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Subject[PATCH] kbuild: check for pkg-config on make menu/n/g/xconfig
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From: Randy Dunlap <rdunlap@infradead.org>

Each of 'make {menu,n,g,x}config' uses (needs) pkg-config to make sure
that other required files are present, but none of these check that
pkg-config itself is present. Add a check for all 4 of these targets.

Fixes kernel bugzilla #77511:
https://bugzilla.kernel.org/show_bug.cgi?id=77511

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
---
I'm also OK with just documenting the pkg-config requirement in
Documentation/Changes (= Documentation/process/changes.rst).

+ chmod +x scripts/kconfig/check-pkgconfig.sh

scripts/kconfig/Makefile | 15 ++++++++++++++-
scripts/kconfig/check-pkgconfig.sh | 13 +++++++++++++
2 files changed, 27 insertions(+), 1 deletion(-)

--- lnx-416-rc3.orig/scripts/kconfig/Makefile
+++ lnx-416-rc3/scripts/kconfig/Makefile
@@ -160,6 +160,9 @@ help:
@echo ' xenconfig - Enable additional options for xen dom0 and guest kernel support'
@echo ' tinyconfig - Configure the tiniest possible kernel'

+# pkg-config check
+check-pkgconfig := $(srctree)/$(src)/check-pkgconfig.sh
+
# lxdialog stuff
check-lxdialog := $(srctree)/$(src)/lxdialog/check-lxdialog.sh

@@ -205,7 +208,17 @@ $(addprefix $(obj)/, mconf.o $(lxdialog)
$(obj)/dochecklxdialog:
$(Q)$(CONFIG_SHELL) $(check-lxdialog) -check $(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTLOADLIBES_mconf)

-always := dochecklxdialog
+# Check that we have pkg-config (used by each of menu/n/g/xconfig)
+PHONY += $(obj)/docheckpkgconfig
+$(addprefix $(obj)/, mconf.o): $(obj)/docheckpkgconfig
+$(addprefix $(obj)/, nconf.o): $(obj)/docheckpkgconfig
+$(addprefix $(obj)/, gconf.o): $(obj)/docheckpkgconfig
+$(addprefix $(obj)/, qconf.o): $(obj)/docheckpkgconfig
+
+$(obj)/docheckpkgconfig:
+ $(Q)$(CONFIG_SHELL) $(check-pkgconfig)
+
+always := docheckpkgconfig dochecklxdialog

# Add environment specific flags
HOST_EXTRACFLAGS += $(shell $(CONFIG_SHELL) $(srctree)/$(src)/check.sh $(HOSTCC) $(HOSTCFLAGS))
--- /dev/null
+++ lnx-416-rc3/scripts/kconfig/check-pkgconfig.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Check for pkg-config presence
+
+pkgcfg=`which pkg-config >/dev/null 2>&1`
+found=$?
+
+if [ $found -ne 0 ]; then
+ echo "'make *config' requires 'pkg-config'. Please install it." 1>&2
+ exit 1 # error
+fi
+
+exit 0

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