[PATCH] target: missing -Whardened with -fcf-protection=none [PR114606]

[Marek Polacek]

Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?

-- >8 --
-Whardened warns when -fhardened couldn't enable a hardening option
because that option was disabled on the command line, e.g.:

$ ./cc1plus -quiet g.C -fhardened -O2 -fstack-protector
cc1plus: warning: '-fstack-protector-strong' is not enabled by '-fhardened' 
because it was specified on the command line [-Whardened]

but it doesn't work as expected with -fcf-protection=none:

$ ./cc1plus -quiet g.C -fhardened -O2 -fcf-protection=none

because we're checking == CF_NONE which doesn't distinguish between nothing
and -fcf-protection=none.  I should have used OPTION_SET_P, like below.

        PR target/114606

gcc/ChangeLog:

        * config/i386/i386-options.cc (ix86_option_override_internal): Use
        OPTION_SET_P rather than checking == CF_NONE.

gcc/testsuite/ChangeLog:

        * gcc.target/i386/fhardened-1.c: New test.
        * gcc.target/i386/fhardened-2.c: New test.
---
 gcc/config/i386/i386-options.cc             | 2 +-
 gcc/testsuite/gcc.target/i386/fhardened-1.c | 8 ++++++++
 gcc/testsuite/gcc.target/i386/fhardened-2.c | 8 ++++++++
 3 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.target/i386/fhardened-1.c
 create mode 100644 gcc/testsuite/gcc.target/i386/fhardened-2.c

diff --git a/gcc/config/i386/i386-options.cc b/gcc/config/i386/i386-options.cc
index 7896d576977..20c6dc48090 100644
--- a/gcc/config/i386/i386-options.cc
+++ b/gcc/config/i386/i386-options.cc
@@ -3242,7 +3242,7 @@ ix86_option_override_internal (bool main_args_p,
      on the command line.  */
   if (opts->x_flag_hardened && cf_okay_p)
     {
-      if (opts->x_flag_cf_protection == CF_NONE)
+      if (!OPTION_SET_P (flag_cf_protection))
        opts->x_flag_cf_protection = CF_FULL;
       else if (opts->x_flag_cf_protection != CF_FULL)
        warning_at (UNKNOWN_LOCATION, OPT_Whardened,
diff --git a/gcc/testsuite/gcc.target/i386/fhardened-1.c 
b/gcc/testsuite/gcc.target/i386/fhardened-1.c
new file mode 100644
index 00000000000..55d1718ff55
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/fhardened-1.c
@@ -0,0 +1,8 @@
+/* PR target/114606 */
+/* { dg-options "-fhardened -O2 -fcf-protection=none" } */
+
+#ifdef __CET__
+# error "-fcf-protection enabled when it should not be"
+#endif
+
+/* { dg-warning ".-fcf-protection=full. is not enabled by .-fhardened. because 
it was specified" "" { target *-*-* } 0 } */
diff --git a/gcc/testsuite/gcc.target/i386/fhardened-2.c 
b/gcc/testsuite/gcc.target/i386/fhardened-2.c
new file mode 100644
index 00000000000..9b8c1381c19
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/fhardened-2.c
@@ -0,0 +1,8 @@
+/* PR target/114606 */
+/* { dg-options "-fhardened -O2" } */
+
+#if __CET__ != 3
+# error "-fcf-protection not enabled"
+#endif
+
+/* { dg-bogus ".-fcf-protection=full. is not enabled by .-fhardened. because 
it was specified" "" { target *-*-* } 0 } */

base-commit: e7d015b2506a1d9e84d9f7182e42e097147527e1
-- 
2.44.0