Merge GDB 7.5.1

sim/common/acinclude.m4

Index: sim/common/acinclude.m4
diff --git a/sim/common/acinclude.m4 b/sim/common/acinclude.m4
index efb1a29c14e14371c6178f80110c94e2de093734..fe0a5b728746f2e175a5e3d00f9d3c14ba17a58d 100644
--- a/sim/common/acinclude.m4
+++ b/sim/common/acinclude.m4
@@ -29,6 +29,7 @@ AC_REQUIRE([AC_PROG_CC])
 # autoconf.info says this should be called right after AC_INIT.
 AC_CONFIG_HEADER(ifelse([$1],,config.h,[$1]):config.in)
 AC_CANONICAL_SYSTEM
+AC_USE_SYSTEM_EXTENSIONS
 AC_ARG_PROGRAM
 AC_PROG_INSTALL
 
@@ -46,6 +47,13 @@ AR=${AR-ar}
 AC_SUBST(AR)
 AC_PROG_RANLIB
 
+# Some of the common include files depend on bfd.h, and bfd.h checks
+# that config.h is included first by testing that the PACKAGE macro
+# is defined.
+PACKAGE=sim
+AC_DEFINE_UNQUOTED(PACKAGE, "$PACKAGE", [Name of this package. ])
+AC_SUBST(PACKAGE)
+
 # Dependency checking.
 ZW_CREATE_DEPDIR
 ZW_PROG_COMPILER_DEPENDENCIES([CC])
@@ -178,7 +186,7 @@ AC_ARG_ENABLE(sim-trace,
   no)	sim_trace="-DTRACE=0 -DWITH_TRACE=0";;
   [[-0-9]]*)
 	sim_trace="-DTRACE='(${enableval})' -DWITH_TRACE='(${enableval})'";;
-  [[a-z]]*)
+  [[[:lower:]]]*)
 	sim_trace=""
 	for x in `echo "$enableval" | sed -e "s/,/ /g"`; do
 	  if test x"$sim_trace" = x; then
@@ -816,31 +824,44 @@ dnl --enable-build-warnings is for developers of the simulator.
 dnl it enables extra GCC specific warnings.
 AC_DEFUN([SIM_AC_OPTION_WARNINGS],
 [
-# NOTE: Don't add -Wall or -Wunused, they both include
-# -Wunused-parameter which reports bogus warnings.
-# NOTE: If you add to this list, remember to update
-# gdb/doc/gdbint.texinfo.
-build_warnings="-Wimplicit -Wreturn-type -Wcomment -Wtrigraphs \
--Wformat -Wparentheses -Wpointer-arith"
-# GCC supports -Wuninitialized only with -O or -On, n != 0.
-if test x${CFLAGS+set} = xset; then
-  case "${CFLAGS}" in
-    *"-O0"* ) ;;
-    *"-O"* )
-      build_warnings="${build_warnings} -Wuninitialized"
-    ;;
-  esac
-else
-  build_warnings="${build_warnings} -Wuninitialized"
+AC_ARG_ENABLE(werror,
+  AS_HELP_STRING([--enable-werror], [treat compile warnings as errors]),
+  [case "${enableval}" in
+     yes | y) ERROR_ON_WARNING="yes" ;;
+     no | n)  ERROR_ON_WARNING="no" ;;
+     *) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;;
+   esac])
+
+# Enable -Werror by default when using gcc
+if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" ; then
+    ERROR_ON_WARNING=yes
 fi
-# Up for debate: -Wswitch -Wcomment -trigraphs -Wtrigraphs
-# -Wunused-function -Wunused-label -Wunused-variable -Wunused-value
-# -Wchar-subscripts -Wtraditional -Wshadow -Wcast-qual
-# -Wcast-align -Wwrite-strings -Wconversion -Wstrict-prototypes
-# -Wmissing-prototypes -Wmissing-declarations -Wredundant-decls
-# -Woverloaded-virtual -Winline -Werror"
+
+WERROR_CFLAGS=""
+if test "${ERROR_ON_WARNING}" = yes ; then
+# NOTE: Disabled in the sim dir due to most sims generating warnings.
+#    WERROR_CFLAGS="-Werror"
+     true
+fi
+
+# The entries after -Wno-pointer-sign are disabled warnings which may
+# be enabled in the future, which can not currently be used to build
+# GDB.
+# NOTE: If you change this list, remember to update
+# gdb/doc/gdbint.texinfo.
+build_warnings="-Wall -Wdeclaration-after-statement -Wpointer-arith \
+-Wformat-nonliteral -Wno-pointer-sign \
+-Wno-unused -Wunused-value -Wunused-function \
+-Wno-switch -Wno-char-subscripts -Wmissing-prototypes"
+
+# Enable -Wno-format by default when using gcc on mingw since many
+# GCC versions complain about %I64.
+case "${host}" in
+  *-*-mingw32*) build_warnings="$build_warnings -Wno-format" ;;
+esac
+
 AC_ARG_ENABLE(build-warnings,
-[  --enable-build-warnings Enable build-time compiler warnings if gcc is used],
+AS_HELP_STRING([--enable-build-warnings], [enable build-time compiler warnings if gcc is used]),
 [case "${enableval}" in
   yes)	;;
   no)	build_warnings="-w";;
@@ -854,7 +875,7 @@ if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
   echo "Setting compiler warning flags = $build_warnings" 6>&1
 fi])dnl
 AC_ARG_ENABLE(sim-build-warnings,
-[  --enable-gdb-build-warnings Enable SIM specific build-time compiler warnings if gcc is used],
+AS_HELP_STRING([--enable-sim-build-warnings], [enable SIM specific build-time compiler warnings if gcc is used]),
 [case "${enableval}" in
   yes)	;;
   no)	build_warnings="-w";;
@@ -868,7 +889,6 @@ if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
   echo "Setting GDB specific compiler warning flags = $build_warnings" 6>&1
 fi])dnl
 WARN_CFLAGS=""
-WERROR_CFLAGS=""
 if test "x${build_warnings}" != x -a "x$GCC" = xyes
 then
     AC_MSG_CHECKING(compiler warning flags)
@@ -884,7 +904,7 @@ then
 	    CFLAGS="$saved_CFLAGS"
 	esac
     done
-    AC_MSG_RESULT(${WARN_CFLAGS}${WERROR_CFLAGS})
+    AC_MSG_RESULT(${WARN_CFLAGS} ${WERROR_CFLAGS})
 fi
 ])
 AC_SUBST(WARN_CFLAGS)