ci: add a vtcc step (check that vtcc, continues to be able to compile with v, and v itself can be compiled with vtcc) (#21000)

Author: spytheman

.github/workflows/compile_v_with_vtcc.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+set -ex
+
+function show() {
+  printf "\u001b[35m$1\u001b[0m\n"
+}
+
+show "Prepare"
+rm -rf vtcc/
+
+show "Clone vtcc"
+git clone https://github.com/felipensp/vtcc --branch stable --quiet vtcc/
+du -s vtcc/
+## TODO: just `./v vtcc`, later will cause V, to detect the compiler as tcc (which it is), and add `-fwrapv`, which causes the vtcc compiler to panic currently
+show "Compile vtcc"
+./v -o vtcc/xx vtcc/
+ls -la vtcc/xx
+./vtcc/xx --version
+
+show "Generate the C file, for the current V version"
+./v -o vlang.c cmd/v
+ls -la vlang.c
+
+show "Compile the C file with vtcc"
+export tcclib=thirdparty/tcc/lib/tcc 
+export tccinc=$tcclib/include
+./vtcc/xx -o v_compiled_with_vtcc vlang.c -L$tcclib -I$tccinc -lc -ldl -pthread -ltcc1 $tcclib/bt-log.o
+ls -la v_compiled_with_vtcc
+
+show "Test the resulting V compiler"
+./v_compiled_with_vtcc version
+./v_compiled_with_vtcc -showcc run examples/hello_world.v
+
+## TODO: this step passes locally, but fails on the main CI:
+## show "Compile and run hello with vtcc"
+## ./v_compiled_with_vtcc -showcc -cc ./vtcc/xx run examples/hello_world.v
+
+show "Remove the generated temporary files, so the script can be re-run cleanly"
+rm -rf v_compiled_with_vtcc vlang.c vtcc/

.github/workflows/v_apps_and_modules_compile_ci.yml

@@ -27,6 +27,9 @@ jobs:
           sudo apt-get install --quiet -y libgc-dev libsodium-dev libssl-dev sqlite3 libsqlite3-dev libfreetype6-dev libxi-dev libxcursor-dev libgl-dev xfonts-75dpi xfonts-base
           sudo apt-get install --quiet -y --no-install-recommends sassc libgit2-dev ## needed by gitly
 
+      - name: Test vtcc
+        run: .github/workflows/compile_v_with_vtcc.sh
+
       - name: Test vsql compilation and examples
         run: |
           echo "Install vsql"