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| author | Sam Ravnborg <sam@ravnborg.org> | 2010-07-28 19:11:27 +0200 |
|---|---|---|
| committer | Michal Marek <mmarek@suse.cz> | 2010-08-03 14:09:45 +0200 |
| commit | 80c00ba942ee39c9a95c06959223560400bbb86e (patch) | |
| tree | c0ff9363d1e3ab372ae8ed1137b1d012c88e683a /Documentation/kbuild/makefiles.txt | |
| parent | 6588169d516560f68672e2928680b71c647b7806 (diff) | |
| download | lwn-80c00ba942ee39c9a95c06959223560400bbb86e.tar.gz lwn-80c00ba942ee39c9a95c06959223560400bbb86e.zip | |
kbuild: allow assignment to {A,C}FLAGS_KERNEL on the command line
It is now possible to assign options to AS and CC
on the command line - which is only used for built-in code.
{A,C}FLAGS_KERNEL was used both in the top-level Makefile
in the arch makefiles, thus users had no way to specify
additional options to AS, CC without overriding
the original value.
Introduce a new set of variables KBUILD_{A,C}FLAGS_KERNEL
that is used by arch specific files and free up
{A,C}FLAGS_KERNEL so they can be assigned on
the command line.
All arch Makefiles that used the old variables has been updated.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Diffstat (limited to 'Documentation/kbuild/makefiles.txt')
| -rw-r--r-- | Documentation/kbuild/makefiles.txt | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt index 802341abf702..5c878cc6c0b4 100644 --- a/Documentation/kbuild/makefiles.txt +++ b/Documentation/kbuild/makefiles.txt @@ -923,9 +923,9 @@ When kbuild executes, the following steps are followed (roughly): The first example utilises the trick that a config option expands to 'y' when selected. - CFLAGS_KERNEL $(CC) options specific for built-in + KBUILD_AFLAGS_KERNEL $(AS) options specific for built-in - $(CFLAGS_KERNEL) contains extra C compiler flags used to compile + $(KBUILD_AFLAGS_KERNEL) contains extra C compiler flags used to compile resident kernel code. KBUILD_AFLAGS_MODULE Options for $(AS) when building modules @@ -934,6 +934,11 @@ When kbuild executes, the following steps are followed (roughly): are used for $(AS). From commandline AFLAGS_MODULE shall be used (see kbuild.txt). + KBUILD_CFLAGS_KERNEL $(CC) options specific for built-in + + $(KBUILD_CFLAGS_KERNEL) contains extra C compiler flags used to compile + resident kernel code. + KBUILD_CFLAGS_MODULE Options for $(CC) when building modules $(KBUILD_CFLAGS_MODULE) is used to add arch specific options that |