diff options
Diffstat (limited to 'Documentation/kbuild/makefiles.rst')
| -rw-r--r-- | Documentation/kbuild/makefiles.rst | 39 |
1 files changed, 34 insertions, 5 deletions
diff --git a/Documentation/kbuild/makefiles.rst b/Documentation/kbuild/makefiles.rst index 7964e0c245ae..8aef3650c1f3 100644 --- a/Documentation/kbuild/makefiles.rst +++ b/Documentation/kbuild/makefiles.rst @@ -291,6 +291,10 @@ Example:: # arch/x86/kernel/Makefile extra-y += vmlinux.lds +extra-y is now deprecated because this is equivalent to: + + always-$(KBUILD_BUILTIN) += vmlinux.lds + $(extra-y) should only contain targets needed for vmlinux. Kbuild skips extra-y when vmlinux is apparently not a final goal. @@ -318,9 +322,6 @@ ccflags-y, asflags-y and ldflags-y 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 usage is deprecated. ccflags-y specifies options for compiling with $(CC). @@ -449,6 +450,20 @@ $(obj) to prerequisites are referenced with $(src) (because they are not generated files). +$(srcroot) + $(srcroot) refers to the root of the source you are building, which can be + either the kernel source or the external modules source, depending on whether + KBUILD_EXTMOD is set. This can be either a relative or an absolute path, but + if KBUILD_ABS_SRCTREE=1 is set, it is always an absolute path. + +$(srctree) + $(srctree) refers to the root of the kernel source tree. When building the + kernel, this is the same as $(srcroot). + +$(objtree) + $(objtree) refers to the root of the kernel object tree. It is ``.`` when + building the kernel, but it is different when building external modules. + $(kecho) echoing information to user in a rule is often a good practice but when execution ``make -s`` one does not expect to see any output @@ -614,10 +629,10 @@ gcc-min-version Example:: - cflags-$(call gcc-min-version, 70100) := -foo + cflags-$(call gcc-min-version, 110100) := -foo In this example, cflags-y will be assigned the value -foo if $(CC) is gcc and - $(CONFIG_GCC_VERSION) is >= 7.1. + $(CONFIG_GCC_VERSION) is >= 11.1. clang-min-version clang-min-version tests if the value of $(CONFIG_CLANG_VERSION) is greater @@ -656,6 +671,20 @@ cc-cross-prefix endif endif +$(RUSTC) support functions +-------------------------- + +rustc-min-version + rustc-min-version tests if the value of $(CONFIG_RUSTC_VERSION) is greater + than or equal to the provided value and evaluates to y if so. + + Example:: + + rustflags-$(call rustc-min-version, 108500) := -Cfoo + + In this example, rustflags-y will be assigned the value -Cfoo if + $(CONFIG_RUSTC_VERSION) is >= 1.85.0. + $(LD) support functions ----------------------- |