| 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | ifneq ($(O),) |
| 3 | ifeq ($(origin O), command line) |
| 4 | dummy := $(if $(shell test -d $(O) || echo $(O)),$(error O=$(O) does not exist),) |
| 5 | ABSOLUTE_O := $(shell cd $(O) ; pwd) |
| 6 | OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/) |
| 7 | COMMAND_O := O=$(ABSOLUTE_O) |
| 8 | ifeq ($(objtree),) |
| 9 | objtree := $(O) |
| 10 | endif |
| 11 | endif |
| 12 | endif |
| 13 | |
| 14 | # check that the output directory actually exists |
| 15 | ifneq ($(OUTPUT),) |
| 16 | OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd) |
| 17 | $(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist)) |
| 18 | endif |
| 19 | |
| 20 | # |
| 21 | # Include saner warnings here, which can catch bugs: |
| 22 | # |
| 23 | EXTRA_WARNINGS := -Wbad-function-cast |
| 24 | EXTRA_WARNINGS += -Wdeclaration-after-statement |
| 25 | EXTRA_WARNINGS += -Wformat-security |
| 26 | EXTRA_WARNINGS += -Wformat-y2k |
| 27 | EXTRA_WARNINGS += -Winit-self |
| 28 | EXTRA_WARNINGS += -Wmissing-declarations |
| 29 | EXTRA_WARNINGS += -Wmissing-prototypes |
| 30 | EXTRA_WARNINGS += -Wnested-externs |
| 31 | EXTRA_WARNINGS += -Wno-system-headers |
| 32 | EXTRA_WARNINGS += -Wold-style-definition |
| 33 | EXTRA_WARNINGS += -Wpacked |
| 34 | EXTRA_WARNINGS += -Wredundant-decls |
| 35 | EXTRA_WARNINGS += -Wshadow |
| 36 | EXTRA_WARNINGS += -Wstrict-prototypes |
| 37 | EXTRA_WARNINGS += -Wswitch-default |
| 38 | EXTRA_WARNINGS += -Wswitch-enum |
| 39 | EXTRA_WARNINGS += -Wundef |
| 40 | EXTRA_WARNINGS += -Wwrite-strings |
| 41 | EXTRA_WARNINGS += -Wformat |
| 42 | |
| 43 | CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?) |
| 44 | |
| 45 | ifeq ($(CC_NO_CLANG), 1) |
| 46 | EXTRA_WARNINGS += -Wstrict-aliasing=3 |
| 47 | endif |
| 48 | |
| 49 | # Hack to avoid type-punned warnings on old systems such as RHEL5: |
| 50 | # We should be changing CFLAGS and checking gcc version, but this |
| 51 | # will do for now and keep the above -Wstrict-aliasing=3 in place |
| 52 | # in newer systems. |
| 53 | # Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h |
| 54 | ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3 |
| 55 | EXTRA_WARNINGS += -fno-strict-aliasing |
| 56 | endif |
| 57 | |
| 58 | ifneq ($(findstring $(MAKEFLAGS), w),w) |
| 59 | PRINT_DIR = --no-print-directory |
| 60 | else |
| 61 | NO_SUBDIR = : |
| 62 | endif |
| 63 | |
| 64 | ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) |
| 65 | silent=1 |
| 66 | endif |
| 67 | |
| 68 | # |
| 69 | # Define a callable command for descending to a new directory |
| 70 | # |
| 71 | # Call by doing: $(call descend,directory[,target]) |
| 72 | # |
| 73 | descend = \ |
| 74 | +mkdir -p $(OUTPUT)$(1) && \ |
| 75 | $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2) |
| 76 | |
| 77 | QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir |
| 78 | QUIET_SUBDIR1 = |
| 79 | |
| 80 | ifneq ($(silent),1) |
| 81 | ifneq ($(V),1) |
| 82 | QUIET_CC = @echo ' CC '$@; |
| 83 | QUIET_CC_FPIC = @echo ' CC FPIC '$@; |
| 84 | QUIET_AR = @echo ' AR '$@; |
| 85 | QUIET_LINK = @echo ' LINK '$@; |
| 86 | QUIET_MKDIR = @echo ' MKDIR '$@; |
| 87 | QUIET_GEN = @echo ' GEN '$@; |
| 88 | QUIET_SUBDIR0 = +@subdir= |
| 89 | QUIET_SUBDIR1 = ;$(NO_SUBDIR) \ |
| 90 | echo ' SUBDIR '$$subdir; \ |
| 91 | $(MAKE) $(PRINT_DIR) -C $$subdir |
| 92 | QUIET_FLEX = @echo ' FLEX '$@; |
| 93 | QUIET_BISON = @echo ' BISON '$@; |
| 94 | |
| 95 | descend = \ |
| 96 | +@echo ' DESCEND '$(1); \ |
| 97 | mkdir -p $(OUTPUT)$(1) && \ |
| 98 | $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2) |
| 99 | |
| 100 | QUIET_CLEAN = @printf ' CLEAN %s\n' $1; |
| 101 | QUIET_INSTALL = @printf ' INSTALL %s\n' $1; |
| 102 | endif |
| 103 | endif |