Date:   Wed, 30 Oct 2019 14:04:16 -0700
In-Reply-To: <20191030210419.213407-1-morbo@google.com>
Message-Id: <20191030210419.213407-4-morbo@google.com>
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References: <20191015000411.59740-1-morbo@google.com> <20191030210419.213407-1-morbo@google.com>
Subject: [kvm-unit-tests PATCH v3 3/6] Makefile: use "-Werror" in cc-option
From:   Bill Wendling <morbo@google.com>
To:     kvm@vger.kernel.org, pbonzini@redhat.com, thuth@redhat.com
Cc:     jmattson@google.com, sean.j.christopherson@intel.com,
        Bill Wendling <morbo@google.com>
Content-Type: text/plain; charset="UTF-8"
Sender: kvm-owner@vger.kernel.org
Precedence: bulk

The "cc-option" macro should use "-Werror" to determine if a flag is
supported. Otherwise the test may not return a nonzero result. Also
conditionalize some of the warning flags which aren't supported by
clang.

Signed-off-by: Bill Wendling <morbo@google.com>
---
 Makefile | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/Makefile b/Makefile
index 32414dc..6201c45 100644
--- a/Makefile
+++ b/Makefile
@@ -46,13 +46,13 @@ include $(SRCDIR)/$(TEST_DIR)/Makefile
 # cc-option
 # Usage: OP_CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
 
-cc-option = $(shell if $(CC) $(1) -S -o /dev/null -xc /dev/null \
+cc-option = $(shell if $(CC) -Werror $(1) -S -o /dev/null -xc /dev/null \
               > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 
 COMMON_CFLAGS += -g $(autodepend-flags)
-COMMON_CFLAGS += -Wall -Wwrite-strings -Wclobbered -Wempty-body -Wuninitialized
-COMMON_CFLAGS += -Wignored-qualifiers -Wunused-but-set-parameter
-COMMON_CFLAGS += -Werror
+COMMON_CFLAGS += -Wall -Wwrite-strings -Wempty-body -Wuninitialized
+COMMON_CFLAGS += -Wignored-qualifiers -Werror
+
 frame-pointer-flag=-f$(if $(KEEP_FRAME_POINTER),no-,)omit-frame-pointer
 fomit_frame_pointer := $(call cc-option, $(frame-pointer-flag), "")
 fnostack_protector := $(call cc-option, -fno-stack-protector, "")
@@ -60,16 +60,20 @@ fnostack_protector_all := $(call cc-option, -fno-stack-protector-all, "")
 wno_frame_address := $(call cc-option, -Wno-frame-address, "")
 fno_pic := $(call cc-option, -fno-pic, "")
 no_pie := $(call cc-option, -no-pie, "")
+wclobbered := $(call cc-option, -Wclobbered, "")
+wunused_but_set_parameter := $(call cc-option, -Wunused-but-set-parameter, "")
+
 COMMON_CFLAGS += $(fomit_frame_pointer)
 COMMON_CFLAGS += $(fno_stack_protector)
 COMMON_CFLAGS += $(fno_stack_protector_all)
 COMMON_CFLAGS += $(wno_frame_address)
 COMMON_CFLAGS += $(if $(U32_LONG_FMT),-D__U32_LONG_FMT__,)
 COMMON_CFLAGS += $(fno_pic) $(no_pie)
+COMMON_CFLAGS += $(wclobbered)
+COMMON_CFLAGS += $(wunused_but_set_parameter)
 
 CFLAGS += $(COMMON_CFLAGS)
-CFLAGS += -Wmissing-parameter-type -Wold-style-declaration -Woverride-init
-CFLAGS += -Wmissing-prototypes -Wstrict-prototypes
+CFLAGS += -Woverride-init -Wmissing-prototypes -Wstrict-prototypes
 
 CXXFLAGS += $(COMMON_CFLAGS)
 
-- 
2.24.0.rc1.363.gb1bccd3e3d-goog