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authorAndrii Nakryiko <andriin@fb.com>2020-07-30 19:42:44 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2020-08-03 16:15:40 +0200
commita278f3d8191228212c553a5d4303fa603214b717 (patch)
tree4c5ba1ba7722c3858ad4d4c90f7a1e4e01c5a5cf /tools/build
parentb5cc46cdff76cdfe2cb45ab2636d847efb1012cc (diff)
downloadlinux-a278f3d8191228212c553a5d4303fa603214b717.tar.bz2
tools, build: Propagate build failures from tools/build/Makefile.build
The '&&' command seems to have a bad effect when $(cmd_$(1)) exits with non-zero effect: the command failure is masked (despite `set -e`) and all but the first command of $(dep-cmd) is executed (successfully, as they are mostly printfs), thus overall returning 0 in the end. This means in practice that despite compilation errors, tools's build Makefile will return success. We see this very reliably with libbpf's Makefile, which doesn't get compilation error propagated properly. This in turns causes issues with selftests build, as well as bpftool and other projects that rely on building libbpf. The fix is simple: don't use &&. Given `set -e`, we don't need to chain commands with &&. The shell will exit on first failure, giving desired behavior and propagating error properly. Fixes: 275e2d95591e ("tools build: Move dependency copy into function") Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Jiri Olsa <jolsa@redhat.com> Link: https://lore.kernel.org/bpf/20200731024244.872574-1-andriin@fb.com
Diffstat (limited to 'tools/build')
-rw-r--r--tools/build/Build.include3
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/build/Build.include b/tools/build/Build.include
index 9ec01f4454f9..585486e40995 100644
--- a/tools/build/Build.include
+++ b/tools/build/Build.include
@@ -74,7 +74,8 @@ dep-cmd = $(if $(wildcard $(fixdep)),
# dependencies in the cmd file
if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)), \
@set -e; \
- $(echo-cmd) $(cmd_$(1)) && $(dep-cmd))
+ $(echo-cmd) $(cmd_$(1)); \
+ $(dep-cmd))
# if_changed - execute command if any prerequisite is newer than
# target, or command line has changed