Add ccache as an optional spkg

[ohanar]

This is needed to eliminate the majority of the build time when switching between various branches in the git based workflow. It is also useful in the short run for dramatically speeding up the build process for many spkgs.

Installation:

• Add the spkg http://wstein.org/home/ohanar/spkgs/ccache-3.1.8.spkg to spkg/standard
• Apply attachment: trac13032_root.1.patch to the root repository
• Apply attachment: trac13032_scripts.patch to the scripts repository
• Apply attachment: trac13032_doc.patch to the sage library

CC: @kini @robertwb @ppurka @jdemeyer

Component: packages: optional

Keywords: sd40.5

Author: R. Andrew Ohana

Reviewer: Punarbasu Purkayastha

Merged: sage-5.6.beta2

Issue created by migration from https://trac.sagemath.org/ticket/13032

[ohanar]

comment:1

Not yet ready, the build scripts still need to be modified to set CC and CXX once this is installed.

[ohanar]

Description changed:

--- 
+++ 
@@ -1 +1,3 @@
 This is needed to eliminate build time when switching between various branches in the git based workflow.
+
+SPKG: [http://wstein.org/home/ohanar/spkgs/ccache-3.1.7.spkg](http://wstein.org/home/ohanar/spkgs/ccache-3.1.7.spkg)

[ohanar]

Dependencies: #13040

[ohanar]

Changed keywords from none to sd40.5

[ohanar]

Description changed:

--- 
+++ 
@@ -1,3 +1,7 @@
 This is needed to eliminate build time when switching between various branches in the git based workflow.
 
-SPKG: [http://wstein.org/home/ohanar/spkgs/ccache-3.1.7.spkg](http://wstein.org/home/ohanar/spkgs/ccache-3.1.7.spkg)
+Installation:
+
+* Add the spkg http://wstein.org/home/ohanar/spkgs/ccache-3.1.7.spkg to spkg/standard
+* Apply [attachment: trac13032.patch](https://github.com/sagemath/sage/files/ticket13032/trac13032.patch.gz) to the root repository
+

[ohanar]

Description changed:

--- 
+++ 
@@ -4,4 +4,5 @@
 
 * Add the spkg http://wstein.org/home/ohanar/spkgs/ccache-3.1.7.spkg to spkg/standard
 * Apply [attachment: trac13032.patch](https://github.com/sagemath/sage/files/ticket13032/trac13032.patch.gz) to the root repository
+* Apply [attachment: trac13032_scripts.patch](https://github.com/sagemath/sage-prod/files/10655656/trac13032_scripts.patch.gz) to the scripts repository
 

[ohanar]

Description changed:

--- 
+++ 
@@ -3,6 +3,7 @@
 Installation:
 
 * Add the spkg http://wstein.org/home/ohanar/spkgs/ccache-3.1.7.spkg to spkg/standard
+* Add the spkg http://wstein.org/home/ohanar/spkgs/f90cache-0.93.7.spkg to spkg/standard
 * Apply [attachment: trac13032.patch](https://github.com/sagemath/sage/files/ticket13032/trac13032.patch.gz) to the root repository
 * Apply [attachment: trac13032_scripts.patch](https://github.com/sagemath/sage-prod/files/10655656/trac13032_scripts.patch.gz) to the scripts repository
 

[ohanar]

Description changed:

--- 
+++ 
@@ -4,6 +4,7 @@
 
 * Add the spkg http://wstein.org/home/ohanar/spkgs/ccache-3.1.7.spkg to spkg/standard
 * Add the spkg http://wstein.org/home/ohanar/spkgs/f90cache-0.93.7.spkg to spkg/standard
+* Add the spkg http://wstein.org/home/ohanar/spkgs/ecl-11.1.2.cvs20111120.p2.spkg to spkg/standard
 * Apply [attachment: trac13032.patch](https://github.com/sagemath/sage/files/ticket13032/trac13032.patch.gz) to the root repository
 * Apply [attachment: trac13032_scripts.patch](https://github.com/sagemath/sage-prod/files/10655656/trac13032_scripts.patch.gz) to the scripts repository
 

[ohanar]

Changed dependencies from #13040 to #13040 #13044