* Makefile.in (WARN_CFLAGS): Get it from configure.

	(WERROR_CFLAGS): New.
	(INTERNAL_CFLAGS): Add WERROR_CFLAGS.
	* configure.ac: Introduce --enable-werror, which adds -Werror to
	the compiler command line.  Enabled by default.  Disable with
	--disable-werror.  Add -Wdeclaration-after-statement
	Wpointer-arith and -Wformat-nonliteral to warning flags.
        * configure: Regenerate.

1 files changed, 69 insertions, 0 deletions

diff --git a/gdb/gdbserver/configure b/gdb/gdbserver/configure
index 3a8033a2035..1667d14bb06 100755
--- a/gdb/gdbserver/configure
+++ b/gdb/gdbserver/configure
@@ -601,6 +601,8 @@ RDYNAMIC
 REPORT_BUGS_TEXI
 REPORT_BUGS_TO
 PKGVERSION
+WERROR_CFLAGS
+WARN_CFLAGS
 ustinc
 ustlibs
 LIBOBJS
@@ -673,6 +675,7 @@ enable_option_checking
 with_ust
 with_ust_include
 with_ust_lib
+enable_werror
 with_pkgversion
 with_bugurl
 with_libthread_db
@@ -1300,6 +1303,12 @@ if test -n "$ac_init_help"; then
 
   cat <<\_ACEOF
 
+Optional Features:
+  --disable-option-checking  ignore unrecognized --enable/--with options
+  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
+  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
+  --enable-werror         treat compile warnings as errors
+
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
   --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
@@ -3914,6 +3923,66 @@ fi
 
 
 
+# Check whether --enable-werror was given.
+if test "${enable_werror+set}" = set; then :
+  enableval=$enable_werror; case "${enableval}" in
+     yes | y) ERROR_ON_WARNING="yes" ;;
+     no | n)  ERROR_ON_WARNING="no" ;;
+     *) as_fn_error "bad value ${enableval} for --enable-werror" "$LINENO" 5 ;;
+   esac
+fi
+
+
+# Enable -Werror by default when using gcc
+if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" ; then
+    ERROR_ON_WARNING=yes
+fi
+
+WERROR_CFLAGS=""
+if test "${ERROR_ON_WARNING}" = yes ; then
+    WERROR_CFLAGS="-Werror"
+fi
+
+build_warnings="-Wall -Wdeclaration-after-statement -Wpointer-arith \
+-Wformat-nonliteral "
+
+WARN_CFLAGS=""
+if test "x$GCC" = xyes
+then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking compiler warning flags" >&5
+$as_echo_n "checking compiler warning flags... " >&6; }
+    # Separate out the -Werror flag as some files just cannot be
+    # compiled with it enabled.
+    for w in ${build_warnings}; do
+	case $w in
+	-Werr*) WERROR_CFLAGS=-Werror ;;
+	*) # Check that GCC accepts it
+	    saved_CFLAGS="$CFLAGS"
+	    CFLAGS="$CFLAGS $w"
+	    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  WARN_CFLAGS="${WARN_CFLAGS} $w"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+	    CFLAGS="$saved_CFLAGS"
+	esac
+    done
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: ${WARN_CFLAGS} ${WERROR_CFLAGS}" >&5
+$as_echo "${WARN_CFLAGS} ${WERROR_CFLAGS}" >&6; }
+fi
+
+
+
 old_LIBS="$LIBS"
 LIBS="$LIBS -ldl"
 for ac_func in dladdr