cygwin: add LFS_CFLAGS etc. to confstr/getconf

These are used, for instance, when cross-compiling the Linux kernel.

Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>

newlib/libc/include/sys/unistd.h

@@ -582,6 +582,10 @@ int	_EXFUN(unlinkat, (int, const char *, int));
 #define _CS_POSIX_V7_THREADS_LDFLAGS          19
 #define _CS_V7_ENV                            20
 #define _CS_V6_ENV                            _CS_V7_ENV
+#define _CS_LFS_CFLAGS                        21
+#define _CS_LFS_LDFLAGS                       22
+#define _CS_LFS_LIBS                          23
+#define _CS_LFS_LINTFLAGS                     24
 #endif
 
 #ifdef __cplusplus

winsup/cygwin/sysconf.cc

@@ -719,10 +719,14 @@ static struct
   {ls ("")},				/* _CS_POSIX_V7_THREADS_CFLAGS */
   {ls ("")},				/* _CS_POSIX_V7_THREADS_LDFLAGS */
   {ls ("POSIXLY_CORRECT=1")},		/* _CS_V7_ENV */
+  {ls ("")},				/* _CS_LFS_CFLAGS */
+  {ls ("")},				/* _CS_LFS_LDFLAGS */
+  {ls ("")},				/* _CS_LFS_LIBS */
+  {ls ("")},				/* _CS_LFS_LINTFLAGS */
 };
 
 #define CS_MIN _CS_PATH
-#define CS_MAX _CS_V7_ENV
+#define CS_MAX _CS_LFS_LINTFLAGS
 
 extern "C" size_t
 confstr (int in, char *buf, size_t len)

winsup/utils/getconf.c

@@ -97,6 +97,10 @@ static const struct conf_variable conf_table[] =
   { "XBS5_WIDTH_RESTRICTED_ENVS",	CONFSTR,	_CS_XBS5_WIDTH_RESTRICTED_ENVS	},
   { "V7_ENV",				CONFSTR,	_CS_V7_ENV	},
   { "V6_ENV",				CONFSTR,	_CS_V6_ENV	},
+  { "LFS_CFLAGS",			CONFSTR,	_CS_LFS_CFLAGS	},
+  { "LFS_LDFLAGS",			CONFSTR,	_CS_LFS_LDFLAGS	},
+  { "LFS_LIBS",				CONFSTR,	_CS_LFS_LIBS	},
+  { "LFS_LINTFLAGS",			CONFSTR,	_CS_LFS_LINTFLAGS	},
 
   /* Symbolic constants from <limits.h> */
   { "_POSIX_AIO_LISTIO_MAX",		CONSTANT,	_POSIX_AIO_LISTIO_MAX	},