that
are used for $(AS).
From commandline AFLAGS_MODULE shall be used (see kbuild.txt).
KBUILD_CFLAGS_MODULE Options for $(CC) when building modules
$(KBUILD_CFLAGS_MODULE) is used to add arch specific options that
are used for $(CC).
From commandline CFLAGS_MODULE shall be used (see kbuild.txt).
KBUILD_LDFLAGS_MODULE Options for $(LD) when linking modules
$(KBUILD_LDFLAGS_MODULE) is used to add arch specific options
used when linking modules. This is often a linker script.
From commandline LDFLAGS_MODULE shall be used (see kbuild.txt).
--- 6.2 Add prerequisites to archprepare: