From 60a609bec872a625faad1c7272c73365ad619559 Mon Sep 17 00:00:00 2001
From: Tomas Volf <~@wolfsden.cz>
Date: Thu, 9 May 2024 01:42:50 +0200
Subject: [PATCH] hack: Support picking cc and cpp via environment variables.

Until now `cc' was hard-coded as the only compiler used.  Supporting selecting
the compiler and preprocessor to be used via environment variables makes life
easier for distributors, so this commit mimics how podman does it in its hack/*
scripts.

Signed-off-by: Tomas Volf <~@wolfsden.cz>
---
 hack/btrfs_installed_tag.sh | 2 +-
 hack/btrfs_tag.sh           | 2 +-
 hack/libsubid_tag.sh        | 3 ++-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/hack/btrfs_installed_tag.sh b/hack/btrfs_installed_tag.sh
index c4d99f37..f2f2b33c 100755
--- a/hack/btrfs_installed_tag.sh
+++ b/hack/btrfs_installed_tag.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-cc -E - > /dev/null 2> /dev/null << EOF
+${CPP:-${CC:-cc} -E} ${CPPFLAGS} - > /dev/null 2> /dev/null << EOF
 #include <btrfs/ioctl.h>
 EOF
 if test $? -ne 0 ; then
diff --git a/hack/btrfs_tag.sh b/hack/btrfs_tag.sh
index 59cb969a..ea753d4d 100755
--- a/hack/btrfs_tag.sh
+++ b/hack/btrfs_tag.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-cc -E - > /dev/null 2> /dev/null << EOF
+${CPP:-${CC:-cc} -E} ${CPPFLAGS} - > /dev/null 2> /dev/null << EOF
 #include <btrfs/version.h>
 EOF
 if test $? -ne 0 ; then
diff --git a/hack/libsubid_tag.sh b/hack/libsubid_tag.sh
index 0f98e061..b788796c 100755
--- a/hack/libsubid_tag.sh
+++ b/hack/libsubid_tag.sh
@@ -5,7 +5,8 @@ fi
 tmpdir="$PWD/tmp.$RANDOM"
 mkdir -p "$tmpdir"
 trap 'rm -fr "$tmpdir"' EXIT
-cc -o "$tmpdir"/libsubid_tag -x c - -l subid > /dev/null 2> /dev/null << EOF
+${CC:-cc} ${CPPFLAGS} ${CFLAGS} -o "$tmpdir"/libsubid_tag -x c - -l subid \
+	  > /dev/null 2> /dev/null << EOF
 #include <shadow/subid.h>
 #include <stdlib.h>
 int main() {