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Add -Wunused-variable to warnings.m4

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This adds -Wunused-variable to the build.  This required a special
check in configure in order to work around a bug in GCC 4.9.  Simon
ound the correct test to use, so I've added him to the ChangeLog.

gdb/ChangeLog
2018-07-22  Simon Marchi  <simon.marchi@polymtl.ca>
	    Tom Tromey  <tom@tromey.com>

	* warning.m4 (AM_GDB_WARNINGS): Add -Wunused-variable and special
	test for it.
	* configure: Rebuild.

gdb/gdbserver/ChangeLog
2018-07-22  Tom Tromey  <tom@tromey.com>

	* configure: Rebuild.
This commit is contained in:
Tom Tromey
2018-07-08 21:05:41 -06:00
parent 3b20124b3d
commit a0de763e32
5 changed files with 78 additions and 6 deletions
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28
gdb/configure vendored
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@@ -15439,7 +15439,7 @@ fi
# The options we'll try to enable.
build_warnings="-Wall -Wpointer-arith \
-Wno-unused -Wunused-value -Wunused-function \
-Wno-unused -Wunused-value -Wunused-variable -Wunused-function \
-Wno-switch -Wno-char-subscripts \
-Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable \
-Wno-sign-compare -Wno-narrowing -Wno-error=maybe-uninitialized \
@@ -15528,7 +15528,30 @@ $as_echo_n "checking compiler warning flags... " >&6; }
CFLAGS="$CFLAGS -Werror $wtest"
saved_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -Werror $wtest"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
if test "x$w" = "x-Wunused-variable"; then
# Check for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38958,
# fixed in GCC 4.9. This test is derived from the gdb
# source code that triggered this bug in GCC.
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
struct scoped_restore_base {};
struct scoped_restore_tmpl : public scoped_restore_base {
~scoped_restore_tmpl() {}
};
int
main ()
{
const scoped_restore_base &b = scoped_restore_tmpl();
;
return 0;
}
_ACEOF
if ac_fn_cxx_try_compile "$LINENO"; then :
WARN_CFLAGS="${WARN_CFLAGS} $w"
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
@@ -15543,6 +15566,7 @@ if ac_fn_cxx_try_compile "$LINENO"; then :
WARN_CFLAGS="${WARN_CFLAGS} $w"
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
CFLAGS="$saved_CFLAGS"
CXXFLAGS="$saved_CXXFLAGS"
esac