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build: add support for using prebuilt LLVM toolchain 

When the prebuilt llvm toolchain is unpacked into the source dir,
it is automatically picked up and used by the build system, and eBPF
based packages can be selected

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2021-11-04 20:04:44 +01:00
parent 10cbce3b52
commit 9f90a89655
2 changed files with 21 additions and 3 deletions
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10
include/bpf.mk
View File

@ -1,6 +1,7 @@
BPF_DEPENDS := @HAS_BPF_TOOLCHAIN
LLVM_VER:=
ifneq ($(CONFIG_BPF_TOOLCHAIN_HOST),)
ifneq ($(CONFIG_USE_LLVM_HOST),)
BPF_TOOLCHAIN_HOST_PATH:=$(call qstrip,$(CONFIG_BPF_TOOLCHAIN_HOST_PATH))
ifneq ($(BPF_TOOLCHAIN_HOST_PATH),)
BPF_PATH:=$(BPF_TOOLCHAIN_HOST_PATH)/bin:$(PATH)
@ -9,9 +10,12 @@ ifneq ($(CONFIG_BPF_TOOLCHAIN_HOST),)
endif
CLANG:=$(firstword $(shell PATH='$(BPF_PATH)' which clang clang-13 clang-12 clang-11))
LLVM_VER:=$(subst clang,,$(notdir $(CLANG)))
else
endif
ifneq ($(CONFIG_USE_LLVM_PREBUILT),)
CLANG:=$(TOPDIR)/llvm-bpf/bin/clang
endif
ifneq ($(CONFIG_USE_LLVM_BUILD),)
CLANG:=$(STAGING_DIR_HOST)/llvm-bpf/bin/clang
LLVM_VER:=
endif
LLVM_PATH:=$(dir $(CLANG))

14
toolchain/Config.in
View File

@ -41,11 +41,17 @@ menuconfig TARGET_OPTIONS
choice BPF_TOOLCHAIN
prompt "BPF toolchain" if DEVEL
default BPF_TOOLCHAIN_BUILD_LLVM if BUILDBOT
default BPF_TOOLCHAIN_PREBUILT if HAS_PREBUILT_LLVM_TOOLCHAIN
default BPF_TOOLCHAIN_NONE
config BPF_TOOLCHAIN_NONE
bool "None"
config BPF_TOOLCHAIN_PREBUILT
bool "Use prebuilt LLVM toolchain"
depends on HAS_PREBUILT_LLVM_TOOLCHAIN
select USE_LLVM_PREBUILT
config BPF_TOOLCHAIN_HOST
select USE_LLVM_HOST
bool "Use host LLVM toolchain"
@ -298,10 +304,18 @@ config GDB_PYTHON
config HAS_BPF_TOOLCHAIN
bool
config HAS_PREBUILT_LLVM_TOOLCHAIN
def_bool $(shell, [ -f llvm-bpf/.llvm-version ] && echo y || echo n)
config USE_LLVM_HOST
select HAS_BPF_TOOLCHAIN
bool
config USE_LLVM_PREBUILT
select HAS_BPF_TOOLCHAIN
default y if !DEVEL && !BUILDBOT && HAS_PREBUILT_LLVM_TOOLCHAIN
bool
config USE_LLVM_BUILD
default y if !DEVEL && BUILDBOT
select HAS_BPF_TOOLCHAIN