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authorPeter Zijlstra <peterz@infradead.org>2021-02-26 13:32:30 +0300
committerIngo Molnar <mingo@kernel.org>2021-03-06 14:44:23 +0300
commit900b4df347bbac4874149a226143a556909faba8 (patch)
tree238d47ff201a66cd923aee4c8a98ddd859261742 /tools/objtool
parenta2f605f9ff57397d05a8e2f282b78a69f574d305 (diff)
downloadlinux-900b4df347bbac4874149a226143a556909faba8.tar.xz
objtool: Parse options from OBJTOOL_ARGS
Teach objtool to parse options from the OBJTOOL_ARGS environment variable. This enables things like: $ OBJTOOL_ARGS="--backup" make O=defconfig-build/ kernel/ponies.o to obtain both defconfig-build/kernel/ponies.o{,.orig} and easily inspect what objtool actually did. Suggested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lkml.kernel.org/r/20210226110004.252553847@infradead.org
Diffstat (limited to 'tools/objtool')
-rw-r--r--tools/objtool/builtin-check.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index 03997524b93f..8b38b5d6fec7 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -15,6 +15,7 @@
#include <subcmd/parse-options.h>
#include <string.h>
+#include <stdlib.h>
#include <objtool/builtin.h>
#include <objtool/objtool.h>
@@ -26,6 +27,11 @@ static const char * const check_usage[] = {
NULL,
};
+static const char * const env_usage[] = {
+ "OBJTOOL_ARGS=\"<options>\"",
+ NULL,
+};
+
const struct option check_options[] = {
OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),
@@ -44,6 +50,25 @@ const struct option check_options[] = {
int cmd_parse_options(int argc, const char **argv, const char * const usage[])
{
+ const char *envv[16] = { };
+ char *env;
+ int envc;
+
+ env = getenv("OBJTOOL_ARGS");
+ if (env) {
+ envv[0] = "OBJTOOL_ARGS";
+ for (envc = 1; envc < ARRAY_SIZE(envv); ) {
+ envv[envc++] = env;
+ env = strchr(env, ' ');
+ if (!env)
+ break;
+ *env = '\0';
+ env++;
+ }
+
+ parse_options(envc, envv, check_options, env_usage, 0);
+ }
+
argc = parse_options(argc, argv, check_options, usage, 0);
if (argc != 1)
usage_with_options(usage, check_options);