From 900b4df347bbac4874149a226143a556909faba8 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 26 Feb 2021 11:32:30 +0100 Subject: 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 Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Acked-by: Josh Poimboeuf Link: https://lkml.kernel.org/r/20210226110004.252553847@infradead.org --- tools/objtool/builtin-check.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'tools/objtool') 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 #include +#include #include #include @@ -26,6 +27,11 @@ static const char * const check_usage[] = { NULL, }; +static const char * const env_usage[] = { + "OBJTOOL_ARGS=\"\"", + 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); -- cgit v1.2.3