Allow setting build vars manually

[the-eater]

Currently Linenoise fails to build with:

===> Searching for: Task::Star
===> Searching for missing dependencies: Debugger::UI::CommandLine, ufo, XML::Writer, SVG, SVG::Plot, Terminal::ANSIColor, Test::Mock, Grammar::Profiler::Simple, Grammar::Debugger, JSON::Tiny, Digest::MD5, panda, HTTP::Status, HTTP::Easy, Template::Mojo, DBIish, URI
, Linenoise, LWP::Simple, JSON::RPC, Pod::To::HTML, p6doc, MIME::Base64, PSGI, Shell::Command, File::Find
===> Searching for missing dependencies: JSON::Fast, File::Which, OO::Monitors, NativeHelpers::Blob, LibraryMake, File::Temp, Pod::To::BigPage, IO::String
===> Searching for missing dependencies: IO::Socket::SSL, File::Directory::Tree
===> Searching for missing dependencies: OpenSSL
===> Building: Linenoise:ver('0.1.1'):auth('Rob Hoelz')
gcc: error: /void-packages/common/environment/configure/gccspecs/hardened-cc1: No such file or directory
make: *** [Makefile:12: linenoise.o] Error 1
The spawned command 'make' exited unsuccessfully (exit code: 2)
  in block <unit> at -e line 1

===> Building [FAIL]: Linenoise:ver('0.1.1'):auth('Rob Hoelz')
Aborting due to build failure: Linenoise:ver('0.1.1'):auth('Rob Hoelz')(use --force to override)
  in code  at /home/eater/.perl6/sources/4B1D5A60B59D9541E13F76E0E2A2D550E0144053 (Zef::Client) line 306
  in method build at /home/eater/.perl6/sources/4B1D5A60B59D9541E13F76E0E2A2D550E0144053 (Zef::Client) line 271
  in sub  at /home/eater/.perl6/sources/4B1D5A60B59D9541E13F76E0E2A2D550E0144053 (Zef::Client) line 489
  in method install at /home/eater/.perl6/sources/4B1D5A60B59D9541E13F76E0E2A2D550E0144053 (Zef::Client) line 600
  in sub MAIN at /home/eater/.perl6/sources/09969B10D9F270B8DBAAB9961FA7E6CDB8AD58C9 (Zef::CLI) line 139
  in block <unit> at /home/eater/.perl6/resources/85BD232410222F167A35B9969B036802FECD78D2 line 1

Context

I'm trying to build Noiseline this uses to build the C code LibraryMake, and this in turn uses the CFLAGS which were used to build VM. which are not applicable to my current environment. (VM is in this case built on a build server)

Expected Behavior

It would fail, but allow me to set CFLAGS within zef for Builders to use. most preffered way is via an static file

I understand this is currently a problem in LibraryMake then zef but it would be nice if this was globally solved

Actual Behavior

I need to edit LibraryMake to actually build things with it.

Steps to Reproduce

1. touch /tmp/foo
2. build and install MoarVM with CFLAGS=-specs=/tmp/foo
3. remove /tmp/foo
4. do zef install Noiseline

Build log (with --debug):

===> Searching for: Linenoise
===> Found: Linenoise:ver('0.1.1'):auth('Rob Hoelz')
===> Dependencies: LibraryMake
===> Searching for missing dependencies: LibraryMake
===> Found dependencies: LibraryMake:ver('1.0.0'):auth('github:retupmoca')
===> Dependencies: Shell::Command
===> Searching for missing dependencies: Shell::Command
===> Found dependencies: Shell::Command
===> Dependencies: File::Which, File::Find, Test
===> Searching for missing dependencies: File::Which, File::Find
===> Found dependencies: File::Find:ver('0.1'), File::Which
===> Dependencies: Test
===> Filtering: Linenoise:ver('0.1.1'):auth('Rob Hoelz')
===> Filtering [OK] for Linenoise:ver('0.1.1'):auth('Rob Hoelz')
===> Filtering: LibraryMake:ver('1.0.0'):auth('github:retupmoca')
===> Filtering [OK] for LibraryMake:ver('1.0.0'):auth('github:retupmoca')
===> Filtering: Shell::Command
===> Filtering [OK] for Shell::Command
===> Filtering: File::Find:ver('0.1')
===> Filtering [OK] for File::Find:ver('0.1')
===> Filtering: File::Which
===> Filtering [OK] for File::Which
===> # SKIP: No Build.pm for File::Which
===> # SKIP: No Build.pm for File::Find:ver('0.1')
===> # SKIP: No Build.pm for Shell::Command
===> # SKIP: No Build.pm for LibraryMake:ver('1.0.0'):auth('github:retupmoca')
===> Building: Linenoise:ver('0.1.1'):auth('Rob Hoelz')
Building with plugin: Zef::Service::Shell::Build+{<anon|94297161014400>}
Command: /usr/bin/perl6 -Ilib -I. -MBuild -I/home/eater/.zef/store/P6-LibraryMake.git/cb5bd3417f5fc812a9957d35a7df2b2bcf9a621c/lib -I/home/eater/.zef/store/Shell-Command.git/59b736a276823957f655d76ff994324ea5357898/lib -I/home/eater/.zef/store/perl6-file-which.git/4
4549a485798f1e3c4c2fbb1aececf02ee517b6a/lib -I/home/eater/.zef/store/File-Find.git/075720bde467460892fd3e326e139a9a926cbc8a/lib -e ::('Build').new.build('/home/eater/.zef/store/p6-linenoise.git/5ad368972e724bfd0921a1c610c2ffd04b389841'); exit(0);                    gcc -c -fPIC -Wdeclaration-after-statement -Werror=declaration-after-statement -O3 -DNDEBUG  -D_REENTRANT -D_FILE_OFFSET_BITS=64 -fPIC -specs=/void-packages/common/environment/configure/gccspecs/hardened-cc1  -fstack-protector-strong -D_FORTIFY_SOURCE=2 -mtune=gener
ic -O2 -pipe        -o  linenoise.o linenoise.c                                                                                                                                                                                                                           gcc: error: /void-packages/common/environment/configure/gccspecs/hardened-cc1: No such file or directory
make: *** [Makefile:12: linenoise.o] Error 1
The spawned command 'make' exited unsuccessfully (exit code: 2)
  in block <unit> at -e line 1

===> Building [FAIL]: Linenoise:ver('0.1.1'):auth('Rob Hoelz')
Aborting due to build failure: Linenoise:ver('0.1.1'):auth('Rob Hoelz')(use --force to override)
  in code  at /home/eater/.perl6/sources/4B1D5A60B59D9541E13F76E0E2A2D550E0144053 (Zef::Client) line 306
  in method build at /home/eater/.perl6/sources/4B1D5A60B59D9541E13F76E0E2A2D550E0144053 (Zef::Client) line 271
  in sub  at /home/eater/.perl6/sources/4B1D5A60B59D9541E13F76E0E2A2D550E0144053 (Zef::Client) line 489
  in method install at /home/eater/.perl6/sources/4B1D5A60B59D9541E13F76E0E2A2D550E0144053 (Zef::Client) line 600
  in sub MAIN at /home/eater/.perl6/sources/09969B10D9F270B8DBAAB9961FA7E6CDB8AD58C9 (Zef::CLI) line 139
  in block <unit> at /home/eater/.perl6/resources/85BD232410222F167A35B9969B036802FECD78D2 line 1

Your Environment

• perl6 -v

This is Rakudo version 2017.03 built on MoarVM version 2017.03
implementing Perl 6.c.

• perl6 -e 'say $*VM.config'

linux

[ugexe]

As you mentioned this is outside the scope of zef, although ultimately yes it should become globally solved via some build module which zef can use.

The Perl6 world currently uses Build.pm as our temporary solution to build hooks. For instance: https://github.com/hoelzro/p6-linenoise/blob/master/Build.pm (which can be run without a module installer). Unfortunately this means it is up to module authors to handle the problem.

As a workaround you can do something like:
zef look Linenoise
zef --depsonly install .
vi Build.pm # make appropriate edits
zef --debug install .

[ugexe]

Here is a proposed solution to this issue: https://github.com/perl6/toolchain-bikeshed/blob/master/build.md