kbuild: do not quote string values in include/config/auto.conf

The previous commit fixed up all shell scripts to not include
include/config/auto.conf.

Now that include/config/auto.conf is only included by Makefiles,
we can change it into a more Make-friendly form.

Previously, Kconfig output string values enclosed with double-quotes
(both in the .config and include/config/auto.conf):

    CONFIG_X="foo bar"

Unlike shell, Make handles double-quotes (and single-quotes as well)
verbatim. We must rip them off when used.

There are some patterns:

  [1] $(patsubst "%",%,$(CONFIG_X))
  [2] $(CONFIG_X:"%"=%)
  [3] $(subst ",,$(CONFIG_X))
  [4] $(shell echo $(CONFIG_X))

These are not only ugly, but also fragile.

[1] and [2] do not work if the value contains spaces, like
   CONFIG_X=" foo bar "

[3] does not work correctly if the value contains double-quotes like
   CONFIG_X="foo\"bar"

[4] seems to work better, but has a cost of forking a process.

Anyway, quoted strings were always PITA for our Makefiles.

This commit changes Kconfig to stop quoting in include/config/auto.conf.

These are the string type symbols referenced in Makefiles or scripts:

    ACPI_CUSTOM_DSDT_FILE
    ARC_BUILTIN_DTB_NAME
    ARC_TUNE_MCPU
    BUILTIN_DTB_SOURCE
    CC_IMPLICIT_FALLTHROUGH
    CC_VERSION_TEXT
    CFG80211_EXTRA_REGDB_KEYDIR
    EXTRA_FIRMWARE
    EXTRA_FIRMWARE_DIR
    EXTRA_TARGETS
    H8300_BUILTIN_DTB
    INITRAMFS_SOURCE
    LOCALVERSION
    MODULE_SIG_HASH
    MODULE_SIG_KEY
    NDS32_BUILTIN_DTB
    NIOS2_DTB_SOURCE
    OPENRISC_BUILTIN_DTB
    SOC_CANAAN_K210_DTB_SOURCE
    SYSTEM_BLACKLIST_HASH_LIST
    SYSTEM_REVOCATION_KEYS
    SYSTEM_TRUSTED_KEYS
    TARGET_CPU
    UNUSED_KSYMS_WHITELIST
    XILINX_MICROBLAZE0_FAMILY
    XILINX_MICROBLAZE0_HW_VER
    XTENSA_VARIANT_NAME

I checked them one by one, and fixed up the code where necessary.

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

12 files changed, 14 insertions, 35 deletions

diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index f252e7b924e9..efc54f3e35e0 100644
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -14,10 +14,10 @@ cflags-y	+= -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__
 tune-mcpu-def-$(CONFIG_ISA_ARCOMPACT)	:= -mcpu=arc700
 tune-mcpu-def-$(CONFIG_ISA_ARCV2)	:= -mcpu=hs38
 
-ifeq ($(CONFIG_ARC_TUNE_MCPU),"")
+ifeq ($(CONFIG_ARC_TUNE_MCPU),)
 cflags-y				+= $(tune-mcpu-def-y)
 else
-tune-mcpu				:= $(shell echo $(CONFIG_ARC_TUNE_MCPU))
+tune-mcpu				:= $(CONFIG_ARC_TUNE_MCPU)
 ifneq ($(call cc-option,$(tune-mcpu)),)
 cflags-y				+= $(tune-mcpu)
 else
diff --git a/arch/arc/boot/dts/Makefile b/arch/arc/boot/dts/Makefile
index 8483a86c743d..4237aa5de3a3 100644
--- a/arch/arc/boot/dts/Makefile
+++ b/arch/arc/boot/dts/Makefile
@@ -2,8 +2,8 @@
 # Built-in dtb
 builtindtb-y		:= nsim_700
 
-ifneq ($(CONFIG_ARC_BUILTIN_DTB_NAME),"")
-	builtindtb-y	:= $(patsubst "%",%,$(CONFIG_ARC_BUILTIN_DTB_NAME))
+ifneq ($(CONFIG_ARC_BUILTIN_DTB_NAME),)
+	builtindtb-y	:= $(CONFIG_ARC_BUILTIN_DTB_NAME)
 endif
 
 obj-y   += $(builtindtb-y).dtb.o
diff --git a/arch/h8300/boot/dts/Makefile b/arch/h8300/boot/dts/Makefile
index 69fcd817892c..c36bbd1f2592 100644
--- a/arch/h8300/boot/dts/Makefile
+++ b/arch/h8300/boot/dts/Makefile
@@ -1,9 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-ifneq '$(CONFIG_H8300_BUILTIN_DTB)' '""'
-BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_H8300_BUILTIN_DTB)).dtb.o
-endif
-
-obj-y += $(BUILTIN_DTB)
+obj-y += $(addsuffix .dtb.o, $(CONFIG_H8300_BUILTIN_DTB))
 
 dtb-$(CONFIG_H8300H_SIM) := h8300h_sim.dtb
 dtb-$(CONFIG_H8S_SIM) := h8s_sim.dtb
diff --git a/arch/microblaze/Makefile b/arch/microblaze/Makefile
index e775a696aa6f..a25e76d89e86 100644
--- a/arch/microblaze/Makefile
+++ b/arch/microblaze/Makefile
@@ -5,7 +5,7 @@ UTS_SYSNAME = -DUTS_SYSNAME=\"Linux\"
 
 # What CPU version are we building for, and crack it open
 # as major.minor.rev
-CPU_VER   := $(shell echo $(CONFIG_XILINX_MICROBLAZE0_HW_VER))
+CPU_VER   := $(CONFIG_XILINX_MICROBLAZE0_HW_VER)
 CPU_MAJOR := $(shell echo $(CPU_VER) | cut -d '.' -f 1)
 CPU_MINOR := $(shell echo $(CPU_VER) | cut -d '.' -f 2)
 CPU_REV   := $(shell echo $(CPU_VER) | cut -d '.' -f 3)
diff --git a/arch/nds32/boot/dts/Makefile b/arch/nds32/boot/dts/Makefile
index f84bd529b6fd..4fc69562eae8 100644
--- a/arch/nds32/boot/dts/Makefile
+++ b/arch/nds32/boot/dts/Makefile
@@ -1,7 +1,2 @@
 # SPDX-License-Identifier: GPL-2.0-only
-ifneq '$(CONFIG_NDS32_BUILTIN_DTB)' '""'
-BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_NDS32_BUILTIN_DTB)).dtb.o
-else
-BUILTIN_DTB :=
-endif
-obj-$(CONFIG_OF) += $(BUILTIN_DTB)
+obj-$(CONFIG_OF) += $(addsuffix .dtb.o, $(CONFIG_NDS32_BUILTIN_DTB))
diff --git a/arch/nios2/boot/dts/Makefile b/arch/nios2/boot/dts/Makefile
index a91a0b09be63..e9e31bb40df8 100644
--- a/arch/nios2/boot/dts/Makefile
+++ b/arch/nios2/boot/dts/Makefile
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 
-obj-y := $(patsubst "%.dts",%.dtb.o,$(CONFIG_NIOS2_DTB_SOURCE))
+obj-y := $(patsubst %.dts,%.dtb.o,$(CONFIG_NIOS2_DTB_SOURCE))
 
 dtstree		:= $(srctree)/$(src)
 dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts))
diff --git a/arch/openrisc/boot/dts/Makefile b/arch/openrisc/boot/dts/Makefile
index 17dd791a833f..13db5a2aab52 100644
--- a/arch/openrisc/boot/dts/Makefile
+++ b/arch/openrisc/boot/dts/Makefile
@@ -1,9 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-ifneq '$(CONFIG_OPENRISC_BUILTIN_DTB)' '""'
-BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_OPENRISC_BUILTIN_DTB)).dtb.o
-else
-BUILTIN_DTB :=
-endif
-obj-y += $(BUILTIN_DTB)
+obj-y += $(addsuffix .dtb.o, $(CONFIG_OPENRISC_BUILTIN_DTB))
 
 #DTC_FLAGS ?= -p 1024
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 9993c6256ad2..4b4827c475c6 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -365,7 +365,7 @@ image-$(CONFIG_PPC_PMAC)	+= zImage.coff zImage.miboot
 endif
 
 # Allow extra targets to be added to the defconfig
-image-y	+= $(subst ",,$(CONFIG_EXTRA_TARGETS))
+image-y	+= $(CONFIG_EXTRA_TARGETS)
 
 initrd-  := $(patsubst zImage%, zImage.initrd%, $(image-))
 initrd-y := $(patsubst zImage%, zImage.initrd%, \
diff --git a/arch/riscv/boot/dts/canaan/Makefile b/arch/riscv/boot/dts/canaan/Makefile
index 9ee7156c0c31..c61b08ac8554 100644
--- a/arch/riscv/boot/dts/canaan/Makefile
+++ b/arch/riscv/boot/dts/canaan/Makefile
@@ -1,5 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
-ifneq ($(CONFIG_SOC_CANAAN_K210_DTB_SOURCE),"")
-dtb-y += $(strip $(shell echo $(CONFIG_SOC_CANAAN_K210_DTB_SOURCE))).dtb
+dtb-$(CONFIG_SOC_CANAAN_K210_DTB_BUILTIN) += $(addsuffix .dtb, $(CONFIG_SOC_CANAAN_K210_DTB_SOURCE))
 obj-$(CONFIG_SOC_CANAAN_K210_DTB_BUILTIN) += $(addsuffix .o, $(dtb-y))
-endif
diff --git a/arch/sh/boot/dts/Makefile b/arch/sh/boot/dts/Makefile
index c17d65b82abe..4a6dec9714a9 100644
--- a/arch/sh/boot/dts/Makefile
+++ b/arch/sh/boot/dts/Makefile
@@ -1,4 +1,2 @@
 # SPDX-License-Identifier: GPL-2.0-only
-ifneq ($(CONFIG_BUILTIN_DTB_SOURCE),"")
-obj-$(CONFIG_USE_BUILTIN_DTB) += $(patsubst "%",%,$(CONFIG_BUILTIN_DTB_SOURCE)).dtb.o
-endif
+obj-$(CONFIG_USE_BUILTIN_DTB) += $(addsuffix .dtb.o, $(CONFIG_BUILTIN_DTB_SOURCE))
diff --git a/arch/xtensa/Makefile b/arch/xtensa/Makefile
index 9778216d6e09..ee2769519eaf 100644
--- a/arch/xtensa/Makefile
+++ b/arch/xtensa/Makefile
@@ -12,7 +12,7 @@
 # Core configuration.
 # (Use VAR=<xtensa_config> to use another default compiler.)
 
-variant-y := $(patsubst "%",%,$(CONFIG_XTENSA_VARIANT_NAME))
+variant-y := $(CONFIG_XTENSA_VARIANT_NAME)
 
 VARIANT = $(variant-y)
 
diff --git a/arch/xtensa/boot/dts/Makefile b/arch/xtensa/boot/dts/Makefile
index 0b8d00cdae7c..720628c0d8b9 100644
--- a/arch/xtensa/boot/dts/Makefile
+++ b/arch/xtensa/boot/dts/Makefile
@@ -7,10 +7,7 @@
 #
 #
 
-BUILTIN_DTB_SOURCE := $(patsubst "%",%,$(CONFIG_BUILTIN_DTB_SOURCE)).dtb.o
-ifneq ($(CONFIG_BUILTIN_DTB_SOURCE),"")
-obj-$(CONFIG_OF) += $(BUILTIN_DTB_SOURCE)
-endif
+obj-$(CONFIG_OF) += $(addsuffix .dtb.o, $(CONFIG_BUILTIN_DTB_SOURCE))
 
 # for CONFIG_OF_ALL_DTBS test
 dtstree	:= $(srctree)/$(src)