In theory, gcc -v should give target arch

.ci/setup_static_deps

@@ -7,8 +7,7 @@
 #   CMAKE_INSTALL_PREFIX
 #   (optional) SUDOCMD
 
-host="$(pacman --version)"
-
+host="$(gcc -v)"
 set -e
 
 # options file may be passed as argument

dune-copasi.opts

@@ -48,8 +48,8 @@ if [[ -z $OS_TARGET ]]; then
     [ ! -w "$CMAKE_INSTALL_PREFIX" ] && SUDOCMD="sudo"
   elif [[ "$OSTYPE" == "msys" ]]; then
     # Lightweight shell and GNU utilities compiled for Windows (part of MinGW)
-    [[ "$(uname -a)" = 'x86_64'* ]] && OS_TARGET="win64"
-    [[ "$(uname -a)" = 'i686'* ]] && OS_TARGET="win32"
+    [[ "$(gcc -v)" = *'x86_64'* ]] && OS_TARGET="win64"
+    [[ "$(gcc -v)" = *'i686'* ]] && OS_TARGET="win32"
     CXX_FLAGS+="-static -static-libgcc -Wa,-mbig-obj"
   fi
 fi