linux-kernel - [PATCH] kconfig: shorten the temporary directory name for cc-option

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Date:   Tue, 19 Jul 2022 11:35:39 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] kconfig: shorten the temporary directory name for cc-option

The cc-option macro creates the temporary directory, .tmp_$$$$, which
is expanded into .tmp_<PID><PID>, but the second <PID> is redundant.
(<PID> is the process ID of the sub-shell)

If it were the Makefile code, .tmp_$$$$ would be the correct code.
(see the TMPOUT macro in scripts/Malefile.compiler)

In Makefile, '$$' is an escape sequence of '$'. Make expands '$$$$'
into '$$', then shell expands it into the process ID.

This does not apply to Kconfig because Kconfig requires variable
references to be enclosed by curly braces, like ${variable}.
The '$' that is not followed by '{' loses its special function.

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

 scripts/Kconfig.include | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
index 0496efd6e117..c1f4222d223d 100644
--- a/scripts/Kconfig.include
+++ b/scripts/Kconfig.include
@@ -25,7 +25,7 @@ failure = $(if-success,$(1),n,y)

 # $(cc-option,<flag>)
 # Return y if the compiler supports <flag>, n otherwise
-cc-option = $(success,mkdir .tmp_$$$$; trap "rm -rf .tmp_$$$$" EXIT; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$$$/tmp.o)
+cc-option = $(success,mkdir .tmp_$$; trap "rm -rf .tmp_$$" EXIT; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)

 # $(ld-option,<flag>)
 # Return y if the linker supports <flag>, n otherwise
-- 
2.34.1