fix 32-bit Windows XP build

Makefile

@@ -12,20 +12,24 @@ CXXSTD += -std=gnu++14
 
 CFLAGS += -Wall -Werror -Wfatal-errors
 CFLAGS += -Wno-error=unused-function
-CFLAGS += -Wno-error=unused-const-variable
+#CFLAGS += -Wno-error=unused-const-variable
 #CFLAGS += -Wno-error=unused-but-set-variable
 CFLAGS += -Wno-error=unused-variable
+CFLAGS += -Wno-error=narrowing
 CFLAGS += -I$(MAKEFILE_PATH)/include
 CFLAGS += -I$(dir $(GLFW))../include
 CXXFLAGS += -fno-exceptions
 #CFLAGS += -DDEBUG_BUTTONS
 #CFLAGS += -DDEBUG_AXES
-LDFLAGS += -nostdlib++ -lm
-ifeq ($(shell uname),Linux)
+LDFLAGS += -lm
+ifneq ($(shell uname),Darwin)
 LDFLAGS += -static-libgcc
 endif
+ifeq ($(shell uname),Linux)
+LDFLAGS += -nostdlib++
+endif
 ifeq ($(OS),Windows_NT)
-LDFLAGS += -Wl,--subsystem,windows -mwindows
+LDFLAGS += -Wl,--subsystem,windows -mwindows #-mconsole
 endif
 ifeq ($(shell uname),Darwin)
 LDFLAGS += -framework Foundation -framework IOKit -framework AppKit

include/math/transform.hpp

@@ -149,7 +149,8 @@ template <typename T>
 inline constexpr T inverse_length(vec<3, T> v)
 {
   float f = dot(v, v);
-  return 1.0f / sqrt<T>(f);
+  float sqrtf = sqrt(f);
+  return 1.0f / sqrtf;
 }
 
 template <typename T>

src/main.c

@@ -213,7 +213,7 @@ int main()
 
   glActiveTexture(GL_TEXTURE0);
   uint terminus_font = make_texture(src_font_ter_u32n_data_start,
-                                    GL_RED,
+                                    GL_RGB,
                                     256,
                                     256,
                                     GL_RED);