Add SQLITE_ENABLE_DBSTAT_VTAB to compilation

CHANGELOG.md

@@ -1,6 +1,8 @@
 # Changelog
 
 ## Unlreleased
+- added: `SQLITE_ENABLE_DBSTAT_VTAB=1`.
+- changed: Allow `EXQLITE_SYSTEM_CFLAGS` to be appended to the `CFLAGS` regardless.
 
 ## v0.13.0 - 2023-01-11
 - removed: Remove support for Elixir 1.11

Makefile

@@ -26,10 +26,6 @@ ifeq ($(EXQLITE_USE_SYSTEM),)
 	HEADERS += c_src/sqlite3.h c_src/sqlite3ext.h
 	CFLAGS += -Ic_src
 else
-	ifneq ($(EXQLITE_SYSTEM_CFLAGS),)
-		CFLAGS += $(EXQLITE_SYSTEM_CFLAGS)
-	endif
-
 	ifneq ($(EXQLITE_SYSTEM_LDFLAGS),)
 		LDFLAGS += $(EXQLITE_SYSTEM_LDFLAGS)
 	else
@@ -113,6 +109,12 @@ CFLAGS += -DSQLITE_ENABLE_MATH_FUNCTIONS=1
 CFLAGS += -DSQLITE_ENABLE_RBU=1
 CFLAGS += -DSQLITE_ENABLE_RTREE=1
 CFLAGS += -DSQLITE_OMIT_DEPRECATED=1
+CFLAGS += -DSQLITE_ENABLE_DBSTAT_VTAB=1
+
+# Add any extra flags set in the environment
+ifneq ($(EXQLITE_SYSTEM_CFLAGS),)
+	CFLAGS += $(EXQLITE_SYSTEM_CFLAGS)
+endif
 
 # Set Erlang-specific compile flags
 ERL_CFLAGS ?= -I$(ERL_EI_INCLUDE_DIR)

README.md

@@ -52,6 +52,18 @@ config :exqlite, default_chunk_size: 100
 
 ## Advanced Configuration
 
+### Defining Extra Compile Flags
+
+You can enable certain features by doing the following:
+
+```bash
+export EXQLITE_SYSTEM_CFLAGS=-DSQLITE_ENABLE_DBSTAT_VTAB=1
+```
+
+### Listing Flags Used For Compilation
+
+If you `export V=1` the flags used for compilation will be output to stdout.
+
 ### Using System Installed Libraries
 
 This will vary depending on the operating system.