Use LLVM Clang + Lld by default

README.md

@@ -58,8 +58,8 @@ int main(int argc, wchar_t **argv)
     return 0;
 }
 ```
-By default it uses the host native's GNU gcc + ld, creates a shared object and converts that into .efi file. If `USE_LLVM`
-is given, then LLVM CLang + lld used, and native PE is generated, no conversion involved.
+By default it uses Clang + lld, and PE is generated without conversion. If `USE_GCC` is set, then the host native's GNU gcc + ld
+used to create a shared object and get converted into an .efi file.
 
 ### Available Makefile Options
 
@@ -70,7 +70,7 @@ is given, then LLVM CLang + lld used, and native PE is generated, no conversion
 | `CFLAGS`   | compiler flags you want to use (empty by default, like "-Wall -pedantic -std=c99")                   |
 | `LDFLAGS`  | linker flags you want to use (I don't think you'll ever need this, just in case)                     |
 | `LIBS`     | additional libraries you want to link with (like "-lm", only static .a libraries allowed)            |
-| `USE_LLVM` | set this if you want LLVM Clang + Lld instead of GNU gcc + ld                                        |
+| `USE_GCC`  | set this if you want native GNU gcc + ld + objccopy instead of LLVM Clang + Lld                      |
 | `ARCH`     | the target architecture                                                                              |
 
 Here's a more advanced **Makefile** example:
@@ -82,7 +82,7 @@ CFLAGS = -pedantic -Wall -Wextra -Werror --std=c11 -O2
 LDFLAGS =
 LIBS = -lm
 
-USE_LLVM = 1
+USE_GCC = 1
 include uefi/Makefile
 ```
 The build environment configurator was created in a way that it can handle any number of architectures, however

examples/01_helloworld/Makefile

@@ -13,6 +13,6 @@ CFLAGS = -pedantic -Wall -Wextra -Werror --ansi -O2
 
 # leave the hard work and all the rest to posix-uefi
 
-# set this if you want LLVM Clang / Lld instead of GNU gcc / ld
-#USE_LLVM = 1
+# set this if you want GNU gcc + ld + objcopy instead of LLVM Clang + Lld
+#USE_GCC = 1
 include uefi/Makefile

examples/02_args/Makefile

@@ -1,4 +1,4 @@
 TARGET = args.efi
 
-#USE_LLVM=1
+#USE_GCC=1
 include uefi/Makefile

examples/03_dumpmem/Makefile

@@ -1,4 +1,4 @@
 TARGET = dumpmem.efi
 
-#USE_LLVM=1
+#USE_GCC=1
 include uefi/Makefile

uefi/Makefile

@@ -20,10 +20,10 @@ TMP = $(LIBSRCS:.c=.o)
 LIBOBJS = $(TMP:.S=.o)
 
 # detect toolchain
-ifeq ($(wildcard /usr/bin/gcc),)
-USE_LLVM = 1
+ifeq ($(wildcard /usr/bin/clang),)
+USE_GCC = 1
 endif
-ifeq ($(USE_LLVM),)
+ifneq ($(USE_GCC),)
 ifeq ($(ARCH),x86_64)
 CFLAGS += -maccumulate-outgoing-args
 endif
@@ -65,12 +65,12 @@ endif
 all: $(ALLTARGETS)
 
 uefi/libuefi.a:
-	@make --no-print-directory -C uefi libuefi.a USE_LLVM=$(USE_LLVM) ARCH=$(ARCH)
+	@make --no-print-directory -C uefi libuefi.a USE_GCC=$(USE_GCC) ARCH=$(ARCH)
 
 libuefi.lib: $(LIBOBJS)
 
 libuefi.a: $(LIBOBJS)
-ifeq ($(USE_LLVM),)
+ifneq ($(USE_GCC),)
 	@rm $@ 2>/dev/null || true
 	$(AR) -frsv $@ $(LIBOBJS) >/dev/null
 else
@@ -78,7 +78,7 @@ else
 endif
 
 $(TARGET): $(TARGET).so
-ifeq ($(USE_LLVM),)
+ifneq ($(USE_GCC),)
 	@$(OBJCOPY) -j .text -j .sdata -j .data -j .dynamic -j .dynsym  -j .rel -j .rela -j .rel.* -j .rela.* -j .reloc --target $(EFIARCH) --subsystem=10 $^ $@ || echo target: $(EFIARCH)
 	@rm $(TARGET).so
 endif