avoid rebuilds during updates

build.sh

@@ -1,5 +1,8 @@
 #! /usr/bin/env bash
 
+# Avoid rebuilds of the same version
+[[ ! -d build ]] && exit 0
+
 source util.sh
 cd build
 

configure.sh

@@ -3,9 +3,22 @@
 source util.sh
 
 VERSION=$1
+PREFIX="$2"
 URL="https://ftp.gnu.org/gnu/binutils/binutils-$VERSION.tar.xz"
 ARCHIVE=$(basename "$URL")
 
+# Avoid rebuilds of the same version
+
+existing_as="$PREFIX/bin/sh-elf-as"
+
+if [[ -f "$existing_as" ]]; then
+  existing_version=$($existing_as --version | head -n 1 | grep -Eo '[0-9.]+$')
+  if [[ $existing_version == $VERSION ]]; then
+    echo "$TAG Version $VERSION already installed, skipping rebuild"
+    exit 0
+  fi
+fi
+
 # Check dependencies for binutils and GCC
 
 if command -v apt >/dev/null 2>&1; then

giteapc.make

@@ -8,7 +8,7 @@ include giteapc-config-$(GITEAPC_CONFIG).make
 endif
 
 configure:
-	@ ./configure.sh $(VERSION)
+	@ ./configure.sh $(VERSION) "$(PREFIX)"
 
 build:
 	@ ./build.sh

install.sh

@@ -1,5 +1,8 @@
 #! /usr/bin/env bash
 
+# Avoid rebuilds of the same version
+[[ ! -d build ]] && exit 0
+
 source util.sh
 PREFIX="$1"