linux-kernel - [PATCH 1/3] kbuild: add stringify helper to quote a string passed to C files

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Date:   Thu, 19 Dec 2019 17:33:27 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     Lucas De Marchi <lucas.de.marchi@...il.com>,
        Sam Ravnborg <sam@...nborg.org>, Jessica Yu <jeyu@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] kbuild: add stringify helper to quote a string passed to C files

Make $(squote)$(quote)...$(quote)$(squote) a helper macro.
I will reuse it in the next commit.

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

 scripts/Kbuild.include | 4 ++++
 scripts/Makefile.lib   | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index bc5f25763c1b..88c144787e57 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -32,6 +32,10 @@ real-prereqs = $(filter-out $(PHONY), $^)
 # Escape single quote for use in echo statements
 escsq = $(subst $(squote),'\$(squote)',$1)
 
+###
+# Quote a string to pass it to C files. foo => '"foo"'
+stringify = $(squote)$(quote)$1$(quote)$(squote)
+
 ###
 # Easy method for doing a status message
        kecho := :
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 3fa32f83b2d7..e4c47ad2899d 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -93,7 +93,7 @@ target-stem = $(basename $(patsubst $(obj)/%,%,$@))
 # These flags are needed for modversions and compiling, so we define them here
 # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
 # end up in (or would, if it gets compiled in)
-name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
+name-fix = $(call stringify,$(subst $(comma),_,$(subst -,_,$1)))
 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
 modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname))
 
-- 
2.17.1