diff options
Diffstat (limited to 'Documentation/kbuild/makefiles.txt')
| -rw-r--r-- | Documentation/kbuild/makefiles.txt | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt index fcd1a98..c899192 100644 --- a/Documentation/kbuild/makefiles.txt +++ b/Documentation/kbuild/makefiles.txt @@ -320,7 +320,7 @@ more details, with real examples. subdir-ccflags-y, subdir-asflags-y The two flags listed above are similar to ccflags-y and as-falgs-y. The difference is that the subdir- variants has effect for the kbuild - file where they are present and all subdirectories. + file where tey are present and all subdirectories. Options specified using subdir-* are added to the commandline before the options specified using the non-subdir variants. @@ -930,16 +930,33 @@ 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. - 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_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 + 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: |
