adapt build/install/gcc-wrapper systems for dynamic linking support

Makefile

@@ -35,14 +35,15 @@ EMPTY_LIBS = $(EMPTY_LIB_NAMES:%=lib/lib%.a)
 CRT_LIBS = lib/crt1.o lib/crti.o lib/crtn.o
 LIBC_LIBS = lib/libc.a
 ALL_LIBS = $(LIBC_LIBS) $(CRT_LIBS) $(EMPTY_LIBS)
+ALL_LDSO = lib/ld-musl-$(ARCH).so.1
 
 ALL_TOOLS = tools/musl-gcc
 
 -include config.mak
 
-all: $(ALL_LIBS) $(ALL_TOOLS)
+all: $(ALL_LIBS) $(ALL_TOOLS) $(ALL_LDSO)
 
-install: $(ALL_LIBS:lib/%=$(DESTDIR)$(libdir)/%) $(ALL_INCLUDES:include/%=$(DESTDIR)$(includedir)/%) $(ALL_TOOLS:tools/%=$(DESTDIR)$(bindir)/%)
+install: $(ALL_LIBS:lib/%=$(DESTDIR)$(libdir)/%) $(ALL_INCLUDES:include/%=$(DESTDIR)$(includedir)/%) $(ALL_TOOLS:tools/%=$(DESTDIR)$(bindir)/%) $(ALL_LDSO:%=$(DESTDIR)/%) $(ALL_LDSO:%/ld-musl-$(ARCH).so.1=$(DESTDIR)$(libdir)/libc.so)
 
 clean:
 	rm -f crt/*.o
@@ -74,7 +75,7 @@ include/bits/alltypes.h: include/bits/alltypes.h.sh
 %.lo: %.c $(GENH)
 	$(CC) $(CFLAGS) $(INC) $(PIC) -c -o $@ $<
 
-lib/libc.so: $(LOBJS)
+lib/ld-musl-$(ARCH).so.1: $(LOBJS)
 	$(CC) $(LDFLAGS) -o $@ $(LOBJS) -lgcc
 	$(OBJCOPY) --weaken $@
 
@@ -91,15 +92,24 @@ lib/%.o: crt/%.o
 	cp $< $@
 
 tools/musl-gcc: tools/gen-musl-gcc.sh config.mak
-	sh $< "$(prefix)" > $@ || { rm -f $@ ; exit 1 ; }
+	sh $< "$(prefix)" "$(ARCH)" > $@ || { rm -f $@ ; exit 1 ; }
 	chmod +x $@
 
 $(DESTDIR)$(bindir)/%: tools/%
 	install -D $< $@
 
-$(DESTDIR)$(prefix)/%: %
+$(DESTDIR)$(libdir)/%: lib/%
 	install -D -m 644 $< $@
 
+$(DESTDIR)$(includedir)/%: include/%
+	install -D -m 644 $< $@
+
+$(DESTDIR)/lib/ld-musl-$(ARCH).so.1: lib/ld-musl-$(ARCH).so.1
+	install -D -m 755 $< $@
+
+$(DESTDIR)$(libdir)/libc.so: $(DESTDIR)/lib/ld-musl-$(ARCH).so.1
+	echo 'GROUP ( /lib/ld-musl-$(ARCH).so.1 )' > $@
+
 .PRECIOUS: $(CRT_LIBS:lib/%=crt/%)
 
 .PHONY: all clean install

dist/config.mak

@@ -20,5 +20,5 @@ exec_prefix = /usr/local
 # Uncomment for warnings (as errors). Might need tuning to your gcc version.
 #CFLAGS += -Werror -Wall -Wpointer-arith -Wcast-align -Wno-parentheses -Wno-char-subscripts -Wno-uninitialized -Wno-sequence-point -Wno-missing-braces -Wno-unused-value -Wno-overflow -Wno-int-to-pointer-cast
 
-# Uncomment if you want to build a shared library (experimental).
-#LIBC_LIBS += lib/libc.so
+# Uncomment if you want to disable building the shared library.
+#ALL_LDSO =

tools/gen-musl-gcc.sh

 #!/bin/sh
 
-printf '#!/bin/sh\n\nlibc_prefix="%s"\n' "$1"
+printf '#!/bin/sh\n\nlibc_prefix="%s"\narch="%s"\n' "$1" "$2"
 
 cat <<"EOF"
 libc_lib=$libc_prefix/lib
@@ -27,5 +27,6 @@ done
 exec "$0" "$@"
 ' -std=gnu99 -nostdinc -nostdlib \
   -isystem "$libc_inc" -isystem "$gcc_inc" \
-  -Wl,-xxxxxx "$@" -L"$libc_lib" -lc -L"$libgcc" -lgcc -Lxxxxxx -Wl,-nostdlib
+  -Wl,-xxxxxx "$@" -L"$libc_lib" -lc -L"$libgcc" -lgcc -Lxxxxxx \
+  -Wl,-dynamic-linker /lib/ld-musl-"$arch".so.1 -Wl,-nostdlib
 EOF