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| author |   Masahiro Yamada <yamada.masahiro@socionext.com> | 2019-07-13 11:45:58 +0900 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2019-07-17 22:37:51 +0900 |
| commit | 5ef872636ca71d35ddc5ee5951c9272a51c74418 (patch) | |
| tree | 032a6e8f7ae16e1debeac6be605bbdb30eeb0fd8 /Documentation/kbuild | |
| parent | kconfig: fix missing choice values in auto.conf (diff) | |
| download | linux-dev-5ef872636ca71d35ddc5ee5951c9272a51c74418.tar.xz linux-dev-5ef872636ca71d35ddc5ee5951c9272a51c74418.zip | |
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>
Diffstat (limited to 'Documentation/kbuild')
| -rw-r--r-- | Documentation/kbuild/kbuild.rst | 5 | ||||
| -rw-r--r-- | Documentation/kbuild/makefiles.rst | 12 |
2 files changed, 8 insertions, 9 deletions
diff --git a/Documentation/kbuild/kbuild.rst b/Documentation/kbuild/kbuild.rst index b25548963d70..727520b3d7b1 100644 --- 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 093f2d79ab95..67e47589d9d2 100644 --- 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). |