Changes are to allow ustr version 1.0.4 to cross compile in buildroot.

Signed-off-by Clayton Shotwell <clshotwe@rockwellcollins.com>

diff -urN a/ustr-compiler.h b/ustr-compiler.h
--- a/ustr-compiler.h	2008-02-15 14:12:28.000000000 -0600
+++ b/ustr-compiler.h	2012-06-15 11:04:55.000000000 -0500
@@ -13,10 +13,10 @@
 
 /* We assume this is enough,
  * C99 specifies that va_copy() exists and is a macro */
-#ifdef va_copy
+#if defined va_copy
 # define USTR_CONF_HAVE_VA_COPY 1
 # define USTR__VA_COPY(x, y)   va_copy(x, y)
-#elif __va_copy
+#elif defined __va_copy
 # define USTR_CONF_HAVE_VA_COPY 1
 # define USTR__VA_COPY(x, y) __va_copy(x, y)
 #else
diff -urN a/Makefile b/Makefile
--- a/Makefile	2008-03-05 21:38:00.000000000 -0600
+++ b/Makefile	2013-09-10 16:54:45.916874387 -0500
@@ -8,8 +8,8 @@
 VERS_ESONAME =1
 VERS_ESO     =$(VERS_ESONAME).0.4
 
-DESTDIR =
-prefix=/usr
+DESTDIR ?= 
+prefix ?= /usr
 datadir=$(prefix)/share
 libdir=$(prefix)/lib
 libexecdir=$(prefix)/libexec
@@ -18,7 +18,7 @@
 SHRDIR=$(datadir)/ustr-$(VERS_FULL)
 DOCSHRDIR=$(datadir)/doc/ustr-devel-$(VERS_FULL)
 EXAMDIR=$(SHRDIR)/examples
-mandir=$(datadir)/doc/man
+mandir=$(datadir)/man
 MBINDIR=$(libexecdir)/ustr-$(VERS_FULL)
 
 ###############################################################################
@@ -28,12 +28,12 @@
 ###############################################################################
 HIDE=@
 
-CC = cc
-AR = ar
-RANLIB = ranlib
-LDCONFIG = /sbin/ldconfig
+CC ?= cc
+AR ?= ar
+RANLIB ?= ranlib
 
-CFLAGS  = -O2 -g
+CFLAGS ?= -O2 -g
+LDFLAGS ?= 
 
 # Debug versions...
 WARNS = -W -Wall -Wundef -Wshadow -Wpointer-arith -Wbad-function-cast -Wcast-align -Wwrite-strings -Waggregate-return -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wnested-externs -Wno-format-zero-length -Wformat-nonliteral -Wformat-security # -Wfloat-equal -- no floats
@@ -376,7 +376,7 @@
 all-shared: all $(LIB_SHARED)
 		$(HIDE)echo Done shared
 
-install: all-shared ustr.pc ustr-debug.pc
+install: all ustr.pc ustr-debug.pc
 		$(HIDE)echo Making directories
 		install -d $(DESTDIR)$(libdir)
 		install -d $(DESTDIR)$(includedir)
@@ -389,16 +389,6 @@
 		install -d $(DESTDIR)$(libdir)/pkgconfig
 		$(HIDE)echo Installing files
 		install -m 644 -t $(DESTDIR)$(libdir) $(LIB_STATIC)
-		install -m 755 -t $(DESTDIR)$(libdir) $(LIB_SHARED)
-		-rm -f $(DESTDIR)$(libdir)/$(OPT_LIB_SHARED_NAME)
-		ln -s $(OPT_LIB_SHARED) $(DESTDIR)$(libdir)/$(OPT_LIB_SHARED_NAME)
-		-rm -f $(DESTDIR)$(libdir)/$(OPT_LIB_SHAREDEV)
-		ln -s $(OPT_LIB_SHARED_NAME) $(DESTDIR)$(libdir)/$(OPT_LIB_SHAREDEV)
-		-rm -f $(DESTDIR)$(libdir)/$(DBG_LIB_SHARED_NAME)
-		ln -s $(DBG_LIB_SHARED) $(DESTDIR)$(libdir)/$(DBG_LIB_SHARED_NAME)
-		-rm -f $(DESTDIR)$(libdir)/$(DBG_LIB_SHAREDEV)
-		ln -s $(DBG_LIB_SHARED_NAME) $(DESTDIR)$(libdir)/$(DBG_LIB_SHAREDEV)
-		$(LDCONFIG) -n $(DESTDIR)$(libdir)
 		install -pm 644 -t $(DESTDIR)$(includedir) $(SRC_HDRS)
 		install -pm 644 -t $(DESTDIR)$(SHRDIR) $(SRC_SRCS)
 		install -pm 644 -t $(DESTDIR)$(SHRDIR) $(XSRC_SRCS)
@@ -409,13 +399,24 @@
 		install -m 755 -t $(DESTDIR)$(bindir) ustr-import
 		install -pm 644 -t $(DESTDIR)$(libdir)/pkgconfig ustr.pc ustr-debug.pc
 
+install-shared: all-shared install
+		$(HIDE)echo Installing files
+		install -m 755 -t $(DESTDIR)$(libdir) $(LIB_SHARED)
+		-rm -f $(DESTDIR)$(libdir)/$(OPT_LIB_SHARED_NAME)
+		ln -s $(OPT_LIB_SHARED) $(DESTDIR)$(libdir)/$(OPT_LIB_SHARED_NAME)
+		-rm -f $(DESTDIR)$(libdir)/$(OPT_LIB_SHAREDEV)
+		ln -s $(OPT_LIB_SHARED_NAME) $(DESTDIR)$(libdir)/$(OPT_LIB_SHAREDEV)
+		-rm -f $(DESTDIR)$(libdir)/$(DBG_LIB_SHARED_NAME)
+		ln -s $(DBG_LIB_SHARED) $(DESTDIR)$(libdir)/$(DBG_LIB_SHARED_NAME)
+		-rm -f $(DESTDIR)$(libdir)/$(DBG_LIB_SHAREDEV)
+		ln -s $(DBG_LIB_SHARED_NAME) $(DESTDIR)$(libdir)/$(DBG_LIB_SHAREDEV)
+
 ustr-import-multilib: ustr-import-multilib.in
 		sed -e 's,@INCLUDEDIR@,$(includedir),g' -e 's,@MBINDIR@,$(MBINDIR),g' < $< > $@
 
 install-multilib-linux: install autoconf_64b ustr-import-multilib
 		install -d $(DESTDIR)$(MBINDIR)
-		$(HIDE)mlib=`./autoconf_64b`; \
-                   if test "x$$mlib" = "x1"; then mlib=64; else mlib=32; fi; \
+		$(HIDE))if test "`echo "__SIZEOF_SIZE_T__" | $(CC) -E -x c - | tail -n 1`" = 8; then mlib=64; else mlib=32; fi; \
                    mv -f $(DESTDIR)$(includedir)/ustr-conf-debug.h \
                          $(DESTDIR)$(includedir)/ustr-conf-debug-$$mlib.h; \
                    mv -f $(DESTDIR)$(includedir)/ustr-conf.h \
@@ -451,7 +452,8 @@
 
 ustr-import: ustr-import.in autoconf_64b autoconf_vsnprintf
 		$(HIDE)echo Creating $@
-		$(HIDE)sz64=`./autoconf_64b`; vsnp=`./autoconf_vsnprintf`; \
+		$(HIDE)if test "`echo "__SIZEOF_SIZE_T__" | $(CC) -E -x c - | tail -n 1`" = 8; then sz64=1; else sz64=0; fi; \
+		if test "`./autoconf_vsnprintf`" = 0; then vsnp=0; else vsnp=1; fi; \
 		sed -e 's,@INCLUDEDIR@,$(includedir),g' -e 's,@SHRDIR@,$(SHRDIR),g' -e 's,@VERS@,$(VERS),g'  -e 's,@VERS_FULL@,$(VERS_FULL),g' -e "s,@HAVE_64bit_SIZE_MAX@,$$sz64,g" -e "s,@HAVE_RETARDED_VSNPRINTF@,$$vsnp,g" < $< > $@
 		$(HIDE)chmod 755 $@
 
@@ -485,7 +487,8 @@
 ustr-conf.h: ustr-conf.h.in autoconf_64b autoconf_vsnprintf
 		$(HIDE)echo Creating $@
 		$(HIDE)have_stdint_h=0; dbg1=0; dbg2=0; \
-                sz64=`./autoconf_64b`; vsnp=`./autoconf_vsnprintf`; \
+                if test "`echo "__SIZEOF_SIZE_T__" | $(CC) -E -x c - | tail -n 1`" = 8; then sz64=1; else sz64=0; fi; \
+                if test "`./autoconf_vsnprintf`" = 0; then vsnp=0; else vsnp=1; fi; \
                 if test -f "/usr/include/stdint.h"; then have_stdint_h=1; fi; \
                 if test -f "$(prefix)/include/stdint.h"; then have_stdint_h=1; fi; \
                 if test -f "$(includedir)/stdint.h"; then have_stdint_h=1; fi; \
@@ -494,7 +497,8 @@
 ustr-conf-debug.h: ustr-conf.h.in autoconf_64b autoconf_vsnprintf
 		$(HIDE)echo Creating $@
 		$(HIDE)have_stdint_h=0; dbg1=1; dbg2=1; \
-                sz64=`./autoconf_64b`; vsnp=`./autoconf_vsnprintf`; \
+                if test "`echo "__SIZEOF_SIZE_T__" | $(CC) -E -x c - | tail -n 1`" = 8; then sz64=1; else sz64=0; fi; \
+                if test "`./autoconf_vsnprintf`" = 0; then vsnp=0; else vsnp=1; fi; \
                 if test -f "/usr/include/stdint.h"; then have_stdint_h=1; fi; \
                 if test -f "$(prefix)/include/stdint.h"; then have_stdint_h=1; fi; \
                 if test -f "$(includedir)/stdint.h"; then have_stdint_h=1; fi; \