more configs work now

```
make LIBC=gnu LINK=dynamic
make LIBC=musl LINK=dynamic CC=musl-gcc
make LIBC=musl LINK=static CC=musl-gcc
```

example/Makefile

@@ -36,11 +36,8 @@ THIS_DIR := $(dir $(realpath $(lastword $(MAKEFILE_LIST))))
 REPO_ROOT := $(realpath $(THIS_DIR)/..)
 CARGO_OBJDIR := cargo/$(RUST_TARGET)/$(_profile)
 
-# TODO: check if override is needed
 _rust_cli_profile := $(if $(filter $(_profile),debug),dev,$(_profile))
 
-# TODO: `make LINK=static` fails with linker error "undefined reference to `_dl_find_object'" in libgcc_eh.a
-
 STRIPFLAGS += -s --strip-unneeded -R .comment -R .gnu.version -R .note -R .note.gnu.build-id -R .note.ABI-tag
 STATIC_LINK_LIBS += -lservicepoint_binding_c
 
@@ -57,7 +54,7 @@ CARGOFLAGS += --manifest-path=$(REPO_ROOT)/Cargo.toml \
 CFLAGS += -Wall -Wextra -pedantic -fwhole-program -fPIE -pie
 _no_debug_cflags := -ffunction-sections -fdata-sections -Wl,--gc-sections
 size_optimized_CFLAGS += -Oz \
-	-fwrapv -fomit-frame-pointer -fno-stack-protector\
+	-fwrapv -fomit-frame-pointer -fno-stack-protector \
 	-fno-unroll-loops \
 	-fno-unwind-tables -fno-asynchronous-unwind-tables \
 	-fmerge-all-constants \
@@ -81,20 +78,25 @@ CFLAGS += $($(_libc)_CFLAGS) $($(_profile)_CFLAGS) $($(_link_type)_CFLAGS) $(_se
 ifeq ($(LTO), 1)
 	CFLAGS += -flto
 endif
+ifeq ($(_libc),gnu)
+	ifeq ($(_link_type),static)
+		CFLAGS += $(error "statically linking glibc is known to be broken")
+	endif
+endif
 
 size_optimized_RUSTFLAGS += -Zlocation-detail=none \
 	-Zfmt-debug=none \
 	-C link-arg=-z,norelro \
-	-C panic=abort
-	#-C link-arg=--hash-style=gnu
-musl_RUSTFLAGS += --crate-type=staticlib -Ctarget-feature=-crt-static
+	-C panic=abort \
+	-C link-arg=-Wl,--hash-style=gnu
+static_RUSTFLAGS += --crate-type=staticlib -Ctarget-feature=+crt-static
 
 RUSTFLAGS += $($(_libc)_RUSTFLAGS) $($(_profile)_RUSTFLAGS) $($(_link_type)_RUSTFLAGS)
 ifneq ($(_profile), debug)
 	RUSTFLAGS += -C link-arg=-s -C link-arg=-Wl,--gc-sections
 endif
 
-# TODO: wildcard does not work with VPATH
+# ADD NEW EXAMPLES HERE
 _c_src := src/announce.c src/brightness_tester.c src/header_logger.c \
 	src/moving_line.c src/random_stuff.c src/wiping_clear.c
 _programs := $(basename $(notdir $(_c_src)))