[PATCH v3 1/3] objtool: Install libsubcmd in build

Ian Rogers
2023-01-05T09:02:16Z

Including from tools/lib can create inadvertent dependencies. Install
libsubcmd in the objtool build and then include the headers from
there.

Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
---
tools/objtool/Build | 2 --
tools/objtool/Makefile | 33 +++++++++++++++++++++++++--------
2 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/tools/objtool/Build b/tools/objtool/Build
index 33f2ee5a46d3..a3cdf8af6635 100644
--- a/tools/objtool/Build
+++ b/tools/objtool/Build
@@ -16,8 +16,6 @@ objtool-y += libctype.o
objtool-y += str_error_r.o
objtool-y += librbtree.o

-CFLAGS += -I$(srctree)/tools/lib
-
$(OUTPUT)libstring.o: ../lib/string.c FORCE
$(call rule_mkdir)
$(call if_changed_dep,cc_o_c)
diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index a3a9cc24e0e3..fd9b3e3113c6 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -12,9 +12,15 @@ srctree := $(patsubst %/,%,$(dir $(CURDIR)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
endif

-SUBCMD_SRCDIR = $(srctree)/tools/lib/subcmd/
-LIBSUBCMD_OUTPUT = $(or $(OUTPUT),$(CURDIR)/)
-LIBSUBCMD = $(LIBSUBCMD_OUTPUT)libsubcmd.a
+LIBSUBCMD_DIR = $(srctree)/tools/lib/subcmd/
+ifneq ($(OUTPUT),)
+ LIBSUBCMD_OUTPUT = $(abspath $(OUTPUT))/libsubcmd
+else
+ LIBSUBCMD_OUTPUT = $(CURDIR)/libsubcmd
+endif
+LIBSUBCMD_DESTDIR = $(LIBSUBCMD_OUTPUT)
+LIBSUBCMD = $(LIBSUBCMD_OUTPUT)/libsubcmd.a
+CFLAGS += -I$(LIBSUBCMD_OUTPUT)/include

OBJTOOL := $(OUTPUT)objtool
OBJTOOL_IN := $(OBJTOOL)-in.o
@@ -28,7 +34,8 @@ INCLUDES := -I$(srctree)/tools/include \
-I$(srctree)/tools/arch/$(HOSTARCH)/include/uapi \
-I$(srctree)/tools/arch/$(SRCARCH)/include \
-I$(srctree)/tools/objtool/include \
- -I$(srctree)/tools/objtool/arch/$(SRCARCH)/include
+ -I$(srctree)/tools/objtool/arch/$(SRCARCH)/include \
+ -I$(LIBSUBCMD_OUTPUT)/include
WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed -Wno-nested-externs
CFLAGS := -Werror $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES) $(LIBELF_FLAGS)
LDFLAGS += $(LIBELF_LIBS) $(LIBSUBCMD) $(KBUILD_HOSTLDFLAGS)
@@ -38,6 +45,7 @@ elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(CC) $(CFLAGS) -x c -E -
CFLAGS += $(if $(elfshdr),,-DLIBELF_USE_DEPRECATED)

AWK = awk
+MKDIR = mkdir

BUILD_ORC := n

@@ -57,13 +65,22 @@ $(OBJTOOL): $(LIBSUBCMD) $(OBJTOOL_IN)
$(QUIET_LINK)$(CC) $(OBJTOOL_IN) $(LDFLAGS) -o $@

-$(LIBSUBCMD): fixdep FORCE
- $(Q)$(MAKE) -C $(SUBCMD_SRCDIR) OUTPUT=$(LIBSUBCMD_OUTPUT)
+$(LIBSUBCMD_OUTPUT):
+ @$(MKDIR) -p $@
+
+$(LIBSUBCMD): fixdep FORCE $(LIBSUBCMD_OUTPUT)
+ @$(MAKE) -C $(LIBSUBCMD_DIR) O=$(LIBSUBCMD_OUTPUT) \
+ DESTDIR=$(LIBSUBCMD_DESTDIR) prefix= subdir= \
+ $@ install_headers
+
+$(LIBSUBCMD)-clean:
+ $(call QUIET_CLEAN, libsubcmd)
+ $(Q)$(RM) -r -- $(LIBSUBCMD_OUTPUT)

-clean:
+clean: $(LIBSUBCMD)-clean
$(call QUIET_CLEAN, objtool) $(RM) $(OBJTOOL)
$(Q)find $(OUTPUT) -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
- $(Q)$(RM) $(OUTPUT)arch/x86/lib/inat-tables.c $(OUTPUT)fixdep $(LIBSUBCMD)
+ $(Q)$(RM) $(OUTPUT)arch/x86/lib/inat-tables.c $(OUTPUT)fixdep

FORCE:

--
2.39.0.314.g84b9a713c41-goog