[openwrt/openwrt] bpf: ignore missing LLVM bins on package for non compile steps

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch openwrt-22.03:
https://git.openwrt.org/f7541aecdc0658051f492016733a64a1de4904bd

commit f7541aecdc0658051f492016733a64a1de4904bd
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Wed Jan 18 12:22:12 2023 +0100

    bpf: ignore missing LLVM bins on package for non compile steps
    
    To download a package the LLVM bins are not strictly needed.
    Currently with an example run of make package/bridger/download V=s, the
    build fail with
    
    make[2]: Entering directory '/home/ansuel/openwrt-ansuel/openwrt/package/network/services/bridger'
    bash: line 1: /home/ansuel/openwrt-ansuel/openwrt/staging_dir/host/llvm-bpf/bin/clang: No such file or directory
    bash: line 1: [: : integer expression expected
    /home/ansuel/openwrt-ansuel/openwrt/include/bpf.mk:71: *** ERROR: LLVM/clang version too old. Minimum required: 12, found: .  Stop.
    make[2]: Leaving directory '/home/ansuel/openwrt-ansuel/openwrt/package/network/services/bridger'
    time: package/network/services/bridger/download#0.04#0.00#0.06
        ERROR: package/network/services/bridger failed to build.
    
    This is wrong since it may be needed to download the required packages
    first and then compile them later.
    
    Fix this by ignoring the LLVM bin check on non compile steps.
    
    Tested-by: Robert Marko <robimarko at gmail.com>
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
    (cherry picked from commit 116c73fd71c75e38c4d707dc5a74e6993874098f)
---
 include/bpf.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/bpf.mk b/include/bpf.mk
index e43fcad50c..ec3f04e1e9 100644
--- a/include/bpf.mk
+++ b/include/bpf.mk
@@ -64,7 +64,7 @@ BPF_CFLAGS := \
 	-O2 -emit-llvm -Xclang -disable-llvm-passes
 
 ifneq ($(CONFIG_HAS_BPF_TOOLCHAIN),)
-ifeq ($(DUMP),)
+ifeq ($(DUMP)$(filter download refresh,$(MAKECMDGOALS)),)
   CLANG_VER:=$(shell $(CLANG) -dM -E - < /dev/null | grep __clang_major__ | cut -d' ' -f3)
   CLANG_VER_VALID:=$(shell [ "$(CLANG_VER)" -ge "$(CLANG_MIN_VER)" ] && echo 1 )
   ifeq ($(CLANG_VER_VALID),)