Add lua52compat feature flag

Author: khvzak

.github/workflows/main.yml

@@ -81,6 +81,7 @@ jobs:
     - name: Run ${{ matrix.lua }} tests
       run: |
         cargo test --manifest-path testcrate/Cargo.toml --release
+        cargo test --manifest-path testcrate/Cargo.toml --release --features lua52compat
       shell: bash
 
   rustfmt:

Cargo.toml

@@ -11,5 +11,8 @@ description = """
 Sources of LuaJIT 2.1 (OpenResty's branch) and logic to build it.
 """
 
+[features]
+lua52compat = []
+
 [dependencies]
 cc = "1.0"

src/lib.rs

@@ -105,8 +105,13 @@ impl Build {
             make.env("CROSS", prefix);
         }
 
+        let mut xcflags = vec!["-fPIC"];
+        if cfg!(feature = "lua52compat") {
+            xcflags.push("-DLUAJIT_ENABLE_LUA52COMPAT");
+        }
+
         make.env("BUILDMODE", "static");
-        make.env("XCFLAGS", "-fPIC");
+        make.env("XCFLAGS", xcflags.join(" "));
         self.run_command(make, "building LuaJIT");
 
         for f in &["lauxlib.h", "lua.h", "luaconf.h", "luajit.h", "lualib.h"] {

testcrate/Cargo.toml

@@ -3,5 +3,8 @@ name = "testcrate"
 version = "0.1.0"
 authors = ["Aleksandr Orlenko <[email protected]>"]
 
+[features]
+lua52compat = ["luajit-src/lua52compat"]
+
 [build-dependencies]
 luajit-src = { path = ".." }