Avoid warnings due to the use of -Wuninitialized without -O.

* configure.ac (build_warnings): Include -Wuninitialized only if
CFLAGS is unset at configure time, or CFLAGS is set and includes
some -O option other than -O0.
* configure: Regenerated.

1 files changed, 14 insertions, 1 deletions

diff --git a/gdb/configure b/gdb/configure
index d77ab938cb..d6a9e03450 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -19655,8 +19655,21 @@ fi;
 # 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 -Wuninitialized -Wformat-nonliteral \
+-Wformat -Wparentheses -Wpointer-arith -Wformat-nonliteral \
 -Wunused-label -Wunused-function"
+
+# 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"
+fi
+
 # Up for debate: -Wswitch -Wcomment -trigraphs -Wtrigraphs
 # -Wunused-function -Wunused-variable -Wunused-value
 # -Wchar-subscripts -Wtraditional -Wshadow -Wcast-qual