- make libcrypt optional. Untested.

Makefile.in

@@ -278,6 +278,10 @@ ifneq ($(UCLIBC_HAS_SOCKET),y)
 	$(RM) $(PREFIX)$(DEVEL_PREFIX)include/bits/socket.h
 	$(RM) $(PREFIX)$(DEVEL_PREFIX)include/sys/socketvar.h
 endif
+ifneq ($(UCLIBC_HAS_CRYPT),y)
+	# Remove crypt.h since libcrypt was disabled upon request
+	$(RM) $(PREFIX)$(DEVEL_PREFIX)include/crypt.h
+endif
 
 # Installs development library links.
 install_dev: install_headers

extra/Configs/Config.in

@@ -910,6 +910,26 @@ config UCLIBC_HAS_PROFILING
 	  gcc's -finstrument-functions needs these.
 
 	  Most people can safely answer N.
+
+config UCLIBC_HAS_CRYPT_IMPL
+	bool "libcrypt support"
+	default y
+	help
+	  libcrypt contains crypt(), setkey() and encrypt()
+
+config UCLIBC_HAS_CRYPT_STUB
+	bool "libcrypt stubs"
+	default y
+	depends on !UCLIBC_HAS_CRYPT_IMPL
+	help
+	  Standards mandate that crypt(3) provides a stub if it is unavailable.
+	  If you enable this option then stubs for
+	    crypt(), setkey() and encrypt()
+	  will be provided in a small libcrypt.
+
+config UCLIBC_HAS_CRYPT
+	def_bool y
+	depends on UCLIBC_HAS_CRYPT_IMPL || UCLIBC_HAS_CRYPT_STUB
 endmenu
 
 menuconfig UCLIBC_HAS_NETWORK_SUPPORT

include/crypt.h

@@ -27,14 +27,15 @@ __BEGIN_DECLS
 
 /* Encrypt characters from KEY using salt to perturb the encryption method.
  * If salt begins with "$1$", MD5 hashing is used instead of DES. */
-extern char *crypt (const char *__key, const char *__salt);
+extern char *crypt (const char *__key, const char *__salt)
+     __THROW __nonnull ((1, 2));
 
 /* Setup DES tables according KEY.  */
-extern void setkey (const char *__key);
+extern void setkey (const char *__key) __THROW __nonnull ((1));
 
 /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
    block in place.  */
-extern void encrypt (char *__block, int __edflag);
+extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1));
 
 __END_DECLS
 

include/stdlib.h

@@ -802,8 +802,10 @@ extern int getsubopt (char **__restrict __optionp,
 
 
 #ifdef __USE_XOPEN
+# if defined __UCLIBC_HAS_CRYPT__
 /* Setup DES tables according KEY.  */
 extern void setkey (__const char *__key) __THROW __nonnull ((1));
+# endif /* __UCLIBC_HAS_CRYPT__ */
 #endif
 
 

include/unistd.h

@@ -1077,6 +1077,7 @@ extern int fdatasync (int __fildes) __THROW;
 /* XPG4.2 specifies that prototypes for the encryption functions must
    be defined here.  */
 #ifdef	__USE_XOPEN
+# if defined __UCLIBC_HAS_CRYPT__
 /* Encrypt at most 8 characters from KEY using salt to perturb DES.  */
 extern char *crypt (__const char *__key, __const char *__salt)
      __THROW __nonnull ((1, 2));
@@ -1084,6 +1085,7 @@ extern char *crypt (__const char *__key, __const char *__salt)
 /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
    block in place.  */
 extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1));
+# endif /* __UCLIBC_HAS_CRYPT__ */
 
 
 /* Swab pairs bytes in the first N bytes of the area pointed to by

libcrypt/Makefile.in

@@ -16,7 +16,14 @@ libcrypt_FULL_NAME := libcrypt-$(VERSION).so
 libcrypt_DIR := $(top_srcdir)libcrypt
 libcrypt_OUT := $(top_builddir)libcrypt
 
-libcrypt_SRC := $(wildcard $(libcrypt_DIR)/*.c)
+ifeq ($(UCLIBC_HAS_CRYPT_IMPL),y)
+CSRC := crypt.c des.c md5.c
+endif
+ifeq ($(UCLIBC_HAS_CRYPT_STUB),y)
+CSRC := crypt_stub.c
+endif
+
+libcrypt_SRC := $(addprefix $(libcrypt_DIR)/,$(CSRC))
 libcrypt_OBJ := $(patsubst $(libcrypt_DIR)/%.c,$(libcrypt_OUT)/%.o,$(libcrypt_SRC))
 
 ifeq ($(DOPIC),y)
@@ -26,8 +33,10 @@ libcrypt-a-y := $(libcrypt_OBJ)
 endif
 libcrypt-so-y := $(libcrypt_OBJ:.o=.os)
 
+ifeq ($(UCLIBC_HAS_CRYPT),y)
 lib-a-y += $(top_builddir)lib/libcrypt.a
 lib-so-y += $(top_builddir)lib/libcrypt.so
+endif
 objclean-y += libcrypt_clean
 
 ifeq ($(DOMULTI),n)

libcrypt/crypt_stub.c

@@ -0,0 +1,30 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * crypt() for uClibc
+ * Copyright (C) 2008 by Erik Andersen <andersen@uclibc.org>
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#define __FORCE_GLIBC
+#include <crypt.h>
+#include <unistd.h>
+#include "libcrypt.h"
+#include <syscall.h>
+
+char *crypt(const char *key attribute_unused, const char *salt attribute_unused)
+{
+	__set_errno(ENOSYS);
+	return NULL;
+}
+
+void
+setkey(const char *key attribute_unused)
+{
+	__set_errno(ENOSYS);
+}
+
+void
+encrypt(char *block attribute_unused, int flag attribute_unused)
+{
+	__set_errno(ENOSYS);
+}