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[Octave-bug-tracker] [bug #56505] setting CXX should affect mkoctfile li
From: |
Mike Miller |
Subject: |
[Octave-bug-tracker] [bug #56505] setting CXX should affect mkoctfile link stage as well |
Date: |
Sun, 16 Jun 2019 14:07:41 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.90 Safari/537.36 |
URL:
<https://savannah.gnu.org/bugs/?56505>
Summary: setting CXX should affect mkoctfile link stage as
well
Project: GNU Octave
Submitted by: mtmiller
Submitted on: Sun 16 Jun 2019 11:07:39 AM PDT
Category: Configuration and Build System
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Feature Request
Status: None
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: dev
Operating System: GNU/Linux
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Details:
The mkoctfile program uses a separate non-standard internal variable for the
name of the linker program to call when building oct files, and a separate
one for the name of the linker to use when building standalone programs.
I think that setting the CXX variable should also override the name of the
linker. If we still want the user to be able to set both the compiler and
linker independently, we should use a more standard variable name, either
something like LD or CXXLD.
Example of current behavior
>> mkoctfile -v dummy.cc
g++ -c -fPIC -I… -pthread -fopenmp -g -O2 dummy.cc -o /tmp/oct-Cwseid.o
g++ -I… -pthread -fopenmp -g -O2 -shared -Wl,-Bsymbolic -o dummy.oct
/tmp/oct-Cwseid.o
>>
>> setenv CXX clang
>> mkoctfile -v dummy.cc
clang -c -fPIC -I… -pthread -fopenmp -g -O2 dummy.cc -o /tmp/oct-MCpC7P.o
g++ -I… -pthread -fopenmp -g -O2 -shared -Wl,-Bsymbolic -o dummy.oct
/tmp/oct-MCpC7P.o
It would be more user friendly if the second command shown, the link stage,
also used clang by virtue of the user setting CXX. Currently the user has to
know about the special Octave environment variable 'DL_LD'.
As far as I can tell, 'DL_LD' is always set to the same thing as 'CXX' when
Octave is built. So is the 'LD_CXX' variable. These two linker variables look
redundant to me and I think we could combine them into one.
_______________________________________________________
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Mike Miller <=