linux-kernel - [PATCH 6/6] fixdep: do not parse *.so, *.rmeta, *.rlib

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Date:   Sat, 31 Dec 2022 15:42:03 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Miguel Ojeda <ojeda@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>
Subject: [PATCH 6/6] fixdep: do not parse *.so, *.rmeta, *.rlib

fixdep is designed only for parsing text files. read_file() appends
a terminating null byte ('\0') and parse_config_file() calls strstr()
to search for CONFIG options.

rustc outputs *.so, *.rmeta, *rlib to dep-info. fixdep needs them in
the dependency, but there is no point to parse such binary files.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 scripts/basic/fixdep.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
index cc8f6d34c2ca..b70885116ed2 100644
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -250,6 +250,15 @@ static int is_ignored_file(const char *s, int len)
 	       str_ends_with(s, len, "include/generated/autoksyms.h");
 }
 
+/* Do not parse these files */
+static int is_no_parse_file(const char *s, int len)
+{
+	/* rustc may output binary files into dep-info */
+	return str_ends_with(s, len, ".rlib") ||
+	       str_ends_with(s, len, ".rmeta") ||
+	       str_ends_with(s, len, ".so");
+}
+
 /*
  * Important: The below generated source_foo.o and deps_foo.o variable
  * assignments are parsed not only by make, but also by the rather simple
@@ -378,7 +387,7 @@ static void parse_dep_file(char *p, const char *target)
 			need_parse = true;
 		}
 
-		if (need_parse) {
+		if (need_parse && !is_no_parse_file(p, q - p)) {
 			void *buf;
 
 			buf = read_file(p);
-- 
2.34.1