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Diffstat (limited to 'Documentation/kbuild/kbuild.rst')
| -rw-r--r-- | Documentation/kbuild/kbuild.rst | 44 |
1 files changed, 25 insertions, 19 deletions
diff --git a/Documentation/kbuild/kbuild.rst b/Documentation/kbuild/kbuild.rst index 61b2181ed3ea..ef19b9c13523 100644 --- a/Documentation/kbuild/kbuild.rst +++ b/Documentation/kbuild/kbuild.rst @@ -77,6 +77,17 @@ HOSTLDLIBS ---------- Additional libraries to link against when building host programs. +.. _userkbuildflags: + +USERCFLAGS +---------- +Additional options used for $(CC) when compiling userprogs. + +USERLDFLAGS +----------- +Additional options used for $(LD) when linking userprogs. userprogs are linked +with CC, so $(USERLDFLAGS) should include "-Wl," prefix as applicable. + KBUILD_KCONFIG -------------- Set the top-level Kconfig file to the value of this environment @@ -105,6 +116,15 @@ The output directory can also be specified using "O=...". Setting "O=..." takes precedence over KBUILD_OUTPUT. +KBUILD_EXTRA_WARN +----------------- +Specify the extra build checks. The same value can be assigned by passing +W=... from the command line. + +See `make help` for the list of the supported values. + +Setting "W=..." takes precedence over KBUILD_EXTRA_WARN. + KBUILD_DEBARCH -------------- For the deb-pkg target, allows overriding the normal heuristics deployed by @@ -228,7 +248,7 @@ This is solely useful to speed up test compiles. KBUILD_EXTRA_SYMBOLS -------------------- For modules that use symbols from other modules. -See more details in modules.txt. +See more details in modules.rst. ALLSOURCE_ARCHS --------------- @@ -241,11 +261,6 @@ To get all available archs you can also specify all. E.g.:: $ make ALLSOURCE_ARCHS=all tags -KBUILD_ENABLE_EXTRA_GCC_CHECKS ------------------------------- -If enabled over the make command line with "W=1", it turns on additional -gcc -W... options for more extensive build-time checking. - KBUILD_BUILD_TIMESTAMP ---------------------- Setting this to a date string overrides the timestamp used in the @@ -259,16 +274,7 @@ These two variables allow to override the user@host string displayed during boot and in /proc/version. The default value is the output of the commands whoami and host, respectively. -KBUILD_LDS ----------- -The linker script with full path. Assigned by the top-level Makefile. - -KBUILD_VMLINUX_OBJS -------------------- -All object files for vmlinux. They are linked to vmlinux in the same -order as listed in KBUILD_VMLINUX_OBJS. - -KBUILD_VMLINUX_LIBS -------------------- -All .a "lib" files for vmlinux. KBUILD_VMLINUX_OBJS and KBUILD_VMLINUX_LIBS -together specify all the object files used to link vmlinux. +LLVM +---- +If this variable is set to 1, Kbuild will use Clang and LLVM utilities instead +of GCC and GNU binutils to build the kernel. |