From:   Sergey Senozhatsky <senozhatsky@chromium.org>
To:     Masahiro Yamada <masahiroy@kernel.org>
Cc:     Patrick Georgi <pgeorgi@google.com>, linux-kbuild@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Sergey Senozhatsky <senozhatsky@chromium.org>,
        Stefan Reinauer <reinauer@google.com>
Subject: [PATCH] kconfig: WERROR unmet symbol dependency
Date:   Wed, 22 Nov 2023 12:47:45 +0900
Message-ID: <20231122034753.1446513-1-senozhatsky@chromium.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

When KCONFIG_WERROR env variable is set treat unmet direct
symbol dependency as a terminal condition (error).

Suggested-by: Stefan Reinauer <reinauer@google.com>
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
---
 scripts/kconfig/symbol.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

Index: kconfig/symbol.c
===================================================================
--- kconfig.orig/symbol.c
+++ kconfig/symbol.c
@@ -37,6 +37,7 @@ static struct symbol symbol_empty = {
 
 struct symbol *modules_sym;
 static tristate modules_val;
+static int sym_warnings;
 
 enum symbol_type sym_get_type(struct symbol *sym)
 {
@@ -317,12 +318,14 @@ static void sym_warn_unmet_dep(struct sy
 			       "  Selected by [m]:\n");
 
 	fputs(str_get(&gs), stderr);
+	sym_warnings++;
 }
 
 void sym_calc_value(struct symbol *sym)
 {
 	struct symbol_value newval, oldval;
 	struct property *prop;
+	const char *werror;
 	struct expr *e;
 
 	if (!sym)
@@ -338,8 +341,9 @@ void sym_calc_value(struct symbol *sym)
 		sym_calc_value(prop_get_symbol(prop));
 	}
 
+	werror = getenv("KCONFIG_WERROR");
+	sym_warnings = 0;
 	sym->flags |= SYMBOL_VALID;
-
 	oldval = sym->curr;
 
 	switch (sym->type) {
@@ -430,6 +434,9 @@ void sym_calc_value(struct symbol *sym)
 		;
 	}
 
+	if (sym_warnings && werror)
+		exit(1);
+
 	sym->curr = newval;
 	if (sym_is_choice(sym) && newval.tri == yes)
 		sym->curr.val = sym_calc_choice(sym);