Makefile: check for --exclude-libs

While writing to the dynsym is futile, the --exclude-libs options is not
recognized by all linkers (e.g. riscv64-elf-ld.bfd).

Signed-off-by: Leon M. Busch-George <leon@georgemail.eu>
Reviewed-by: Anup Patel <anup@brainfault.org>

diff --git a/Makefile b/Makefile
index 66048c38acb8a269a49589bbd6d41a3c7a415b6e..680c19a4bb19a2b8c15fe973454fdc92f93bc8c6 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -167,6 +167,9 @@ endif
 # Check whether the linker supports creating PIEs
 OPENSBI_LD_PIE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) $(USE_LD_FLAG) -fPIE -nostdlib -Wl,-pie -x c /dev/null -o /dev/null >/dev/null 2>&1 && echo y || echo n)
 
+# Check whether the linker supports --exclude-libs
+OPENSBI_LD_EXCLUDE_LIBS := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) $(USE_LD_FLAG) "-Wl,--exclude-libs,ALL" -x c /dev/null -o /dev/null >/dev/null 2>&1 && echo y || echo n)
+
 # Check whether the compiler supports -m(no-)save-restore
 CC_SUPPORT_SAVE_RESTORE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) -nostdlib -mno-save-restore -x c /dev/null -o /dev/null 2>&1 | grep -e "-save-restore" >/dev/null && echo n || echo y)
 
@@ -384,7 +387,9 @@ ASFLAGS             +=      $(firmware-asflags-y)
 ARFLAGS                =       rcs
 
 ELFFLAGS       +=      $(USE_LD_FLAG)
+ifeq ($(OPENSBI_LD_EXCLUDE_LIBS),y)
 ELFFLAGS       +=      -Wl,--exclude-libs,ALL
+endif
 ELFFLAGS       +=      -Wl,--build-id=none
 ELFFLAGS       +=      $(platform-ldflags-y)
 ELFFLAGS       +=      $(firmware-ldflags-y)