Path and compile musl libc into kernel

toolchain/build-musl.sh

@@ -0,0 +1,26 @@
+#!/bin/sh -e
+
+target=x86_64-elf
+SYSROOT=/opt/sysroot
+
+# Pull or update musl libc
+mkdir -p /opt/external && cd /opt/external
+[ -d musl ] || git clone --depth=1 git://git.musl-libc.org/musl
+cd musl
+git reset --hard
+git pull
+
+[ -d /opt/src/patch-musl ] && rsync -a /opt/src/patch-musl/ /opt/external/musl/
+
+mkdir -p /opt/external/build-musl && cd /opt/external/build-musl
+rm -r *
+../musl/configure \
+    --target=${target} \
+    --prefix=${SYSROOT}/usr \
+    --disable-shared \
+    --enable-debug \
+    CFLAGS="-O0 -mcmodel=large"
+
+make
+make install-headers
+make install

toolchain/build-toolchain.sh

@@ -5,14 +5,31 @@ apk add gmp-dev mpfr-dev mpc1-dev
 
 apk add make
 apk add grub-bios xorriso
-apk add python3
+apk add python3 git rsync
 
 rm -rf /var/cache/apk/*
 
 target=x86_64-elf
+SYSROOT=/opt/sysroot
 binutils=binutils-2.37
 gcc=gcc-11.2.0
 
+mkdir -p /opt/external
+cd /opt/external
+[ -d musl ] || git clone --depth=1 git://git.musl-libc.org/musl
+cd musl
+git reset --hard
+git pull
+
+cat > config.mak << EOF
+ARCH=x86_64
+prefix=${SYSROOT}/usr
+includedir=\$(prefix)/include
+EOF
+
+make install-headers
+
+# Build binutils
 cd /opt
 wget http://ftp.gnu.org/gnu/binutils/${binutils}.tar.gz
 tar -xf ${binutils}.tar.gz
@@ -21,11 +38,12 @@ mkdir binutils-build && cd binutils-build
   --target=${target} \
   --disable-nls \
   --disable-werror \
-  --with-sysroot \
+  --with-sysroot=${SYSROOT}
 
 make -j 4
 make install
 
+# Build gcc and libgcc
 cd /opt
 wget http://ftp.gnu.org/gnu/gcc/${gcc}/${gcc}.tar.gz
 tar -xf ${gcc}.tar.gz
@@ -34,7 +52,7 @@ mkdir gcc-build && cd gcc-build
   --target=${target} \
   --disable-nls \
   --enable-languages=c \
-  --without-headers \
+  --with-sysroot=${SYSROOT}
 
 make all-gcc all-target-libgcc -j 4
 make install-gcc install-target-libgcc