libintl: make it optional and configurable

As rofl0r suggested, libintl.a now comes in two flavours, no-op or musl,
or we could just disable it.

no-op: gettext functions just return the input string as translation and
symbols help to get past configure scripts

musl: symbols as in no-op, with libintl built-in in to recent musl
version

Use LIBINTL=FLAVOR, FLAVOR can be NOOP(no-op), MUSL, NONE(disable)

Author: xhebox

Makefile

@@ -5,19 +5,27 @@ libdir=$(prefix)/lib
 sysconfdir=$(prefix)/etc
 m4dir=$(prefix)/share/gettext-tiny
 
-LIBSRC = $(sort $(wildcard libintl/*.c))
+ifeq ($(LIBINTL), MUSL)
+	LIBSRC = libintl/libintl-musl.c
+	HEADERS =
+else ifeq ($(LIBINTL), NONE)
+	LIBSRC =
+	HEADERS =
+else
+	LIBSRC = libintl/libintl.c
+	HEADERS = libintl.h
+endif
 PROGSRC = $(sort $(wildcard src/*.c))
 
 PARSEROBJS = src/poparser.o src/StringEscape.o
 PROGOBJS = $(PROGSRC:.c=.o)
 LIBOBJS = $(LIBSRC:.c=.o)
 OBJS = $(PROGOBJS) $(LIBOBJS)
 
-
-HEADERS = libintl.h
 ALL_INCLUDES = $(HEADERS)
-
+ifneq ($(LIBINTL), NONE)
 ALL_LIBS=libintl.a
+endif
 ALL_TOOLS=msgfmt msgmerge xgettext autopoint
 ALL_M4S=$(sort $(wildcard m4/*.m4))
 

libintl/libintl-musl.c

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+/* trick configure tests checking for gnu libintl, as in the copy included in gdb */
+const char *_nl_expand_alias () { return NULL; }
+int _nl_msg_cat_cntr = 0;