Make it work with flake.nix

Makefile

@@ -12,28 +12,35 @@ PCH_RELEASE := $(OBJ_DIR)/release/pch.h.gch
 GENERATED_HEADER := $(INCLUDE_DIR)/scripting/ruby_compiled.h
 
 CCACHE := ccache
-CXX := $(CCACHE) clang++
-CC := $(CCACHE) musl-clang
+
+CXX ?= x86_64-unknown-linux-musl-g++
+CC ?= x86_64-unknown-linux-musl-gcc
+
+CXX := $(CCACHE) $(CXX)
+CC := $(CCACHE) $(CC)
 
 CFLAGS_DEBUG :=\
-	-std=c++20 -Wall -Wextra \
+	-std=c++20 -Wall -Wextra -static \
 	-O0 -fno-inline -gsplit-dwarf \
 	-g -fno-omit-frame-pointer \
-	-Wno-unused-command-line-argument \
-	-I./include -I./libs -I./libs/mruby/include
+	-I./include -I./libs -I./libs/mruby/include -I./libs/json/include -I./libs/mruby/build/host/include
 
 # C_SANITIZER := -fsanitize=address
 
 CFLAGS_RELEASE :=\
-	-static --target=x86_64-linux-musl \
-	-std=c++20 -O3 -march=x86-64 -mtune=generic \
-  -fno-rtti \
+	-static \
+	-std=c++20 -O3 -march=x86-64 -mtune=generic -fno-rtti \
 	-ffast-math -flto=thin \
 	-fvisibility=hidden \
 	-fomit-frame-pointer -DNDEBUG -s \
 	-mllvm -vectorize-loops \
-	-Wno-unused-command-line-argument \
-	-I./include -I./libs -I./libs/mruby/include
+	-I./include -I./libs -I./libs/mruby/include -I./libs/json/include -I./libs/mruby/build/host/include
+
+PCRE_CFLAGS := $(shell pkg-config --cflags libpcre2-8)
+PCRE_LIBS := $(shell pkg-config --static --libs libpcre2-8)
+
+CFLAGS_DEBUG += $(PCRE_CFLAGS)
+CFLAGS_RELEASE += $(PCRE_CFLAGS)
 
 PCH_CFLAGS_DEBUG := $(CFLAGS_DEBUG) -x c++-header
 PCH_CFLAGS_RELEASE := $(CFLAGS_RELEASE) -x c++-header
@@ -43,13 +50,15 @@ UNICODE_SRC := $(wildcard libs/unicode_width/*.c)
 UNICODE_OBJ_DEBUG := $(patsubst libs/unicode_width/%.c,$(OBJ_DIR)/debug/unicode_width/%.o,$(UNICODE_SRC))
 UNICODE_OBJ_RELEASE := $(patsubst libs/unicode_width/%.c,$(OBJ_DIR)/release/unicode_width/%.o,$(UNICODE_SRC))
 
-LIBS_RELEASE := \
-	libs/libgrapheme/libgrapheme.a ./libs/mruby/build/host/lib/libmruby.a \
-	-Wl,-Bstatic,--gc-sections -lpcre2-8
-
 LIBS_DEBUG := \
-	libs/libgrapheme/libgrapheme.a ./libs/mruby/build/host/lib/libmruby.a \
-	-Wl,-Bdynamic -lpcre2-8
+	libs/libgrapheme/libgrapheme.a \
+	./libs/mruby/build/host/lib/libmruby.a \
+	$(PCRE_LIBS)
+
+LIBS_RELEASE := \
+	libs/libgrapheme/libgrapheme.a \
+	./libs/mruby/build/host/lib/libmruby.a \
+	$(PCRE_LIBS)
 
 SRC := $(wildcard $(SRC_DIR)/**/*.cc) $(wildcard $(SRC_DIR)/*.cc)
 OBJ_DEBUG := $(patsubst $(SRC_DIR)/%.cc,$(OBJ_DIR)/debug/%.o,$(SRC))