From: Tom Tromey <tom@tromey.com>
To: gdb-patches@sourceware.org
Cc: Tom Tromey <tom@tromey.com>
Subject: [RFA v2 13/13] Add -Wunused-variable to warnings.m4
Date: Sat, 21 Jul 2018 18:47:00 -0000 [thread overview]
Message-ID: <20180721184720.3263-14-tom@tromey.com> (raw)
In-Reply-To: <20180721184720.3263-1-tom@tromey.com>
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
2018-07-21 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
2018-07-21 Tom Tromey <tom@tromey.com>
* configure: Rebuild.
---
gdb/ChangeLog | 7 +++++++
gdb/configure | 28 ++++++++++++++++++++++++++--
gdb/gdbserver/ChangeLog | 4 ++++
gdb/gdbserver/configure | 28 ++++++++++++++++++++++++++--
gdb/warning.m4 | 17 +++++++++++++++--
5 files changed, 78 insertions(+), 6 deletions(-)
diff --git a/gdb/configure b/gdb/configure
index 3f0a22073d0..3ee88e4eb39 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -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
diff --git a/gdb/gdbserver/configure b/gdb/gdbserver/configure
index 6064a1eb10f..043bc216e43 100755
--- a/gdb/gdbserver/configure
+++ b/gdb/gdbserver/configure
@@ -7237,7 +7237,7 @@ 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 \
@@ -7326,7 +7326,30 @@ $as_echo_n "checking compiler warning flags... " >&6; }
CFLAGS="$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
@@ -7341,6 +7364,7 @@ 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="$saved_CXXFLAGS"
esac
diff --git a/gdb/warning.m4 b/gdb/warning.m4
index 632cc214ac0..00e7cd60508 100644
--- a/gdb/warning.m4
+++ b/gdb/warning.m4
@@ -37,7 +37,7 @@ fi
# The options we'll try to enable.
build_warnings="-Wall -Wpointer-arith \
--Wno-unused -Wunused-value -Wunused-function \
+-Wno-unused -Wunused-value -Wunused-variable -Wunused-function \
-Wno-switch -Wno-char-subscripts \
-Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable \
-Wno-sign-compare -Wno-narrowing -Wno-error=maybe-uninitialized \
@@ -118,7 +118,20 @@ then
CFLAGS="$CFLAGS -Werror $wtest"
saved_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -Werror $wtest"
- AC_TRY_COMPILE([],[],WARN_CFLAGS="${WARN_CFLAGS} $w",)
+ if test "x$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.
+ AC_TRY_COMPILE(
+ [struct scoped_restore_base {};
+ struct scoped_restore_tmpl : public scoped_restore_base {
+ ~scoped_restore_tmpl() {}
+ };],
+ [const scoped_restore_base &b = scoped_restore_tmpl();],
+ WARN_CFLAGS="${WARN_CFLAGS} $w",)
+ else
+ AC_TRY_COMPILE([],[],WARN_CFLAGS="${WARN_CFLAGS} $w",)
+ fi
CFLAGS="$saved_CFLAGS"
CXXFLAGS="$saved_CXXFLAGS"
esac
--
2.13.6
next prev parent reply other threads:[~2018-07-21 18:47 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-21 18:47 [RFA v2 00/13] Add -Wunused-variable Tom Tromey
2018-07-21 18:47 ` [RFA v2 04/13] Use a previously unused variable in bfin-tdep.c Tom Tromey
2018-07-21 18:47 ` [RFA v2 09/13] Pass the correct argument to the observer in reread_symbols Tom Tromey
2018-07-21 18:47 ` [RFA v2 12/13] Conditionally define xmltarget_${name} variable in regdat.sh Tom Tromey
2018-07-21 18:47 ` [RFA v2 03/13] Unused variable fixes related to conditional compilation Tom Tromey
2018-07-21 18:47 ` [RFA v2 02/13] Remove an unused variable from spu_get_overlay_table Tom Tromey
2018-07-22 2:06 ` Simon Marchi
2018-07-22 18:59 ` Ulrich Weigand
2018-07-21 18:47 ` [RFA v2 11/13] Remove unused variables from gdbserver Tom Tromey
2018-07-21 18:47 ` [RFA v2 06/13] Remove dead code from m32c-tdep.c Tom Tromey
2018-07-22 2:10 ` Simon Marchi
2018-07-21 18:47 ` [RFA v2 08/13] Fix ravenscar-thread.c to use arch_ops Tom Tromey
2018-07-21 18:47 ` [RFA v2 10/13] Remove unused declaration from value.c Tom Tromey
2018-07-22 2:13 ` Simon Marchi
2018-07-21 18:47 ` [RFA v2 01/13] Simple unused variable removals Tom Tromey
2018-07-22 2:04 ` Simon Marchi
2018-07-21 18:47 ` [RFA v2 07/13] Call value_fetch_lazy when needed in pretty-printers Tom Tromey
2018-07-21 18:47 ` [RFA v2 05/13] Call some functions in guile/ for effect Tom Tromey
2018-07-21 18:47 ` Tom Tromey [this message]
2018-07-22 2:26 ` [RFA v2 00/13] Add -Wunused-variable Simon Marchi
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