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build: add support for using prebuilt LLVM toolchain

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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