Merge branch 'userspace_fexec' into 'master'

Userspace fexec

See merge request !255

recipes/bootstrap/recipe.toml

+[source]
+git = "https://gitlab.redox-os.org/redox-os/bootstrap.git"
+
+[build]
+template = "custom"
+script = """
+ARCH="$(echo "${TARGET}" | cut -d - -f1)"
+nasm -o "${COOKBOOK_BUILD}/asm.o" -f elf64 "${COOKBOOK_SOURCE}/src/${ARCH}.asm"
+cargo -Zbuild-std=core,alloc,compiler_builtins -Zbuild-std-features=compiler-builtins-mem rustc --target "${TARGET}" --manifest-path "${COOKBOOK_SOURCE}/Cargo.toml" --release --target-dir "${COOKBOOK_BUILD}" -- --emit obj="${COOKBOOK_BUILD}/${TARGET}/release/libbootstrap.a"
+compiler_builtins=`find "${COOKBOOK_BUILD}/x86_64-unknown-redox/release/deps/" -name "*libcompiler_builtins*.rlib"`
+ld -o "${COOKBOOK_STAGE}/bootstrap" --gc-sections -T "${COOKBOOK_SOURCE}/src/${ARCH}.ld" "${COOKBOOK_BUILD}/asm.o" "${COOKBOOK_BUILD}/${TARGET}/release/libbootstrap.a" "${COOKBOOK_SYSROOT}/lib/libc.a" "$compiler_builtins"
+"""
+dependencies = ["relibc"]

recipes/escalated/recipe.toml

+[source]
+git = "https://gitlab.redox-os.org/redox-os/escalated.git"
+
+[build]
+template = "cargo"

recipes/relibc/recipe.toml

+[recipe]
+# TODO: Set git link once userspace_fexec is merged.
+#GIT=https://gitlab.redox-os.org/redox-os/relibc.git
+
+[build]
+template = "custom"
+script = """
+cd "${COOKBOOK_SOURCE}"
+"$REDOX_MAKE" CARGO="env -u CARGO cargo" -j"$($NPROC)" DESTDIR="${COOKBOOK_STAGE}" install
+"""