Fix issue #97: Teach install.sh to install libcaffeine.a

fpm is currently unable to install submodule files, but with this
workaround we can at least install libcaffeine.a, which is all that's
actually needed to link against multi-image flang executables.

Author: bonachea

install.sh

@@ -515,10 +515,24 @@ chmod u+x $RUN_FPM_SH
 
 ./$RUN_FPM_SH build $VERBOSE
 
+LIBCAFFEINE_DST=libcaffeine-$GASNET_CONDUIT.a
+LIBCAFFEINE_SRC=$(./$RUN_FPM_SH install --list 2>/dev/null | grep libcaffeine | cut -d' ' -f2)
+
+if [ -z "$LIBCAFFEINE_SRC" ]; then
+  echo "ERROR: Failed to detect libcaffeine.a from fpm"
+  exit 1
+else
+  mkdir -p "$PREFIX/lib"
+  cp -af "$LIBCAFFEINE_SRC" "$PREFIX/lib/$LIBCAFFEINE_DST"
+  ln -sf "$LIBCAFFEINE_DST" "$PREFIX/lib/libcaffeine.a"
+fi
+
 cat << EOF
 
 ________________ Caffeine has been dispensed! ________________
 
+Caffeine is now installed in $PREFIX
+
 To rebuild or to run tests or examples via the Fortran Package
 Manager (fpm) with the required compiler/linker flags, pass a
 fpm command to the build/run-fpm.sh script. For example, run

manifest/fpm.toml.template

@@ -10,4 +10,7 @@ assert = {git = "https://github.com/berkeleylab/assert.git", tag = "3.0.0"}
 veggies = {git = "https://gitlab.com/everythingfunctional/veggies", tag = "v1.1.3"}
 iso_varying_string = {git = "https://gitlab.com/everythingfunctional/iso_varying_string.git", tag = "v3.0.4"}
 
+[install]
+library = true
+
 [build]