build: remove the variable NM in gen_ll_addressable_symbols.sh

[platform/kernel/u-boot.git] / scripts / Makefile.spl

diff --git a/scripts/Makefile.spl b/scripts/Makefile.spl
index ac2d203..25a3e7f 100644 (file)
--- a/scripts/Makefile.spl
+++ b/scripts/Makefile.spl
@@ -399,6 +399,8 @@ LDFLAGS_$(SPL_BIN) += -T u-boot-spl.lds $(LDFLAGS_FINAL)
 # Avoid 'Not enough room for program headers' error on binutils 2.28 onwards.
 LDFLAGS_$(SPL_BIN) += $(call ld-option, --no-dynamic-linker)
 
+LDFLAGS_$(SPL_BIN) += --build-id=none
+
 # Pick the best-match (i.e. SPL_TEXT_BASE for SPL, TPL_TEXT_BASE for TPL)
 ifneq ($(CONFIG_$(SPL_TPL_)TEXT_BASE),)
 LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_$(SPL_TPL_)TEXT_BASE)
@@ -448,8 +450,48 @@ quiet_cmd_sym ?= SYM     $@
 $(obj)/$(SPL_BIN).sym: $(obj)/$(SPL_BIN) FORCE
        $(call if_changed,sym)
 
+# Generate linker list symbols references to force compiler to not optimize
+# them away when compiling with LTO
+ifdef CONFIG_LTO
+u-boot-spl-keep-syms-lto := $(obj)/keep-syms-lto.o
+u-boot-spl-keep-syms-lto_c := \
+       $(patsubst $(obj)/%.o,$(obj)/%.c,$(u-boot-spl-keep-syms-lto))
+
+quiet_cmd_keep_syms_lto = KSL     $@
+      cmd_keep_syms_lto = \
+       $(srctree)/scripts/gen_ll_addressable_symbols.sh $(NM) $^ > $@
+
+quiet_cmd_keep_syms_lto_cc = KSLCC   $@
+      cmd_keep_syms_lto_cc = \
+       $(CC) $(filter-out $(LTO_CFLAGS),$(c_flags)) -c -o $@ $<
+
+$(u-boot-spl-keep-syms-lto_c): $(u-boot-spl-main) $(u-boot-spl-platdata)
+       $(call if_changed,keep_syms_lto)
+$(u-boot-spl-keep-syms-lto): $(u-boot-spl-keep-syms-lto_c)
+       $(call if_changed,keep_syms_lto_cc)
+else
+u-boot-spl-keep-syms-lto :=
+endif
+
 # Rule to link u-boot-spl
 # May be overridden by arch/$(ARCH)/config.mk
+ifdef CONFIG_LTO
+quiet_cmd_u-boot-spl ?= LTO     $@
+      cmd_u-boot-spl ?= \
+       (                                                                       \
+               cd $(obj) &&                                                    \
+               $(CC) -nostdlib -nostartfiles $(LTO_FINAL_LDFLAGS) $(c_flags)   \
+               $(KBUILD_LDFLAGS:%=-Wl,%) $(LDFLAGS_$(@F):%=-Wl,%)              \
+               $(patsubst $(obj)/%,%,$(u-boot-spl-init))                       \
+               -Wl,--whole-archive                                             \
+                       $(patsubst $(obj)/%,%,$(u-boot-spl-main))               \
+                       $(patsubst $(obj)/%,%,$(u-boot-spl-platdata))           \
+                       $(patsubst $(obj)/%,%,$(u-boot-spl-keep-syms-lto))      \
+                       $(PLATFORM_LIBS)                                        \
+               -Wl,--no-whole-archive                                          \
+               -Wl,-Map,$(SPL_BIN).map -o $(SPL_BIN)                           \
+       )
+else
 quiet_cmd_u-boot-spl ?= LD      $@
       cmd_u-boot-spl ?= \
        (                                                               \
@@ -462,9 +504,11 @@ quiet_cmd_u-boot-spl ?= LD      $@
                --no-whole-archive                                      \
                $(PLATFORM_LIBS) -Map $(SPL_BIN).map -o $(SPL_BIN)      \
        )
+endif
 
 $(obj)/$(SPL_BIN): $(u-boot-spl-platdata) $(u-boot-spl-init) \
-               $(u-boot-spl-main) $(obj)/u-boot-spl.lds FORCE
+               $(u-boot-spl-main) $(u-boot-spl-keep-syms-lto) \
+               $(obj)/u-boot-spl.lds FORCE
        $(call if_changed,u-boot-spl)
 
 $(sort $(u-boot-spl-init) $(u-boot-spl-main)): $(u-boot-spl-dirs) ;