[binutils-gdb/gdb-8.0-branch] Avoid compilation warning on MinGW in xstrndup

[Eli Zaretskii <eliz at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=ce3dd59c3d6e677bb6bbed432205d3a75476f548

commit ce3dd59c3d6e677bb6bbed432205d3a75476f548
Author: Eli Zaretskii <eliz@gnu.org>
Date:   Wed May 31 09:44:08 2017 +0300

    Avoid compilation warning on MinGW in xstrndup
    
    libiberty/ChangeLog:
    
    2017-05-31  DJ Delorie  <dj@redhat.com>
    
    	* configure.ac (strnlen): Add to AC_CHECK_DECLS.
    	* configure: Likewise.
    	* config.in: Add HACE_DECL_STRNLEN.
    
    (cherry picked from commit 5b4a1ff337973732ff9a5ad9b1cb84d74a7e6185)

Diff:
---
 libiberty/ChangeLog    |  6 ++++++
 libiberty/config.in    |  4 ++++
 libiberty/configure    | 21 +++++++++++++++++++++
 libiberty/configure.ac |  3 ++-
 4 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index 2dd3ca7..4b19fef 100644
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,9 @@
+2017-05-31  DJ Delorie  <dj@redhat.com>
+
+	* configure.ac (strnlen): Add to AC_CHECK_DECLS.
+	* configure: Likewise.
+	* config.in: Add HACE_DECL_STRNLEN.
+
 2017-05-31  Eli Zaretskii  <eliz@gnu.org>
 
 	* waitpid.c (wait) [__MINGW32__]: Define as a macro
diff --git a/libiberty/config.in b/libiberty/config.in
index 1ff50c6..66c78e8 100644
--- a/libiberty/config.in
+++ b/libiberty/config.in
@@ -79,6 +79,10 @@
    don't. */
 #undef HAVE_DECL_SNPRINTF
 
+/* Define to 1 if you have the declaration of `strnlen', and to 0 if you
+   don't. */
+#undef HAVE_DECL_STRNLEN
+
 /* Define to 1 if you have the declaration of `strtol', and to 0 if you don't.
    */
 #undef HAVE_DECL_STRTOL
diff --git a/libiberty/configure b/libiberty/configure
index 8687935..ccadfaa 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -5864,6 +5864,16 @@ fi
 cat >>confdefs.h <<_ACEOF
 #define HAVE_DECL_STRTOULL $ac_have_decl
 _ACEOF
+ac_fn_c_check_decl "$LINENO" "strnlen" "ac_cv_have_decl_strnlen" "$ac_includes_default"
+if test "x$ac_cv_have_decl_strnlen" = x""yes; then :
+  ac_have_decl=1
+else
+  ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_STRNLEN $ac_have_decl
+_ACEOF
 
 
 $as_echo "#define HAVE_SYS_ERRLIST 1" >>confdefs.h
@@ -7005,6 +7015,17 @@ cat >>confdefs.h <<_ACEOF
 #define HAVE_DECL_STRVERSCMP $ac_have_decl
 _ACEOF
 
+  ac_fn_c_check_decl "$LINENO" "strnlen" "ac_cv_have_decl_strnlen" "$ac_includes_default"
+if test "x$ac_cv_have_decl_strnlen" = x""yes; then :
+  ac_have_decl=1
+else
+  ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_STRNLEN $ac_have_decl
+_ACEOF
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether canonicalize_file_name must be declared" >&5
 $as_echo_n "checking whether canonicalize_file_name must be declared... " >&6; }
 if test "${libiberty_cv_decl_needed_canonicalize_file_name+set}" = set; then :
diff --git a/libiberty/configure.ac b/libiberty/configure.ac
index 1aa0c7c..6917cfa 100644
--- a/libiberty/configure.ac
+++ b/libiberty/configure.ac
@@ -416,7 +416,7 @@ if test "x" = "y"; then
     table times tmpnam \
     vasprintf vfprintf vprintf vsprintf \
     wait3 wait4 waitpid)
-  AC_CHECK_DECLS([basename(char *), ffs, asprintf, vasprintf, snprintf, vsnprintf, strtol, strtoul, strtoll, strtoull])
+  AC_CHECK_DECLS([basename(char *), ffs, asprintf, vasprintf, snprintf, vsnprintf, strtol, strtoul, strtoll, strtoull, strnlen])
   AC_DEFINE(HAVE_SYS_ERRLIST, 1, [Define if you have the sys_errlist variable.])
   AC_DEFINE(HAVE_SYS_NERR,    1, [Define if you have the sys_nerr variable.])
   AC_DEFINE(HAVE_SYS_SIGLIST, 1, [Define if you have the sys_siglist variable.])
@@ -689,6 +689,7 @@ if test -z "${setobjs}"; then
   AC_CHECK_DECLS([calloc, getenv, getopt, malloc, realloc, sbrk])
   AC_CHECK_DECLS([strtol, strtoul, strtoll, strtoull])
   AC_CHECK_DECLS([strverscmp])
+  AC_CHECK_DECLS([strnlen])
   libiberty_NEED_DECLARATION(canonicalize_file_name)
 fi