Support more than one toolchain.

bootstrap.conf

@@ -1,7 +1,25 @@
 #!/bin/bash
 
-readonly GCC="gcc-3.4.6"
-readonly GCC_VER="3.4.6"
+case "${VERSION}" in
+  2)
+    readonly GCC_VER="2.95.3"
+    readonly BINUTILS_VER="2.9.1"
+    ;;
+  3)
+    readonly GCC_VER="3.4.6"
+    readonly BINUTILS_VER="2.14"
+    ;;
+  4)
+    readonly GCC_VER="4.5.0"
+    readonly BINUTILS_VER="2.14"
+    ;;
+  *)
+    echo "Unsupported toolchain version: ${VERSION}"
+    exit 1
+    ;;
+esac
+
+readonly GCC="gcc-${GCC_VER}"
 readonly GCC_CORE_SRC="gcc-core-${GCC_VER}.tar.gz"
 readonly GCC_CPP_SRC="gcc-g++-${GCC_VER}.tar.gz"
 
@@ -16,7 +34,7 @@ readonly MPFR="mpfr-3.1.2"
 readonly MPFR_SRC="${MPFR}.tar.bz2"
 # END GCC 4.x dependencies
 
-readonly BINUTILS="binutils-2.14"
+readonly BINUTILS="binutils-${BINUTILS_VER}"
 readonly BINUTILS_SRC="${BINUTILS}.tar.gz"
 
 readonly IXEMUL="ixemul-48.2"

bootstrap.sh

@@ -9,8 +9,6 @@ readonly HOST_DIR="${TOP_DIR}/host"
 readonly STAMP="${TOP_DIR}/stamps"
 readonly MAKE="make -j$(getconf NPROCESSORS_CONF)"
 
-source "${TOP_DIR}/bootstrap.conf"
-
 function prepare_target {
   mkdir -p "${STAMP}" "${BUILD_DIR}" "${PREFIX}"
 
@@ -490,6 +488,8 @@ function build_ixemul {
 }
 
 function build {
+  source "${TOP_DIR}/bootstrap.conf"
+
   # On 64-bit architecture GNU Assembler crashes writing out an object, due to
   # (probably) miscalculated structure sizes.  There could be some other bugs
   # lurking there in 64-bit mode, but I have little incentive chasing them.
@@ -538,6 +538,7 @@ function build {
 
 function main {
   PREFIX="${TOP_DIR}/target"
+  VERSION="2"
 
   local action="build"
 
@@ -549,6 +550,9 @@ function main {
       --clean)
         action="clean"
         ;;
+      --version=*)
+        VERSION=${1#*=}
+        ;;
       *)
         echo "Unknown option: $1"
         exit 1