From 8b5c211c221c57f7fe07a811960a93253e934486 Mon Sep 17 00:00:00 2001
From: Ciro Santilli <ciro.santilli@gmail.com>
Date: Mon, 11 Jun 2018 18:17:31 +0100
Subject: [PATCH] gem5: build with ccache

CXX='ccache c++' does not work, CXX=/my/path/to/ccache/wrapper/c++
does not work, the only thing that works it to put it in your PATH.

I would rather put a wrapper that forwards to ccache in this repo to
avoid the external host dependency:

    #!/usr/bin/env bash
    ccache c++ "$@"

but then that script has to remove its directory from PATH or else
infinite recursion, and I have no patience to code that.

I considered using the ccache from Buildroot, but it does not setup the
nice /usr/lib PATH, so I gave up on that as well.
---
 configure  | 1 +
 gem5/build | 1 +
 2 files changed, 2 insertions(+)

diff --git a/configure b/configure
index 6f5d9a0..5b0fe4d 100755
--- a/configure
+++ b/configure
@@ -40,6 +40,7 @@ wget \
 "
 if "$gem5"; then
   pkgs="$pkgs \
+ccache \
 gcc-aarch64-linux-gnu \
 gcc-arm-linux-gnueabi \
 libgoogle-perftools-dev \
diff --git a/gem5/build b/gem5/build
index 6b5fa78..029cebd 100755
--- a/gem5/build
+++ b/gem5/build
@@ -28,6 +28,7 @@ system_dir="${outdir}/system"
 binaries_dir="${system_dir}/binaries"
 disks_dir="${system_dir}/disks"
 mkdir -p "$binaries_dir" "$disks_dir"
+export PATH="/usr/lib/ccache:${PATH}"
 if [ "$arch" = x86_64 ]; then
   scons -j "$j" --ignore-style "${outdir}/build/X86/gem5.opt"
   f="${disks_dir}/linux-bigswap2.img"