Fix: setup-stdlib script for gcc 11.2.0

Fixes issue where mod files were installed in the wrong location
since GCC was updated to v11.2.0.
Adds checks to the setup-stdlib script to check the installation.

Author: LKedward

utils/setup-stdlib.bat

@@ -1,16 +1,23 @@
 @echo off
 REM Helper script to install latest stdlib in the local MinGW installation
 
+setlocal
+
 set ORIG=%cd%
 set ROOT=%~dp0..
 
+set GCCVER=11.2.0
+set PREFIX=%ROOT%\mingw64
+set INCLUDE_PATH=lib\gcc\x86_64-w64-mingw32\%GCCVER%\finclude\
+
 echo Installation root is %ROOT%
 
 cd %ROOT%
 
 if NOT EXIST %ROOT%\mingw64 echo mingw64 installation not found && exit /b 1
 
 if NOT EXIST %ROOT%\stdlib git clone https://github.com/fortran-lang/stdlib.git
+if %errorlevel% neq 0 exit /b %errorlevel%
 
 cd stdlib
 git reset --hard
@@ -20,8 +27,31 @@ git pull
 echo [install] >> fpm.toml
 echo library = true >> fpm.toml
 
-fpm install --profile release --prefix %cd%\..\mingw64 --includedir lib\gcc\x86_64-w64-mingw32\10.3.0\finclude --verbose --flag "-DWITH_QP=1"
+REM Check output directory exists
+if not exist "%PREFIX%\%INCLUDE_PATH%" (
+  echo setup-stdlib error: Cannot find module include directory "%PREFIX%\%INCLUDE_PATH%"
+  exit /B 3
+)
+
+fpm install --profile release --prefix %PREFIX% --includedir %INCLUDE_PATH% --verbose --flag "-DWITH_QP=1"
+if %errorlevel% neq 0 exit /b %errorlevel%
+
+del /Q %PREFIX%\%INCLUDE_PATH%\test*.mod
+
+REM Check installation
+set LIB_OUT="%PREFIX%\lib\libstdlib.a"
+if not exist %LIB_OUT% (
+  echo Installation failed: cannot find %LIB_OUT%
+  exit /B 2
+)
+set INC_OUT="%PREFIX%\%INCLUDE_PATH%\stdlib_version.mod"
+if not exist %INC_OUT% (
+  echo Installation failed: cannot find %INC_OUT%
+  exit /B 2
+)
+
+echo stdlib built and installed successfully
 
-del /Q %ROOT%\mingw64\lib\gcc\x86_64-w64-mingw32\10.3.0\finclude\test*.mod
+cd %ORIG%
 
-cd %ORIG%
+endlocal