From a6ac8b5a4da379d959bfccba255db65b0da0c821 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Thu, 13 Jan 2022 15:33:46 +0900
Subject: [PATCH] meson: check if clang supports bpf

---
 meson.build | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index a0ce462f317..073667ef6c9 100644
--- a/meson.build
+++ b/meson.build
@@ -995,6 +995,14 @@ else
                 clang_bin = 'clang'
         endif
         clang = find_program(clang_bin, required : bpf_framework_required)
+
+        if clang.found()
+                # Check if 'clang -target bpf' is supported.
+                clang_supports_bpf = run_command(clang, '-target', 'bpf', '--print-supported-cpus', check : false).returncode() == 0
+        else
+                clang_supports_bpf = false
+        endif
+
         if not meson.is_cross_build() and clang.found()
                 llvm_strip_bin = run_command(clang, '--print-prog-name', 'llvm-strip',
                                              check : true).stdout().strip()
@@ -1011,7 +1019,7 @@ else
                                required : bpf_framework_required,
                                version : '>= 5.6')
 
-        deps_found = libbpf.found() and clang.found() and llvm_strip.found() and bpftool.found()
+        deps_found = libbpf.found() and clang.found() and clang_supports_bpf and llvm_strip.found() and bpftool.found()
         # Can build BPF program from source code in restricted C
         conf.set10('BPF_FRAMEWORK', deps_found)
 endif