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authorDengke Du <dengke.du@windriver.com>2019-04-04 17:02:33 +0800
committerRichard Purdie <richard.purdie@linuxfoundation.org>2019-04-12 09:29:06 +0100
commita9ab5627774b65e713259062b983b65fa693004a (patch)
tree05ac127b69f5b0d782a3f1f98daeeeba9c5db4cc /meta
parent1576ce540baff83c0d9eb40f3cdb0166b254e1a8 (diff)
downloadpoky-a9ab5627774b65e713259062b983b65fa693004a.tar.gz
perf: workaround the error cased by maybe-uninitialized warning
When enable DEBUG_BUILD, the perf build failed by the following error: libbpf.c:727:36: error: 'data' may be used uninitialized in this function [-Werror=maybe-uninitialized] This is ok until Khem commit a patch in oe-core: 16643b03227466e2c80a24c2d079fe36e89553c1 This commit import "-Og" option to "DEBUG_OPTIMIZATION", result in this error. Actually, the warning was misinformation. We explore the code in libbpf.c: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/lib/bpf/libbpf.c#n640 -------------------------------------------------------------------------- if (scn) data = elf_getdata(scn, NULL); if (!scn || !data) { pr_warning("failed to get Elf_Data from map section %d\n", obj->efile.maps_shndx); return -EINVAL; } ...... using data... ...... -------------------------------------------------------------------------- If the 'scn' was not null, the data will be initialized. if the data was null, the function will return -EINVAL, so the data must be not null, but compiler can't see it in 'if' code block, so treat it as 'maybe-uninitialized'. (From OE-Core rev: 0eb4048bc5865579327f5a88086e3e3241b012cb) Signed-off-by: Dengke Du <dengke.du@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'meta')
-rw-r--r--meta/recipes-kernel/perf/perf.bb1
1 files changed, 1 insertions, 0 deletions
diff --git a/meta/recipes-kernel/perf/perf.bb b/meta/recipes-kernel/perf/perf.bb
index 5acdcfb9f0..546076f84b 100644
--- a/meta/recipes-kernel/perf/perf.bb
+++ b/meta/recipes-kernel/perf/perf.bb
@@ -271,3 +271,4 @@ FILES_${PN}-perl = "${libexecdir}/perf-core/scripts/perl"
271 271
272 272
273INHIBIT_PACKAGE_DEBUG_SPLIT="1" 273INHIBIT_PACKAGE_DEBUG_SPLIT="1"
274DEBUG_OPTIMIZATION_append = " -Wno-error=maybe-uninitialized"