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Set lld as the default linker for Clang builds 

The LLVM linker replaces the GNU linker as default for the link on Clang
builds. It is possible to override the default linker by setting the LD build
flag.

The patch also updates the TF-A doc.

Change-Id: Ic08552b9994d4fa8f0d4863e67a2726c1dce2e35
Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>
Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com>
This commit is contained in:
Ambroise Vincent 2019-07-17 11:08:38 +01:00 committed by Mark Dykes
parent 62ee142531
commit 641f16e756
2 changed files with 19 additions and 6 deletions
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16
Makefile
View File

@ -1,5 +1,5 @@
#
# Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
# Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
#
@ -209,7 +209,10 @@ PP = $(CC) -E $(TF_CFLAGS_$(ARCH))
else ifneq ($(findstring clang,$(notdir $(CC))),)
TF_CFLAGS_aarch32 = $(target32-directive) $(march32-directive)
TF_CFLAGS_aarch64 = -target aarch64-elf $(march64-directive)
LD = $(LINKER)
LD = ld.lld
ifeq (, $(shell which $(LD)))
$(error "No $(LD) in PATH, make sure it is installed or set LD to a different linker")
endif
AS = $(CC) -c -x assembler-with-cpp $(TF_CFLAGS_$(ARCH))
CPP = $(CC) -E
PP = $(CC) -E
@ -317,10 +320,13 @@ endif
GCC_V_OUTPUT := $(shell $(CC) -v 2>&1)
# LD = armlink
ifneq ($(findstring armlink,$(notdir $(LD))),)
TF_LDFLAGS += --diag_error=warning --lto_level=O1
TF_LDFLAGS += --remove --info=unused,unusedsymbols
TF_LDFLAGS += $(TF_LDFLAGS_$(ARCH))
# LD = gcc (used when GCC LTO is enabled)
else ifneq ($(findstring gcc,$(notdir $(LD))),)
# Pass ld options with Wl or Xlinker switches
TF_LDFLAGS += -Wl,--fatal-warnings -O1
@ -337,11 +343,17 @@ ifneq (${ERRATA_A53_843419},1)
endif
TF_LDFLAGS += -nostdlib
TF_LDFLAGS += $(subst --,-Xlinker --,$(TF_LDFLAGS_$(ARCH)))
# LD = gcc-ld (ld) or llvm-ld (ld.lld) or other
else
TF_LDFLAGS += --fatal-warnings -O1
TF_LDFLAGS += --gc-sections
# ld.lld doesn't recognize the errata flags,
# therefore don't add those in that case
ifeq ($(findstring ld.lld,$(notdir $(LD))),)
TF_LDFLAGS += $(TF_LDFLAGS_$(ARCH))
endif
endif
DTC_FLAGS += -I dts -O dtb
DTC_CPPFLAGS += -nostdinc -Iinclude -undef -x assembler-with-cpp

9
docs/getting_started/initial-build.rst
View File

@ -18,9 +18,10 @@ Performing an Initial Build
It is possible to build TF-A using Clang or Arm Compiler 6. To do so
``CC`` needs to point to the clang or armclang binary, which will
also select the clang or armclang assembler. Be aware that the
GNU linker is used by default. In case of being needed the linker
can be overridden using the ``LD`` variable. Clang linker version 6 is
also select the clang or armclang assembler. Be aware that for Arm Compiler,
the GNU linker is used by default. However for Clang LLVM linker (LLD)
is used by default. In case of being needed the linker can be overridden
using the ``LD`` variable. LLVM linker (LLD) version 9 is
known to work with TF-A.
In both cases ``CROSS_COMPILE`` should be set as described above.
@ -114,4 +115,4 @@ Performing an Initial Build
--------------
*Copyright (c) 2019, Arm Limited. All rights reserved.*
*Copyright (c) 2020, Arm Limited. All rights reserved.*