[Buildroot] [PATCH 1/2] package/llvm: add BPF backend

[Jugurtha BELKALEM <jugurtha.belkalem@smile.fr>]

bcc is a front-end tool for eBPF :
https://github.com/iovisor/bcc/blob/master/README.md.
eBPF is the most powerful Linux tracer, and bcc
allows to write eBPF scripts in C and PYTHON3.

BCC requires enabling LLVM backend BPF support.

Signed-off-by: Jugurtha BELKALEM <jugurtha.belkalem@smile.fr>
---
 package/llvm/Config.in | 6 ++++++
 package/llvm/llvm.mk   | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/package/llvm/Config.in b/package/llvm/Config.in
index 1d21d87..6ec2ffc 100644
--- a/package/llvm/Config.in
+++ b/package/llvm/Config.in
@@ -47,6 +47,12 @@ config BR2_PACKAGE_LLVM_RTTI
 
 	  https://llvm.org/docs/HowToSetUpLLVMStyleRTTI.html
 
+config BR2_PACKAGE_LLVM_BPF
+	bool "BPF backend"
+	help
+	  Build BPF target. Select this option if you are going
+	  to install bcc on the target.
+
 endif
 
 comment "llvm needs a toolchain w/ wchar, threads, C++, gcc >= 4.8, dynamic library"
diff --git a/package/llvm/llvm.mk b/package/llvm/llvm.mk
index 24d033d..48a2981 100644
--- a/package/llvm/llvm.mk
+++ b/package/llvm/llvm.mk
@@ -61,6 +61,11 @@ ifeq ($(BR2_PACKAGE_LLVM_AMDGPU),y)
 LLVM_TARGETS_TO_BUILD += AMDGPU
 endif
 
+# Build BPF backend
+ifeq ($(BR2_PACKAGE_LLVM_BPF),y)
+LLVM_TARGETS_TO_BUILD += BPF
+endif
+
 # Use native llvm-tblgen from host-llvm (needed for cross-compilation)
 LLVM_CONF_OPTS += -DLLVM_TABLEGEN=$(HOST_DIR)/bin/llvm-tblgen
 
-- 
2.7.4