ccache: Fix for distcc cross-compiling / various improvements (#1026)

* ccache: Fix for distcc cross-compiling / various improvements

* Make ccache work when cross-compiling with distcc (fix #716)
* Allow to configure the ccache size in "pmbootstrap init"
* Moved ccache stats code from pmb/build/other.py to
  pmb/helpers/frontend.py
* Grouped job count, ccache size and timestamp based rebuilds
  together to "build options" and allow to skip them
* Sorted config options that had to be modified anyway
  alphabetically

* Improve comment in arch-bin-masquerade APKBUILD

cross/arch-bin-masquerade/APKBUILD

@@ -0,0 +1,43 @@
+# This package gets installed in the native and foreign arch chroots.
+# It creates files like /usr/lib/arch-bin-masquerade/armhf/gcc, which
+# point in the native chroot to the armhf-cross-compiler, and in the
+# armhf chroot to /usr/bin/gcc. That way compilation works fine, even
+# when distcc gets the absolute path to the compiler passed (ccache does
+# that).
+
+pkgname=arch-bin-masquerade
+pkgver=1
+pkgrel=0
+pkgdesc="Wrappers for ccache + distcc (native and foreign chroots)"
+url="https://postmarketOS.org"
+arch="all"
+license="MIT"
+options="!check !tracedeps"
+
+package() {
+	# Architectures and binaries
+	_archs="x86_64 armhf aarch64"
+	_bins="c++ cc cpp g++ gcc"
+
+	# Iterate over architectures
+	for _arch in $_archs; do
+		# Create the arch-specific bin folder
+		_hostspec="$(arch_to_hostspec $_arch)"
+		_bindir="$pkgdir/usr/lib/arch-bin-masquerade/$_arch"
+		mkdir -p "$_bindir"
+		cd "$_bindir"
+
+		# Iterate over binaries and create wrappers
+		for _bin in $_bins; do
+			{
+				echo "#!/bin/sh"
+				if [ "$_arch" == "$CARCH" ]; then
+					echo "exec /usr/bin/${_bin} \"\$@\""
+				else
+					echo "exec /usr/bin/${_hostspec}-${_bin} \"\$@\""
+				fi
+			} > "$_bin"
+			chmod +x "$_bin"
+		done
+	done
+}

cross/ccache-cross-symlinks/APKBUILD

@@ -1,16 +1,16 @@
-# Maintainer: Oliver Smith <ollieparanoid@bitmessage.ch>
-# NOTE: This could probably be upstreamed to the official ccache aport.
+# This package gets installed in the native chroot only. When cross-
+# compiling packages in the native chroot (e.g. kernel packages), the
+# cross-compiler does not get called directly, but wrapped through
+# ccache, which can then cache the results.
 
 pkgname=ccache-cross-symlinks
 pkgver=1
-pkgrel=3
+pkgrel=4
 pkgdesc="Enable ccache for cross-compilers with symlinks"
 url="https://ccache.samba.org/"
 arch="noarch"
 license="MIT"
 depends="ccache"
-makedepends=""
-source=""
 options="!check"
 
 package() {

cross/gcc-cross-wrappers/APKBUILD

@@ -1,28 +0,0 @@
-pkgname=gcc-cross-wrappers
-pkgver=1
-pkgrel=1
-pkgdesc="GCC wrappers pointing to cross-compilers (for distcc + ccache)"
-url="https://github.com/postmarketOS"
-arch="noarch"
-license="MIT"
-depends=""
-makedepends=""
-source=""
-options="!check"
-
-package() {
-	local _archs="armhf aarch64"
-	local _bins="c++ cc cpp g++ gcc"
-	for _arch in $_archs; do
-		_bindir="$pkgdir/usr/lib/gcc-cross-wrappers/$_arch/bin"
-		_hostspec="$(arch_to_hostspec $_arch)"
-		mkdir -p "$_bindir"
-		for _bin in $_bins; do
-			{
-				echo "#!/bin/sh"
-				echo "${_hostspec}-${_bin} \"\$@\""
-			} > $_bindir/$_bin
-			chmod +x $_bindir/$_bin
-		done
-	done
-}