kbuild: get rid of misleading $(AS) from documents

The assembler files in the kernel are *.S instead of *.s, so they must
be preprocessed. Since 'as' of GNU binutils is not able to preprocess,
we always use $(CC) as an assembler driver.

$(AS) is almost unused in Kbuild. As of v5.2, there is just one place
that directly invokes $(AS).

  $ git grep -e '$(AS)' -e '${AS}' -e '$AS' -e '$(AS:' -e '${AS:' -- :^Documentation
  drivers/net/wan/Makefile:  AS68K = $(AS)

The documentation about *_AFLAGS* sounds like the flags were passed
to $(AS). This is somewhat misleading.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>

diff --git a/Documentation/kbuild/kbuild.rst b/Documentation/kbuild/kbuild.rst
index b25548963d70194accda66b84aa89866e2c06d2e..727520b3d7b10b627b5311370d7cd443695626d7 100644 (file)
--- a/Documentation/kbuild/kbuild.rst
+++ b/Documentation/kbuild/kbuild.rst
@@ -38,12 +38,11 @@ Additional options to the assembler (for built-in and modules).
 
 AFLAGS_MODULE
 -------------
-Additional module specific options to use for $(AS).
+Additional assembler options for modules.
 
 AFLAGS_KERNEL
 -------------
-Additional options for $(AS) when used for assembler
-code for code that is compiled as built-in.
+Additional assembler options for built-in.
 
 KCFLAGS
 -------

diff --git a/Documentation/kbuild/makefiles.rst b/Documentation/kbuild/makefiles.rst
index 093f2d79ab95d9853b8d088f8d47f5acc650ed56..67e47589d9d2c05582f7a09de010b7b094e32a35 100644 (file)
--- a/Documentation/kbuild/makefiles.rst
+++ b/Documentation/kbuild/makefiles.rst
@@ -328,7 +328,7 @@ more details, with real examples.
        variable $(KBUILD_CFLAGS) and uses it for compilation flags for the
        entire tree.
 
-       asflags-y specifies options for assembling with $(AS).
+       asflags-y specifies assembler options.
 
        Example::
 
@@ -489,7 +489,7 @@ more details, with real examples.
        as-instr checks if the assembler reports a specific instruction
        and then outputs either option1 or option2
        C escapes are supported in the test instruction
-       Note: as-instr-option uses KBUILD_AFLAGS for $(AS) options
+       Note: as-instr-option uses KBUILD_AFLAGS for assembler options
 
     cc-option
        cc-option is used to check if $(CC) supports a given option, and if
@@ -905,7 +905,7 @@ When kbuild executes, the following steps are followed (roughly):
        vmlinux. The usage of $(call if_changed,xxx) will be described later.
 
     KBUILD_AFLAGS
-       $(AS) assembler flags
+       Assembler flags
 
        Default value - see top level Makefile
        Append or modify as required per architecture.
@@ -948,16 +948,16 @@ When kbuild executes, the following steps are followed (roughly):
        to 'y' when selected.
 
     KBUILD_AFLAGS_KERNEL
-       $(AS) options specific for built-in
+       Assembler options specific for built-in
 
        $(KBUILD_AFLAGS_KERNEL) contains extra C compiler flags used to compile
        resident kernel code.
 
     KBUILD_AFLAGS_MODULE
-       Options for $(AS) when building modules
+       Assembler options specific for modules
 
        $(KBUILD_AFLAGS_MODULE) is used to add arch-specific options that
-       are used for $(AS).
+       are used for assembler.
 
        From commandline AFLAGS_MODULE shall be used (see kbuild.txt).