Add a gcc package

[jdemeyer]

The aim is to add a GCC package (GNU compiler collection) to Sage with compilers for C, C++ and Fortran. We don't always build it, we would install it by default only on systems where this is needed. This would replace the fortran package.

spkg: http://boxen.math.washington.edu/home/jdemeyer/spkg/gcc-4.6.3.spkg

Apply:

1. attachment: 12369_gcc_root.patch and attachment: 12369_gcc_root_part2.patch to the SAGE_ROOT repository.
2. attachment: 12369_scripts_hgignore.patch to the SCRIPTS repository.
3. attachment: 12369_doc.patch to the Sage library.

See also:

1. When building GCC, build MPIR without the C++ interface #12782: When building GCC, build MPIR without the C++ interface (superseded by Upgrade MPIR to a more recent upstream release #11616).

Depends on #12479
Depends on #12602
Depends on #12608
Depends on #12609
Depends on #12647
Depends on #10492
Depends on #12367
Depends on #12368
Depends on #12405
Depends on #12570
Depends on #12574
Depends on #12423
Depends on #12425
Depends on #12456
Depends on #12363
Depends on #12223
Depends on #12515
Depends on #12519
Depends on #12548
Depends on #12562
Depends on #12629
Depends on #12638
Depends on #12714
Depends on #12647
Depends on #12739
Depends on #12112
Depends on #12631

CC: @vbraun

Component: packages: standard

Author: Jeroen Demeyer

Reviewer: Simon King

Merged: sage-5.0.beta13

Issue created by migration from https://trac.sagemath.org/ticket/12369

[jdemeyer]

Description changed:

--- 
+++ 
@@ -1 +1,3 @@
 The aim is to add a gcc package to Sage.  We probably don't want to always build it, we would install it by default only on systems where this is needed.
+
+**spkg**: [http://boxen.math.washington.edu/home/jdemeyer/spkg/gcc-4.4.6.spkg](http://boxen.math.washington.edu/home/jdemeyer/spkg/gcc-4.4.6.spkg)

[jdemeyer]

Description changed:

--- 
+++ 
@@ -1,3 +1,3 @@
-The aim is to add a gcc package to Sage.  We probably don't want to always build it, we would install it by default only on systems where this is needed.
+The aim is to add a gcc package to Sage.  We probably don't want to always build it, we would install it by default only on systems where this is needed.  This would replace the fortran package.
 
 **spkg**: [http://boxen.math.washington.edu/home/jdemeyer/spkg/gcc-4.4.6.spkg](http://boxen.math.washington.edu/home/jdemeyer/spkg/gcc-4.4.6.spkg)

[jdemeyer]

Changed dependencies from #12366, #12367, #12368 to #12366, #12367, #12368, #10492

[jdemeyer]

Description changed:

--- 
+++ 
@@ -1,3 +1,5 @@
 The aim is to add a gcc package to Sage.  We probably don't want to always build it, we would install it by default only on systems where this is needed.  This would replace the fortran package.
 
 **spkg**: [http://boxen.math.washington.edu/home/jdemeyer/spkg/gcc-4.4.6.spkg](http://boxen.math.washington.edu/home/jdemeyer/spkg/gcc-4.4.6.spkg)
+
+**Apply** [attachment: 12369_gcc_root.patch](https://github.com/sagemath/sage-prod/files/10654635/12369_gcc_root.patch.gz) to the `SAGE_ROOT` repository.

[jdemeyer]

Changed dependencies from #12366, #12367, #12368, #10492 to #11073, #12366, #12367, #12368, #10492, #12405

[kcrisman]

comment:7

# Install gcc if the system-provided one is older than gcc-4.4. 

But that is all Macs. This seems overkill to me; why not only do this on Lion?

Or would this eliminate having Xcode as a prerequisite to building Sage on OS X in general (even for those for which XCode is free, though sometimes annoying to get)? That might be a nice move. I assume this is a prebuilt gcc like our current Fortran package?

Could the message "installing GCC because..." occur several times here?

[vbraun]

comment:8

Updated spkg at http://www.stp.dias.ie/~vbraun/Sage/spkg/gcc-4.6.2.spkg

It turns out to be tricky to convince gcc to use lib64 for glibc but put its own libraries into lib. But I think its safe to just move the generated shared libraries to SAGE_LOCAL/lib. Also, I updated to the newest gcc, install in single-thread, and disabled multilib.

[jdemeyer]

comment:9

First of all: this spkg is all pretty-much proof-of-concept. I haven't even managed to install Sage from source with this spkg.

Replying to @kcrisman:

# Install gcc if the system-provided one is older than gcc-4.4. 

But that is all Macs. This seems overkill to me; why not only do this on Lion?

Maybe you are right, but my idea was to install this gcc spkg if the gcc we ship is more recent than the one the user has. I think many people would benefit from using a more recent compiler.

Or would this eliminate having Xcode as a prerequisite to building Sage on OS X in general (even for those for which XCode is free, though sometimes annoying to get)? That might be a nice move. I assume this is a prebuilt gcc like our current Fortran package?

No, this is a gcc from source. I certainly don't want to include gcc binaries for every platform, that would increase the size way too much.

Could the message "installing GCC because..." occur several times here?

Sure.

[kcrisman]

comment:10

First of all: this spkg is all pretty-much proof-of-concept. I haven't even managed to install Sage from source with this spkg.

Of course; I'm just asking early questions.

But that is all Macs. This seems overkill to me; why not only do this on Lion?

Maybe you are right, but my idea was to install this gcc spkg if the gcc we ship is more recent than the one the user has. I think many people would benefit from using a more recent compiler.

Possibly. I guess what I'm wondering is how one would build this gcc if one didn't have gcc... but this may betray my ignorance. Anyway, the vast majority of Mac users will not have a way to build this gcc if they need gcc until they download/install (from a disk which they've probably thrown out, as William pointed out on sage-devel) XCode anyway, in which case we might as well only worry about Lion anyway.

Or would this eliminate having Xcode as a prerequisite to building Sage on OS X in general (even for those for which XCode is free, though sometimes annoying to get)? That might be a nice move. I assume this is a prebuilt gcc like our current Fortran package?

No, this is a gcc from source. I certainly don't want to include gcc binaries for every platform, that would increase the size way too much.

That's what I figured, but just wanted to clarify.

Could the message "installing GCC because..." occur several times here?

Sure.

Ok. I suppose it doesn't really matter, but could be confusing/alarming.