Build: add support for building on OpenBSD

This requires gcc8 from ports to build the Toolchain.

Documentation/BuildInstructions.md

@@ -40,6 +40,13 @@ Notes:
 - osxfuse, e2fsprogs, m4, autoconf, automake, libtool and `BuildFuseExt2.sh` are needed if you want to build the root filesystem disk image natively on macOS. This allows mounting an EXT2 fs and also installs commands like `mke2fs` that are not available on stock macOS. 
 - If you install some commercial EXT2 macOS fs handler instead of osxfuse and fuse-ext2, you will need to `brew install e2fsprogs` to obtain `mke2fs` anyway.
 
+### OpenBSD prerequisites
+```
+pkg_add bash gmp gcc git flock gmake sudo
+```
+
+When building with `make`, `gmake` must be used.  The `makeall.sh` script will do this automatically when building on OpenBSD.
+
 ### Build
 Go into the `Toolchain/` directory and run the **BuildIt.sh** script.
 

Kernel/build-image-qemu.sh

@@ -10,7 +10,7 @@ die() {
 if [ "$(id -u)" != 0 ]; then
     die "this script needs to run as root"
 fi
-if [ "$(uname)" = "Darwin" ]; then
+if [ "$(uname -s)" = "Darwin" ]; then
     export PATH="/usr/local/opt/e2fsprogs/bin:$PATH"
     export PATH="/usr/local/opt/e2fsprogs/sbin:$PATH"
 fi
@@ -20,13 +20,21 @@ chown "$build_user":"$build_group" _disk_image || die "couldn't adjust permissio
 echo "done"
 
 printf "creating new filesystem... "
-mke2fs -q -I 128 _disk_image || die "couldn't create filesystem"
+if [ "$(uname -s)" = "OpenBSD" ]; then
+    VND=`vnconfig _disk_image`
+    (echo "e 0"; echo 83; echo n; echo 0; echo "*"; echo "quit") | fdisk -e $VND
+    mkfs.ext2 -I 128 -F /dev/${VND}i || die "couldn't create filesystem"
+else
+    mke2fs -q -I 128 _disk_image || die "couldn't create filesystem"
+fi
 echo "done"
 
 printf "mounting filesystem... "
 mkdir -p mnt
-if [ "$(uname)" = "Darwin" ]; then
+if [ "$(uname -s)" = "Darwin" ]; then
     fuse-ext2 _disk_image mnt -o rw+,allow_other,uid=501,gid=20 || die "couldn't mount filesystem"
+elif [ "$(uname -s)" = "OpenBSD" ]; then
+    mount -t ext2fs /dev/${VND}i mnt/ || die "couldn't mount filesystem"
 else
     mount _disk_image mnt/ || die "couldn't mount filesystem"
 fi
@@ -37,6 +45,9 @@ cleanup() {
         printf "unmounting filesystem... "
         umount mnt || ( sleep 1 && sync && umount mnt )
         rm -rf mnt
+        if [ "$(uname -s)" = "OpenBSD" ]; then
+           vnconfig -u $VND
+        fi
         echo "done"
     fi
 }

Kernel/build-root-filesystem.sh

@@ -77,10 +77,12 @@ echo "done"
 
 printf "installing userland... "
 
-if [ "$(uname)" != "Darwin" ]; then
-find ../Userland/ -type f -executable -exec cp {} mnt/bin/ \;
+if [ "$(uname -s)" = "Darwin" ]; then
+    find ../Userland/ -type f -perm +111 -exec cp {} mnt/bin/ \;
+elif [ "$(uname -s)" = "OpenBSD" ]; then
+    find ../Userland/ -type f -perm -555 -exec cp {} mnt/bin/ \;
 else
-find ../Userland/ -type f -perm +111 -exec cp {} mnt/bin/ \;
+    find ../Userland/ -type f -executable -exec cp {} mnt/bin/ \;
 fi
 chmod 4755 mnt/bin/su
 chmod 4755 mnt/bin/ping

Kernel/makeall.sh

@@ -12,8 +12,14 @@ export build_group
 
 sudo id
 
-make -C ../ clean && \
-    make -C ../ && \
-    make -C ../ test && \
-    make -C ../ install &&
+MAKE=make
+
+if [ "$(uname -s)" = "OpenBSD" ]; then
+	MAKE=gmake
+fi
+
+$MAKE -C ../ clean && \
+    $MAKE -C ../ && \
+    $MAKE -C ../ test && \
+    $MAKE -C ../ install &&
     sudo -E PATH="$PATH" ./build-image-qemu.sh

Libraries/LibC/limits.h

@@ -2,7 +2,9 @@
 
 #include <bits/stdint.h>
 
+#ifndef PAGE_SIZE
 #define PAGE_SIZE 4096
+#endif
 
 #define PATH_MAX 4096
 #if !defined MAXPATHLEN && defined PATH_MAX

Makefile.common

@@ -23,6 +23,11 @@ INCLUDE_FLAGS += \
 VERBOSE = 0
 
 ifneq ($(USE_HOST_CXX),)
+    UNAME_S := $(shell uname -s)
+    ifeq ($(UNAME_S),OpenBSD)
+        HOST_CXX ?= clang++
+    endif
+
     ifeq '' '$(findstring clang++,$(CXX))'
         C_WARNING_FLAGS += -Wno-unknown-warning-option
         CXX_WARNING_FLAGS += -Wno-unknown-warning-option

Toolchain/BuildIt.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 
 # This file will need to be run in bash, for now.
@@ -12,6 +12,20 @@ TARGET="$ARCH-pc-serenity"
 PREFIX="$DIR/Local"
 SYSROOT="$DIR/../Root"
 
+MAKE=make
+MD5SUM=md5sum
+NPROC=nproc
+
+if [ `uname -s` = "OpenBSD" ]; then
+    MAKE=gmake
+    MD5SUM="md5 -q"
+    NPROC="sysctl -n hw.ncpuonline"
+    export CC=egcc
+    export CXX=eg++
+    export with_gmp=/usr/local
+    export LDFLAGS=-Wl,-z,notext
+fi
+
 echo PREFIX is "$PREFIX"
 echo SYSROOT is "$SYSROOT"
 
@@ -30,7 +44,7 @@ GCC_PKG="${GCC_NAME}.tar.gz"
 GCC_BASE_URL="http://ftp.gnu.org/gnu/gcc"
 
 pushd "$DIR/Tarballs"
-    md5="$(md5sum $BINUTILS_PKG | cut -f1 -d' ')"
+    md5="$($MD5SUM $BINUTILS_PKG | cut -f1 -d' ')"
     echo "bu md5='$md5'"
     if [ ! -e $BINUTILS_PKG ] || [ "$md5" != ${BINUTILS_MD5SUM} ] ; then
         rm -f $BINUTILS_PKG
@@ -39,7 +53,7 @@ pushd "$DIR/Tarballs"
         echo "Skipped downloading binutils"
     fi
 
-    md5="$(md5sum ${GCC_PKG} | cut -f1 -d' ')"
+    md5="$($MD5SUM ${GCC_PKG} | cut -f1 -d' ')"
     echo "gc md5='$md5'"
     if [ ! -e $GCC_PKG ] || [ "$md5" != ${GCC_MD5SUM} ] ; then
         rm -f $GCC_PKG
@@ -50,7 +64,7 @@ pushd "$DIR/Tarballs"
 
     if [ ! -d ${BINUTILS_NAME} ]; then
         echo "Extracting binutils..."
-        tar -xf ${BINUTILS_PKG}
+        tar -xzf ${BINUTILS_PKG}
 
         pushd ${BINUTILS_NAME}
             git init >/dev/null
@@ -64,7 +78,7 @@ pushd "$DIR/Tarballs"
 
     if [ ! -d $GCC_NAME ]; then
         echo "Extracting gcc..."
-        tar -xf $GCC_PKG
+        tar -xzf $GCC_PKG
 
         pushd $GCC_NAME
             git init >/dev/null
@@ -90,7 +104,7 @@ mkdir -p "$DIR/Build/binutils"
 mkdir -p "$DIR/Build/gcc"
 
 if [ -z "$MAKEJOBS" ]; then
-    MAKEJOBS=$(nproc)
+    MAKEJOBS=$($NPROC)
 fi
 
 pushd "$DIR/Build/"
@@ -106,16 +120,20 @@ pushd "$DIR/Build/"
             # under macOS generated makefiles are not resolving the "intl"
             # dependency properly to allow linking its own copy of
             # libintl when building with --enable-shared.
-            make -j "$MAKEJOBS" || true
+            "$MAKE" -j "$MAKEJOBS" || true
             pushd intl
-            make all-yes
+            "$MAKE" all-yes
             popd
         fi
-        make -j "$MAKEJOBS" || exit 1
-        make install || exit 1
+        "$MAKE" -j "$MAKEJOBS" || exit 1
+        "$MAKE" install || exit 1
     popd
 
     pushd gcc
+        if [ `uname -s` = "OpenBSD" ]; then
+            perl -pi -e 's/-no-pie/-nopie/g' "$DIR"/Tarballs/gcc-9.2.0/gcc/configure
+        fi
+
         "$DIR"/Tarballs/gcc-9.2.0/configure --prefix="$PREFIX" \
                                             --target="$TARGET" \
                                             --with-sysroot="$SYSROOT" \
@@ -125,18 +143,22 @@ pushd "$DIR/Build/"
                                             --enable-languages=c,c++ || exit 1
 
         echo "XXX build gcc and libgcc"
-        make -j "$MAKEJOBS" all-gcc all-target-libgcc || exit 1
+        "$MAKE" -j "$MAKEJOBS" all-gcc all-target-libgcc || exit 1
         echo "XXX install gcc and libgcc"
-        make install-gcc install-target-libgcc || exit 1
+        "$MAKE" install-gcc install-target-libgcc || exit 1
 
         echo "XXX serenity libc and libm"
-        ( cd "$DIR/../Libraries/LibC/" && make clean && make && make install )
-        ( cd "$DIR/../Libraries/LibM/" && make clean && make && make install )
+        ( cd "$DIR/../Libraries/LibC/" && "$MAKE" clean && "$MAKE" && "$MAKE" install )
+        ( cd "$DIR/../Libraries/LibM/" && "$MAKE" clean && "$MAKE" && "$MAKE" install )
 
         echo "XXX build libstdc++"
-        make all-target-libstdc++-v3 || exit 1 
+        "$MAKE" all-target-libstdc++-v3 || exit 1
         echo "XXX install libstdc++"
-        make install-target-libstdc++-v3 || exit 1
+        "$MAKE" install-target-libstdc++-v3 || exit 1
+
+        if [ `uname -s` = "OpenBSD" ]; then
+            cd "$DIR"/Local/libexec/gcc/i686-pc-serenity/9.2.0 && ln -sf liblto_plugin.so.0.0 liblto_plugin.so
+        fi
     popd
 popd