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Diffstat (limited to 'Documentation/kbuild/makefiles.txt')
| -rw-r--r-- | Documentation/kbuild/makefiles.txt | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt index 31bfcbf958f..8abd041b605 100644 --- a/Documentation/kbuild/makefiles.txt +++ b/Documentation/kbuild/makefiles.txt @@ -285,12 +285,12 @@ more details, with real examples. --- 3.7 Compilation flags ccflags-y, asflags-y and ldflags-y - The three flags listed above apply only to the kbuild makefile where - they are assigned (i.e., per-directory). They are used for all the - normal cc, as and ld invocation happening during a recursive build. + These three flags apply only to the kbuild makefile in which they + are assigned. They are used for all the normal cc, as and ld + invocations happening during a recursive build. Note: Flags with the same behaviour were previously named: - EXTRA_CFLAGS, EXTRA_AFLAGS and EXTRA_LDFLAGS. They are still - supported but their use is deprecated. + EXTRA_CFLAGS, EXTRA_AFLAGS and EXTRA_LDFLAGS. + They are still supported but their usage is deprecated. ccflags-y specifies options for compiling with $(CC). @@ -317,10 +317,10 @@ more details, with real examples. subdir-ccflags-y, subdir-asflags-y The two flags listed above are similar to ccflags-y and asflags-y. - The difference is that the subdir- variants affect the kbuild - file where they are present and all subdirectories. Options specified - using subdir-* are added to the commandline before the options - specified using the non-subdir variants. + The difference is that the subdir- variants have effect for the kbuild + file where they are present and all subdirectories. + Options specified using subdir-* are added to the commandline before + the options specified using the non-subdir variants. Example: subdir-ccflags-y := -Werror @@ -1174,14 +1174,14 @@ When kbuild executes, the following steps are followed (roughly): === 7 Kbuild syntax for exported headers The kernel include a set of headers that is exported to userspace. -Many headers can be exported as-is but other headers requires a +Many headers can be exported as-is but other headers require a minimal pre-processing before they are ready for user-space. The pre-processing does: - drop kernel specific annotations - drop include of compiler.h -- drop all sections that is kernel internat (guarded by ifdef __KERNEL__) +- drop all sections that are kernel internal (guarded by ifdef __KERNEL__) -Each relevant directory contain a file name "Kbuild" which specify the +Each relevant directory contains a file name "Kbuild" which specifies the headers to be exported. See subsequent chapter for the syntax of the Kbuild file. |