From 38f6aa7f5401d8322daa0b978df10d5fda2a613e Mon Sep 17 00:00:00 2001
From: Cem Keylan <cem@ckyln.com>
Date: Sun, 27 Dec 2020 20:26:32 +0300
Subject: experimental: add initial cross-compilation support

---
 core/binutils/build   | 15 +++++----------
 core/busybox/build    |  6 ++++--
 core/byacc/build      |  3 +--
 core/bzip2/build      |  8 +++++---
 core/carbs-init/build |  4 +++-
 core/curl/build       |  3 +--
 core/flex/build       |  4 +---
 core/gzip/build       |  2 ++
 core/libelf/build     |  3 +--
 core/m4/build         |  3 +--
 core/musl/build       |  4 +---
 core/zlib/build       |  3 +++
 12 files changed, 28 insertions(+), 30 deletions(-)

diff --git a/core/binutils/build b/core/binutils/build
index 67a1af16..61c53318 100755
--- a/core/binutils/build
+++ b/core/binutils/build
@@ -1,12 +1,8 @@
 #!/bin/sh -e
 
 # Architecture specific build options
-case ${3:-$(uname -m)} in
-    i*86)  archopts="--build=i686-pc-linux-musl \
-                     --host=i686-pc-linux-musl \
-                     --enable-64-bit-bfd" ;;
-    x86_64) archopts="--build=x86_64-pc-linux-musl \
-                      --host=x86_64-pc-linux-musl"
+case "$3" in
+    i?86) archopts="--enable-64-bit-bfd"
 esac
 
 cat > makeinfo <<EOF
@@ -19,9 +15,7 @@ export PATH=$PATH:$PWD
 
 # Word splitting is intentional here.
 # shellcheck disable=2086
-./configure \
-    --prefix=/usr \
-    $archopts \
+cpt-configure \
     --enable-targets=x86_64-pep \
     --disable-multilib \
     --disable-werror \
@@ -30,7 +24,8 @@ export PATH=$PATH:$PWD
     --disable-readline \
     --disable-gprof \
     --with-mmap \
-    --with-system-zlib
+    --with-system-zlib \
+    "$archopts"
 
 make
 make DESTDIR="$1" install
diff --git a/core/busybox/build b/core/busybox/build
index df00282d..2a3f38c1 100755
--- a/core/busybox/build
+++ b/core/busybox/build
@@ -10,9 +10,11 @@ for patch in *.patch; do
     patch -p1 < "$patch"
 done
 
+[ "$CPT_CROSS_TRIPLET" ] && CC=$CPT_CROSS_TRIPLET-cc
+
 # Build and install regular busybox.
 # This excludes utilities which require 'suid' to function.
-make CC="${CC:-gcc}"
+make CC="${CC:=gcc}"
 make CONFIG_PREFIX="$1/usr" install
 
 # Rename the binary temporarily.
@@ -21,7 +23,7 @@ mv "$1/usr/bin/busybox" "$1/usr/bin/busybox-nosuid"
 # Build and install suid busybox.
 # This _only_ includes utlities which require 'suid' to function.
 cp -f .config-suid .config
-make CC="${CC:-gcc}"
+make CC="$CC"
 make CONFIG_PREFIX="$1/usr" install
 
 # Aptly name the busybox binaries.
diff --git a/core/byacc/build b/core/byacc/build
index cc21d9ed..f3cc6001 100755
--- a/core/byacc/build
+++ b/core/byacc/build
@@ -2,8 +2,7 @@
 
 export LDFLAGS="$LDFLAGS -static"
 
-./configure \
-    --prefix=/usr \
+cpt-configure \
     --program-transform='s/^/b/'
 
 make
diff --git a/core/bzip2/build b/core/bzip2/build
index ac1055b2..209cce27 100755
--- a/core/bzip2/build
+++ b/core/bzip2/build
@@ -1,10 +1,12 @@
 #!/bin/sh -e
 
+[ "$CPT_CROSS_TARGET" ] && CC=$CPT_CROSS_TARGET-cc
+
 make CC="${CC:-cc} $CFLAGS -fPIC $LDFLAGS" -f Makefile-libbz2_so
-make CC="${CC:-cc} $CFLAGS -fPIC $LDFLAGS" bzip2recover libbz2.a
+make CC="${CC:-cc} $CFLAGS -fPIC $LDFLAGS -static" bzip2 bzip2recover libbz2.a
 
-for bin in bzip2-shared bzdiff bzgrep bzip2recover bzmore; do
-    install -Dm755 "$bin" "$1/usr/bin/${bin%%-shared}"
+for bin in bzip2 bzdiff bzgrep bzip2recover bzmore; do
+    install -Dm755 "$bin" "$1/usr/bin/$bin"
 done
 
 install -Dm755 libbz2.so.1.0.8 "$1/usr/lib/libbz2.so.1.0.8"
diff --git a/core/carbs-init/build b/core/carbs-init/build
index c46dc3e2..4fa04cb5 100755
--- a/core/carbs-init/build
+++ b/core/carbs-init/build
@@ -2,4 +2,6 @@
 
 patch -p1 < respawn-fix.patch
 
-make DESTDIR="$1" install
+[ "$CPT_CROSS_TRIPLET" ] && CC=$CPT_CROSS_TRIPLET-cc
+
+make CC="${CC:-cc}" DESTDIR="$1" install
diff --git a/core/curl/build b/core/curl/build
index f27b1522..f5630ab3 100755
--- a/core/curl/build
+++ b/core/curl/build
@@ -1,7 +1,6 @@
 #!/bin/sh -e
 
-./configure \
-    --prefix=/usr \
+cpt-configure \
     --enable-ipv6 \
     --enable-unix-sockets \
     --enable-hidden-symbols \
diff --git a/core/flex/build b/core/flex/build
index c0aa1260..e0305c7c 100755
--- a/core/flex/build
+++ b/core/flex/build
@@ -1,8 +1,6 @@
 #!/bin/sh -e
 
-./configure \
-    --prefix=/usr \
-    --disable-static \
+cpt-configure \
     --enable-shared \
     ac_cv_func_malloc_0_nonnull=yes \
     ac_cv_func_realloc_0_nonnull=yes
diff --git a/core/gzip/build b/core/gzip/build
index 8d190a07..aecc904a 100755
--- a/core/gzip/build
+++ b/core/gzip/build
@@ -1,5 +1,7 @@
 #!/bin/sh -e
 
+[ "$CPT_CROSS_TRIPLET" ] &&
+    CC="$CPT_CROSS_TRIPLET-cc -L$CPT_ROOT/usr/lib -isystem -isystem $CPT_ROOT/usr/include"
 make CC="${CC:-cc} -static"
 
 install -Dm755 pigz   "$1/usr/bin/pigz"
diff --git a/core/libelf/build b/core/libelf/build
index 7bade69a..003b171e 100755
--- a/core/libelf/build
+++ b/core/libelf/build
@@ -9,8 +9,7 @@ sed -i 's/as_fn_error.*libargp/: "/g' configure
 # Don't compile two unrelated C files which require argp.
 sed -i 's/color.*printversion../#/g' lib/Makefile.in
 
-./configure \
-    --prefix=/usr \
+cpt-configure \
     --disable-symbol-versioning \
     --disable-debuginfod \
     --disable-nls
diff --git a/core/m4/build b/core/m4/build
index bbd53ee2..adbcf2ea 100755
--- a/core/m4/build
+++ b/core/m4/build
@@ -2,8 +2,7 @@
 
 export LDFLAGS="$LDFLAGS -static"
 
-./configure \
-    --prefix=/usr
+cpt-configure
 
 make
 make DESTDIR="$1" install
diff --git a/core/musl/build b/core/musl/build
index 44b80ec1..d5971790 100755
--- a/core/musl/build
+++ b/core/musl/build
@@ -18,9 +18,7 @@ kinstall_t() {
 
 patch -p0 < CVE-2020-28928.patch
 
-./configure \
-    --prefix=/usr \
-    --syslibdir=/usr/lib
+cpt-configure
 
 make
 make DESTDIR="$1" install
diff --git a/core/zlib/build b/core/zlib/build
index 01090e82..c14fa524 100755
--- a/core/zlib/build
+++ b/core/zlib/build
@@ -1,5 +1,8 @@
 #!/bin/sh -e
 
+[ "$CPT_CROSS_TRIPLET" ] && CC=$CPT_CROSS_TRIPLET-cc
+export CC
+
 ./configure \
     --prefix=/usr \
     --libdir=/usr/lib \
-- 
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