Date:   Mon, 7 Mar 2022 10:17:17 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Chun-Tse Shao <ctshao@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     rostedt@...dmis.org, nicolas@...sle.eu, robh+dt@...nel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Frank Rowand <frowand.list@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        keyrings@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4] config: Allow kernel installation packaging to
 override pkg-config

On Sun, Mar 6, 2022 at 2:39 PM Chun-Tse Shao <ctshao@...gle.com> wrote:
>
> Add HOSTPKG_CONFIG to allow tooling that builds the kernel to override
> what pkg-config and parameters are used.

Sorry, kind a late thought here for v4, but we don't seem to prefix
many other host side tools with HOST_, i.e. LEX, YACC, AWK, PERL,
PYTHON3, etc.  Maybe just having the variable identifier be simply
PKGCONFIG rather than HOSTPKG_CONFIG then put it at the end of the
list in the top level Makefile after ZSTD (i.e. the list of host
tools)?  There's HOST_ prefixes when there's more than one tool
involved (i.e. host compiler vs target compiler), but I suspect
there's no such distinction for the existing uses of pkg-config?

Otherwise, sorry for opening a bikeshed so late; this patch still LGTM.
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

>
> Signed-off-by: Chun-Tse Shao <ctshao@...gle.com>
> ---
> Changes from v3: https://lore.kernel.org/all/20220304041449.939308-1-ctshao@google.com
>   - Dereference variables using {} instead of () in shell scripts
>   - Tested with make allmodconfig
>
> Changes from v2: https://lore.kernel.org/all/20220302193638.11034-1-ctshao@google.com/
>   - Fix more open coded instance of pkg-config in scripts and certs
>   - Tested with make allmodconfig
>
> Changes from v1: https://lore.kernel.org/all/20220301230629.1892828-1-ctshao@google.com/
>   - Make the commit message more clearer.
> ---
>  Makefile                     |  3 ++-
>  certs/Makefile               |  4 ++--
>  scripts/Makefile             |  4 ++--
>  scripts/dtc/Makefile         |  6 +++---
>  scripts/kconfig/gconf-cfg.sh | 10 +++++-----
>  scripts/kconfig/mconf-cfg.sh | 14 +++++++-------
>  scripts/kconfig/nconf-cfg.sh | 14 +++++++-------
>  scripts/kconfig/qconf-cfg.sh | 14 +++++++-------
>  tools/objtool/Makefile       |  4 ++--
>  9 files changed, 37 insertions(+), 36 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index daeb5c88b50b..f6c5bef7e141 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -430,6 +430,7 @@ else
>  HOSTCC = gcc
>  HOSTCXX        = g++
>  endif
> +HOSTPKG_CONFIG = pkg-config
>
>  export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
>                               -O2 -fomit-frame-pointer -std=gnu89
> @@ -525,7 +526,7 @@ KBUILD_LDFLAGS_MODULE :=
>  KBUILD_LDFLAGS :=
>  CLANG_FLAGS :=
>
> -export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
> +export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
>  export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
>  export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
>  export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
> diff --git a/certs/Makefile b/certs/Makefile
> index 3ea7fe60823f..fa540d14ef2d 100644
> --- a/certs/Makefile
> +++ b/certs/Makefile
> @@ -89,5 +89,5 @@ targets += x509_revocation_list
>
>  hostprogs := extract-cert
>
> -HOSTCFLAGS_extract-cert.o = $(shell pkg-config --cflags libcrypto 2> /dev/null)
> -HOSTLDLIBS_extract-cert = $(shell pkg-config --libs libcrypto 2> /dev/null || echo -lcrypto)
> +HOSTCFLAGS_extract-cert.o = $(shell $(HOSTPKG_CONFIG) --cflags libcrypto 2> /dev/null)
> +HOSTLDLIBS_extract-cert = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null || echo -lcrypto)
> diff --git a/scripts/Makefile b/scripts/Makefile
> index ce5aa9030b74..f084f08ed176 100644
> --- a/scripts/Makefile
> +++ b/scripts/Makefile
> @@ -14,8 +14,8 @@ hostprogs-always-$(CONFIG_SYSTEM_EXTRA_CERTIFICATE)   += insert-sys-cert
>  HOSTCFLAGS_sorttable.o = -I$(srctree)/tools/include
>  HOSTLDLIBS_sorttable = -lpthread
>  HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include
> -HOSTCFLAGS_sign-file.o = $(shell pkg-config --cflags libcrypto 2> /dev/null)
> -HOSTLDLIBS_sign-file = $(shell pkg-config --libs libcrypto 2> /dev/null || echo -lcrypto)
> +HOSTCFLAGS_sign-file.o = $(shell $(HOSTPKG_CONFIG) --cflags libcrypto 2> /dev/null)
> +HOSTLDLIBS_sign-file = $(shell $(HOSTPKG_CONFIG) --libs libcrypto 2> /dev/null || echo -lcrypto)
>
>  ifdef CONFIG_UNWINDER_ORC
>  ifeq ($(ARCH),x86_64)
> diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
> index 95aaf7431bff..743fc08827ea 100644
> --- a/scripts/dtc/Makefile
> +++ b/scripts/dtc/Makefile
> @@ -18,7 +18,7 @@ fdtoverlay-objs       := $(libfdt) fdtoverlay.o util.o
>  # Source files need to get at the userspace version of libfdt_env.h to compile
>  HOST_EXTRACFLAGS += -I $(srctree)/$(src)/libfdt
>
> -ifeq ($(shell pkg-config --exists yaml-0.1 2>/dev/null && echo yes),)
> +ifeq ($(shell $(HOSTPKG_CONFIG) --exists yaml-0.1 2>/dev/null && echo yes),)
>  ifneq ($(CHECK_DT_BINDING)$(CHECK_DTBS),)
>  $(error dtc needs libyaml for DT schema validation support. \
>         Install the necessary libyaml development package.)
> @@ -27,9 +27,9 @@ HOST_EXTRACFLAGS += -DNO_YAML
>  else
>  dtc-objs       += yamltree.o
>  # To include <yaml.h> installed in a non-default path
> -HOSTCFLAGS_yamltree.o := $(shell pkg-config --cflags yaml-0.1)
> +HOSTCFLAGS_yamltree.o := $(shell $(HOSTPKG_CONFIG) --cflags yaml-0.1)
>  # To link libyaml installed in a non-default path
> -HOSTLDLIBS_dtc := $(shell pkg-config yaml-0.1 --libs)
> +HOSTLDLIBS_dtc := $(shell $(HOSTPKG_CONFIG) yaml-0.1 --libs)
>  endif
>
>  # Generated files need one more search path to include headers in source tree
> diff --git a/scripts/kconfig/gconf-cfg.sh b/scripts/kconfig/gconf-cfg.sh
> index 480ecd8b9f41..4da4e39dcb53 100755
> --- a/scripts/kconfig/gconf-cfg.sh
> +++ b/scripts/kconfig/gconf-cfg.sh
> @@ -3,14 +3,14 @@
>
>  PKG="gtk+-2.0 gmodule-2.0 libglade-2.0"
>
> -if [ -z "$(command -v pkg-config)" ]; then
> +if [ -z "$(command -v ${HOSTPKG_CONFIG})" ]; then
>         echo >&2 "*"
>         echo >&2 "* 'make gconfig' requires 'pkg-config'. Please install it."
>         echo >&2 "*"
>         exit 1
>  fi
>
> -if ! pkg-config --exists $PKG; then
> +if ! ${HOSTPKG_CONFIG} --exists $PKG; then
>         echo >&2 "*"
>         echo >&2 "* Unable to find the GTK+ installation. Please make sure that"
>         echo >&2 "* the GTK+ 2.0 development package is correctly installed."
> @@ -19,12 +19,12 @@ if ! pkg-config --exists $PKG; then
>         exit 1
>  fi
>
> -if ! pkg-config --atleast-version=2.0.0 gtk+-2.0; then
> +if ! ${HOSTPKG_CONFIG} --atleast-version=2.0.0 gtk+-2.0; then
>         echo >&2 "*"
>         echo >&2 "* GTK+ is present but version >= 2.0.0 is required."
>         echo >&2 "*"
>         exit 1
>  fi
>
> -echo cflags=\"$(pkg-config --cflags $PKG)\"
> -echo libs=\"$(pkg-config --libs $PKG)\"
> +echo cflags=\"$(${HOSTPKG_CONFIG} --cflags $PKG)\"
> +echo libs=\"$(${HOSTPKG_CONFIG} --libs $PKG)\"
> diff --git a/scripts/kconfig/mconf-cfg.sh b/scripts/kconfig/mconf-cfg.sh
> index b520e407a8eb..05837ed07fbd 100755
> --- a/scripts/kconfig/mconf-cfg.sh
> +++ b/scripts/kconfig/mconf-cfg.sh
> @@ -4,16 +4,16 @@
>  PKG="ncursesw"
>  PKG2="ncurses"
>
> -if [ -n "$(command -v pkg-config)" ]; then
> -       if pkg-config --exists $PKG; then
> -               echo cflags=\"$(pkg-config --cflags $PKG)\"
> -               echo libs=\"$(pkg-config --libs $PKG)\"
> +if [ -n "$(command -v ${HOSTPKG_CONFIG})" ]; then
> +       if ${HOSTPKG_CONFIG} --exists $PKG; then
> +               echo cflags=\"$(${HOSTPKG_CONFIG} --cflags $PKG)\"
> +               echo libs=\"$(${HOSTPKG_CONFIG} --libs $PKG)\"
>                 exit 0
>         fi
>
> -       if pkg-config --exists $PKG2; then
> -               echo cflags=\"$(pkg-config --cflags $PKG2)\"
> -               echo libs=\"$(pkg-config --libs $PKG2)\"
> +       if ${HOSTPKG_CONFIG} --exists $PKG2; then
> +               echo cflags=\"$(${HOSTPKG_CONFIG} --cflags $PKG2)\"
> +               echo libs=\"$(${HOSTPKG_CONFIG} --libs $PKG2)\"
>                 exit 0
>         fi
>  fi
> diff --git a/scripts/kconfig/nconf-cfg.sh b/scripts/kconfig/nconf-cfg.sh
> index c212255070c0..e8d8f12d93ac 100755
> --- a/scripts/kconfig/nconf-cfg.sh
> +++ b/scripts/kconfig/nconf-cfg.sh
> @@ -4,16 +4,16 @@
>  PKG="ncursesw menuw panelw"
>  PKG2="ncurses menu panel"
>
> -if [ -n "$(command -v pkg-config)" ]; then
> -       if pkg-config --exists $PKG; then
> -               echo cflags=\"$(pkg-config --cflags $PKG)\"
> -               echo libs=\"$(pkg-config --libs $PKG)\"
> +if [ -n "$(command -v ${HOSTPKG_CONFIG})" ]; then
> +       if ${HOSTPKG_CONFIG} --exists $PKG; then
> +               echo cflags=\"$(${HOSTPKG_CONFIG} --cflags $PKG)\"
> +               echo libs=\"$(${HOSTPKG_CONFIG} --libs $PKG)\"
>                 exit 0
>         fi
>
> -       if pkg-config --exists $PKG2; then
> -               echo cflags=\"$(pkg-config --cflags $PKG2)\"
> -               echo libs=\"$(pkg-config --libs $PKG2)\"
> +       if ${HOSTPKG_CONFIG} --exists $PKG2; then
> +               echo cflags=\"$(${HOSTPKG_CONFIG} --cflags $PKG2)\"
> +               echo libs=\"$(${HOSTPKG_CONFIG} --libs $PKG2)\"
>                 exit 0
>         fi
>  fi
> diff --git a/scripts/kconfig/qconf-cfg.sh b/scripts/kconfig/qconf-cfg.sh
> index fa564cd795b7..9b695e5cd9b3 100755
> --- a/scripts/kconfig/qconf-cfg.sh
> +++ b/scripts/kconfig/qconf-cfg.sh
> @@ -3,22 +3,22 @@
>
>  PKG="Qt5Core Qt5Gui Qt5Widgets"
>
> -if [ -z "$(command -v pkg-config)" ]; then
> +if [ -z "$(command -v ${HOSTPKG_CONFIG})" ]; then
>         echo >&2 "*"
> -       echo >&2 "* 'make xconfig' requires 'pkg-config'. Please install it."
> +       echo >&2 "* 'make xconfig' requires '${HOSTPKG_CONFIG}'. Please install it."
>         echo >&2 "*"
>         exit 1
>  fi
>
> -if pkg-config --exists $PKG; then
> -       echo cflags=\"-std=c++11 -fPIC $(pkg-config --cflags $PKG)\"
> -       echo libs=\"$(pkg-config --libs $PKG)\"
> -       echo moc=\"$(pkg-config --variable=host_bins Qt5Core)/moc\"
> +if ${HOSTPKG_CONFIG} --exists $PKG; then
> +       echo cflags=\"-std=c++11 -fPIC $(${HOSTPKG_CONFIG} --cflags $PKG)\"
> +       echo libs=\"$(${HOSTPKG_CONFIG} --libs $PKG)\"
> +       echo moc=\"$(${HOSTPKG_CONFIG} --variable=host_bins Qt5Core)/moc\"
>         exit 0
>  fi
>
>  echo >&2 "*"
> -echo >&2 "* Could not find Qt5 via pkg-config."
> +echo >&2 "* Could not find Qt5 via ${HOSTPKG_CONFIG}."
>  echo >&2 "* Please install Qt5 and make sure it's in PKG_CONFIG_PATH"
>  echo >&2 "*"
>  exit 1
> diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
> index 92ce4fce7bc7..549acc5859e9 100644
> --- a/tools/objtool/Makefile
> +++ b/tools/objtool/Makefile
> @@ -19,8 +19,8 @@ LIBSUBCMD             = $(LIBSUBCMD_OUTPUT)libsubcmd.a
>  OBJTOOL    := $(OUTPUT)objtool
>  OBJTOOL_IN := $(OBJTOOL)-in.o
>
> -LIBELF_FLAGS := $(shell pkg-config libelf --cflags 2>/dev/null)
> -LIBELF_LIBS  := $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
> +LIBELF_FLAGS := $(shell $(HOSTPKG_CONFIG) libelf --cflags 2>/dev/null)
> +LIBELF_LIBS  := $(shell $(HOSTPKG_CONFIG) libelf --libs 2>/dev/null || echo -lelf)
>
>  all: $(OBJTOOL)
>
> --
> 2.35.1.616.g0bdcbb4464-goog
>


-- 
Thanks,
~Nick Desaulniers

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