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Message-ID: <ZBJMc24vyL3X9RHa@google.com>
Date: Wed, 15 Mar 2023 15:53:39 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Yu Zhang <yu.c.zhang@...ux.intel.com>
Cc: pbonzini@...hat.com, shuah@...nel.org, kvm@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: selftest: Add dependency rules in makefile for C
source code
On Fri, Jan 27, 2023, Yu Zhang wrote:
> Currently, KVM selftests have to run "make clean && make" to rebuild the
> entire test suite each time a header file is modified. Define "-MD" as
> an EXTRA_CFLAGS, so we can generate the dependency rules for each target
> object, whose prerequisites contains the source file and the included header
> files as well. And including those dependency files in KVM selftests' makefile
> will release us from such annoyance.
>
> Signed-off-by: Yu Zhang <yu.c.zhang@...ux.intel.com>
> ---
> tools/testing/selftests/kvm/Makefile | 21 ++++++++++++++++++---
> 1 file changed, 18 insertions(+), 3 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index 1750f91dd936..b329e0d1a460 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -180,6 +180,8 @@ TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(ARCH_DIR))
> TEST_GEN_PROGS_EXTENDED += $(TEST_GEN_PROGS_EXTENDED_$(ARCH_DIR))
> LIBKVM += $(LIBKVM_$(ARCH_DIR))
>
> +OVERRIDE_TARGETS = 1
> +
> # lib.mak defines $(OUTPUT), prepends $(OUTPUT)/ to $(TEST_GEN_PROGS), and most
> # importantly defines, i.e. overwrites, $(CC) (unless `make -e` or `make CC=`,
> # which causes the environment variable to override the makefile).
> @@ -198,9 +200,11 @@ CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
> -fno-builtin-memcmp -fno-builtin-memcpy -fno-builtin-memset \
> -fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \
> -I$(LINUX_TOOL_ARCH_INCLUDE) -I$(LINUX_HDR_PATH) -Iinclude \
> - -I$(<D) -Iinclude/$(ARCH_DIR) -I ../rseq -I.. $(EXTRA_CFLAGS) \
> + -I$(<D) -Iinclude/$(ARCH_DIR) -I ../rseq -I.. \
> $(KHDR_INCLUDES)
>
> +EXTRA_CFLAGS += -MD
> +
> no-pie-option := $(call try-run, echo 'int main(void) { return 0; }' | \
> $(CC) -Werror $(CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie)
>
> @@ -218,11 +222,22 @@ LIBKVM_S_OBJ := $(patsubst %.S, $(OUTPUT)/%.o, $(LIBKVM_S))
> LIBKVM_STRING_OBJ := $(patsubst %.c, $(OUTPUT)/%.o, $(LIBKVM_STRING))
> LIBKVM_OBJS = $(LIBKVM_C_OBJ) $(LIBKVM_S_OBJ) $(LIBKVM_STRING_OBJ)
>
> -EXTRA_CLEAN += $(LIBKVM_OBJS) cscope.*
> +TEST_GEN_OBJ = $(patsubst %, %.o, $(TEST_GEN_PROGS))
> +TEST_GEN_OBJ += $(patsubst %, %.o, $(TEST_GEN_PROGS_EXTENDED))
> +TEST_DEP_FILES = $(patsubst %.o, %.d, $(TEST_GEN_OBJ))
> +TEST_DEP_FILES += $(patsubst %.o, %.d, $(LIBKVM_OBJS))
> +-include $(TEST_DEP_FILES)
> +
> +$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): %: %.o
> + $(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $< $(LIBKVM_OBJS) $(LDLIBS) -o $@
Do we actually need to omit -MD here? IIUC, it just means that the .d file will
get redundantly generated when building the final executable. I would much prefer
to build everything with the same options unless there's a good reason not to,
e.g. this patch doesn't feed -MD into the LIBKVM_STRING_OBJ target, which seems
wrong.
I.e. why not simply
---
tools/testing/selftests/kvm/Makefile | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 152c1a988e42..faaf65aa7621 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -182,6 +182,8 @@ TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(ARCH_DIR))
TEST_GEN_PROGS_EXTENDED += $(TEST_GEN_PROGS_EXTENDED_$(ARCH_DIR))
LIBKVM += $(LIBKVM_$(ARCH_DIR))
+OVERRIDE_TARGETS = 1
+
# lib.mak defines $(OUTPUT), prepends $(OUTPUT)/ to $(TEST_GEN_PROGS), and most
# importantly defines, i.e. overwrites, $(CC) (unless `make -e` or `make CC=`,
# which causes the environment variable to override the makefile).
@@ -196,7 +198,7 @@ else
LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/$(ARCH)/include
endif
CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
- -Wno-gnu-variable-sized-type-not-at-end \
+ -Wno-gnu-variable-sized-type-not-at-end -MD \
-fno-builtin-memcmp -fno-builtin-memcpy -fno-builtin-memset \
-fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \
-I$(LINUX_TOOL_ARCH_INCLUDE) -I$(LINUX_HDR_PATH) -Iinclude \
@@ -223,7 +225,18 @@ LIBKVM_S_OBJ := $(patsubst %.S, $(OUTPUT)/%.o, $(LIBKVM_S))
LIBKVM_STRING_OBJ := $(patsubst %.c, $(OUTPUT)/%.o, $(LIBKVM_STRING))
LIBKVM_OBJS = $(LIBKVM_C_OBJ) $(LIBKVM_S_OBJ) $(LIBKVM_STRING_OBJ)
-EXTRA_CLEAN += $(LIBKVM_OBJS) cscope.*
+TEST_GEN_OBJ = $(patsubst %, %.o, $(TEST_GEN_PROGS))
+TEST_GEN_OBJ += $(patsubst %, %.o, $(TEST_GEN_PROGS_EXTENDED))
+TEST_DEP_FILES = $(patsubst %.o, %.d, $(TEST_GEN_OBJ))
+TEST_DEP_FILES += $(patsubst %.o, %.d, $(LIBKVM_OBJS))
+-include $(TEST_DEP_FILES)
+
+$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): %: %.o
+ $(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $< $(LIBKVM_OBJS) $(LDLIBS) -o $@
+$(TEST_GEN_OBJ): %.o: %.c
+ $(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
+
+EXTRA_CLEAN += $(LIBKVM_OBJS) $(TEST_DEP_FILES) $(TEST_GEN_OBJ) cscope.*
x := $(shell mkdir -p $(sort $(dir $(LIBKVM_C_OBJ) $(LIBKVM_S_OBJ))))
$(LIBKVM_C_OBJ): $(OUTPUT)/%.o: %.c
base-commit: 95b9779c1758f03cf494e8550d6249a40089ed1c
--
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