[PATCH] build: remove the variable NM in gen_ll_addressable_symbols.sh

[Patrick Delaunay]

With LTO activated, the buildman tools failed with an error on my
configuration (Ubuntu 20.04, stm32mp15_trusted_defconfig) with the error:

../arm-linux-gnueabi/bin/nm:
	scripts/gen_ll_addressable_symbols.sh: file format not recognized

It seems the shell variable initialization NM=$(NM) is not correctly
interpreted when shell is started in the Makefile, but I have not this
issue when I compile the same target without buildman.

I don't found the root reason of the problem but I solve it by
providing $(NM) as script parameter instead using a shell variable.

The command executed is identical:

cmd_keep-syms-lto.c := NM=arm-none-linux-gnueabihf-gcc-nm \
u-boot/scripts/gen_ll_addressable_symbols.sh arch/arm/cpu/built-in.o \
.... net/built-in.o >keep-syms-lto.c

cmd_keep-syms-lto.c := u-boot/scripts/gen_ll_addressable_symbols.sh \
arm-none-linux-gnueabihf-gcc-nm arch/arm/cpu/built-in.o \
... net/built-in.o > keep-syms-lto.c

Serie-cc: Marek Behún <marek.behun at nic.cz>
Serie-cc: sjg
Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
---

 Makefile                              | 2 +-
 scripts/Makefile.spl                  | 2 +-
 scripts/gen_ll_addressable_symbols.sh | 5 ++++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index ca2432c8ce..140dea09f4 100644
--- a/Makefile
+++ b/Makefile
@@ -1736,7 +1736,7 @@ u-boot-keep-syms-lto_c := $(patsubst %.o,%.c,$(u-boot-keep-syms-lto))
 
 quiet_cmd_keep_syms_lto = KSL     $@
       cmd_keep_syms_lto = \
-	NM=$(NM) $(srctree)/scripts/gen_ll_addressable_symbols.sh $^ >$@
+	$(srctree)/scripts/gen_ll_addressable_symbols.sh $(NM) $^ > $@
 
 quiet_cmd_keep_syms_lto_cc = KSLCC   $@
       cmd_keep_syms_lto_cc = \
diff --git a/scripts/Makefile.spl b/scripts/Makefile.spl
index 5be1a9ba1b..25a3e7fa52 100644
--- a/scripts/Makefile.spl
+++ b/scripts/Makefile.spl
@@ -459,7 +459,7 @@ u-boot-spl-keep-syms-lto_c := \
 
 quiet_cmd_keep_syms_lto = KSL     $@
       cmd_keep_syms_lto = \
-	NM=$(NM) $(srctree)/scripts/gen_ll_addressable_symbols.sh $^ >$@
+	$(srctree)/scripts/gen_ll_addressable_symbols.sh $(NM) $^ > $@
 
 quiet_cmd_keep_syms_lto_cc = KSLCC   $@
       cmd_keep_syms_lto_cc = \
diff --git a/scripts/gen_ll_addressable_symbols.sh b/scripts/gen_ll_addressable_symbols.sh
index 3978a39d97..b8840dd011 100755
--- a/scripts/gen_ll_addressable_symbols.sh
+++ b/scripts/gen_ll_addressable_symbols.sh
@@ -5,8 +5,11 @@
 # Generate __ADDRESSABLE(symbol) for every linker list entry symbol, so that LTO
 # does not optimize these symbols away
 
+# The expected parameter of this script is the command requested to have
+# the U-Boot symbols to parse, for example: $(NM) $(u-boot-main)
+
 set -e
 
 echo '#include <common.h>'
-$NM "$@" 2>/dev/null | grep -oe '_u_boot_list_2_[a-zA-Z0-9_]*_2_[a-zA-Z0-9_]*' | \
+$@ 2>/dev/null | grep -oe '_u_boot_list_2_[a-zA-Z0-9_]*_2_[a-zA-Z0-9_]*' | \
 	sort -u | sed -e 's/^\(.*\)/extern char \1[];\n__ADDRESSABLE(\1);/'
-- 
2.25.1