windows: Use labels as functions.

configure.bat

@@ -1,26 +1,36 @@
 @echo off
-@set vcvars64="C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Auxiliary\Build\vcvars64.bat"
+@setlocal
 
-@Rem ---------------------------------
-@Rem Windows terminal specific options
+call :main
 
-@set CC=clang-cl
-@echo C Compiler: %CC%
-@set CXX=clang-cl
-@echo C++ Compiler: %CXX%
+:check_env_vars
+    echo Running the function!
+exit /B 0
 
-@Rem ---------------------------------
-@Rem Windows terminal specific options
-@set CFLAGS=-fansi-escape-codes -fcolor-diagnostics %CFLAGS%
 
-@Rem ---------------------------------
-@Rem Default flags
-@set CFLAGS=-Wno-language-extension-token %CFLAGS%
+:setup_flags
+    @echo ------------------------------
+    @echo Setting up build flags...
 
-@echo Using CFLAGS=%CFLAGS%
+    :: ---------------------------------
+    :: Compilers
+    @set CC=clang-cl
+    @echo C Compiler: %CC%
+    @set CXX=clang-cl
+    @echo C++ Compiler: %CXX%
 
-@Rem ------------------------------------------------------
-@set MESONFLAGS=^
+    :: ---------------------------------
+    :: Windows terminal specific options
+    @set CFLAGS=-fansi-escape-codes -fcolor-diagnostics %CFLAGS%
+
+    :: ------------------------------------
+    :: Default flags for native compilation
+    @set CFLAGS=-Wno-language-extension-token %CFLAGS%
+
+    @echo Using CFLAGS=%CFLAGS%
+
+    :: ------------------------------------------------------
+    @set MESONFLAGS=^
      -Dopenssl_dir="C:/Users/Tiz/source/pkg/openssl/"^
      -Dregex_include_dir="C:/Users/Tiz/source/pkg/pcre-7.0/include/"^
      -Dregex_dir="C:/Users/Tiz/source/pkg/pcre-7.0/lib/"^
@@ -51,12 +61,19 @@
             -Dbindings=^
             --native-file native-file-windows.txt
 
-@if exist build (
+    @if exist build (
         @echo "Build directory ("build") already exists. Old config will be wiped with `--wipe`."
         @set MESONFLAGS=%MESONFLAGS% --wipe
-) else (
+    ) else (
         @echo No Creating new build directory.
-)
+    )
+exit /B 0
 
-@echo on
-%vcvars64% && meson build %MESONFLAGS%
+:main
+    @set vcvars64="C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Auxiliary\Build\vcvars64.bat"
+    call :setup_flags
+
+    @echo on
+    @echo Running meson with flags: %MESONFLAGS%
+    @echo
+    @%vcvars64% && meson build %MESONFLAGS%