Use clang when possible for tools (#990)

* Use clang when possible for tools

* Add LLD ?= 0

tools/Makefile

@@ -1,7 +1,21 @@
-CC := gcc
 CFLAGS := -Wall -Wextra -pedantic -std=c99 -g -O2
 PROGRAMS := yaz0 makeromfs elf2rom mkldscript vtxdis
-ZAPD := ZAPD/ZAPD.out
+
+ifeq ($(shell command -v clang >/dev/null 2>&1; echo $$?),0)
+  CC := clang
+else
+  CC := gcc
+endif
+
+LLD ?= 0
+
+ifeq ($(shell command -v ld.lld >/dev/null 2>&1; echo $$?),0)
+  LLD := 1
+endif
+
+ifneq ($(LLD),0)
+  CFLAGS += -fuse-ld=lld
+endif
 
 all: $(PROGRAMS)
 	cd ZAPD && $(MAKE)

tools/vtxdis.c

@@ -254,4 +254,4 @@ int main(int argc, char **argv)
     }
 
     return 0;
-}
+}