./configure CC=/path/to/gcc ...

[mkoeppe]

Standard autotools packages allow variables such as CC to be set at configure time using

./configure CC=/path/to/gcc

In this ticket, we add support for this. (The syntax already works, but the settings right now only end up in the unused file build/make/Makefile-auto.)

New configure tarball:
https://github.com/sagemath/sage/files/ticket22646/configure-235.tar.gz

CC: @jdemeyer @kiwifb

Component: build

Author: François Bissey

Branch: 99eb31f

Reviewer: Matthias Koeppe, Jeroen Demeyer, Vincent Delecroix, John Palmieri, Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/22646

[kiwifb]

comment:2

I guess that should be extended to CXX, FC, possibly F77 and CPP (although I actually don't recommend to set that one and let the package decides unless it require hand holding. That's from my experience setting it in sage-env that sometimes backfire because $CC -E may work slightly differently and is what many package assume instead of plain cpp.

Would that need to over-ride sage-env if sage's gcc has been installed? Useful for mad scientist experiments but probably not for common users.

[mkoeppe]

comment:3

Yes, all of CC, CXX, FC, etc.
As a guideline, one can look into the list of variables that appear in an automake-generated Makefile.

In my opinion, if the user provides a specific CC, CXX in this way and configure finds out that they are not suitable, that should be an error.

A gcc package should only be installed if no CC, CXX were provided in this way by the user.
Only in that case, sage-env should do its special magic to set these variables to have the sage gcc used.

[kiwifb]

comment:4

OK, past experience shows that if you set something special at build time, it is forgotten at runtime (see #21701) so we will need to leverage sage-env-config, considering the magic in sage-env that means moving quite a bit of stuff.

[mkoeppe]

comment:5

Yes, sage-env-config is what needs to be used.

[kiwifb]

Author: François Bissey

[kiwifb]

Branch: u/fbissey/compilers

[kiwifb]

comment:6

This is a first draft for this. I am dropping the setting for CPP. If there are packages, not using autotools, that need it to be set, I'll reconsider.

---

New commits:

483106a

First draft of moving compiler settings to sage-env-config

[kiwifb]

Commit: 483106a

[kiwifb]

comment:7

OK I am looking to make #12426 on this soon and rework slightly the toolchain building in the case were we only build gfortran. In the absence of further comments, I am putting this for review. I'll attach a configure tarball.

[kiwifb]

Description changed:

--- 
+++ 
@@ -5,3 +5,6 @@
 ```
 In this ticket, we add support for this -- and probably also for all SAGE_... variables listed in the installation manual. (The syntax already works, but the settings right now only end up in the unused file `build/make/Makefile-auto`.)
 
+New configure tarball:
+[https://github.com/sagemath/sage/files/ticket22646/configure-222.tar.gz
+

[kiwifb]

Description changed:

--- 
+++ 
@@ -6,5 +6,5 @@
 In this ticket, we add support for this -- and probably also for all SAGE_... variables listed in the installation manual. (The syntax already works, but the settings right now only end up in the unused file `build/make/Makefile-auto`.)
 
 New configure tarball:
-[https://github.com/sagemath/sage/files/ticket22646/configure-222.tar.gz
+[https://github.com/sagemath/sage/files/ticket22646/configure-222.tar.gz](https://github.com/sagemath/sage/files/ticket22646/configure-222.tar.gz)
 

[sagetrac-git]

Changed commit from 483106a to 945e824

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

d6e87c8	Merge branch 'develop' into compiler
6048dff	Forgot to commit the new configure tarball
f7eff64	Merge branch 'develop' into compiler
945e824	bump config tarball

[kiwifb]

Description changed:

--- 
+++ 
@@ -6,5 +6,5 @@
 In this ticket, we add support for this -- and probably also for all SAGE_... variables listed in the installation manual. (The syntax already works, but the settings right now only end up in the unused file `build/make/Makefile-auto`.)
 
 New configure tarball:
-[https://github.com/sagemath/sage/files/ticket22646/configure-222.tar.gz](https://github.com/sagemath/sage/files/ticket22646/configure-222.tar.gz)
+[https://github.com/sagemath/sage/files/ticket22646/configure-226.tar.gz](https://github.com/sagemath/sage/files/ticket22646/configure-226.tar.gz)