Add linux-relibc target support

Makefile

@@ -94,6 +94,8 @@ install-libs: headers libs
 	cp -v "$(BUILD)/$(PROFILE)/ld.so" "$(DESTDIR)/$(LD_SO_PATH)"
 ifeq ($(USE_RUST_LIBM),)
 	cp -v "$(BUILD)/openlibm/libopenlibm.a" "$(DESTDIR)/lib/libm.a"
+else
+	$(AR) -rcs "$(DESTDIR)/lib/libm.a"
 endif
 	# Empty libraries for dl, pthread, and rt
 	$(AR) -rcs "$(DESTDIR)/lib/libdl.a"

config.mk

@@ -12,6 +12,17 @@ ifeq ($(TARGET),aarch64-unknown-linux-gnu)
 	LD_SO_PATH=lib/ld.so.1
 endif
 
+ifeq ($(TARGET),aarch64-unknown-linux-relibc)
+	export CC=aarch64-linux-relibc-gcc
+	export LD=aarch64-linux-relibc-ld
+	export AR=aarch64-linux-relibc-ar
+	export NM=aarch64-linux-relibc-nm
+	export OBJCOPY=aarch64-linux-relibc-objcopy
+	export CPPFLAGS=
+	LD_SO_PATH=lib/ld.so.1
+endif
+
+
 ifeq ($(TARGET),aarch64-unknown-redox)
 	export CC=aarch64-unknown-redox-gcc
 	export LD=aarch64-unknown-redox-ld
@@ -52,6 +63,16 @@ ifeq ($(TARGET),x86_64-unknown-linux-gnu)
 	LD_SO_PATH=lib/ld64.so.1
 endif
 
+ifeq ($(TARGET),x86_64-unknown-linux-relibc)
+	export CC=x86_64-linux-relibc-gcc
+	export LD=x86_64-linux-relibc-ld
+	export AR=x86_64-linux-relibc-ar
+	export NM=x86_64-linux-relibc-nm
+	export OBJCOPY=x86_64-linux-relibc-objcopy
+	export CPPFLAGS=
+	LD_SO_PATH=lib/ld64.so.1
+endif
+
 ifeq ($(TARGET),x86_64-unknown-redox)
 	export CC=x86_64-unknown-redox-gcc
 	export LD=x86_64-unknown-redox-ld

ld_so/ld_script/aarch64-unknown-linux-relibc.ld

@@ -0,0 +1 @@
+./aarch64-unknown-linux-gnu.ld

ld_so/ld_script/x86_64-unknown-linux-relibc.ld

@@ -0,0 +1 @@
+./x86_64-unknown-linux-gnu.ld