Can't build on non-default version of gcc

We’re trying to build a package with gcc 4.9. The system has versions 4.8, 4.8, 6.3 (default).

if __name__ == "__main__":
    builder = ConanMultiPackager(
    reference="switcher/0.4",
    upload=True,
    remote="barbarian")
    builder.add({"os": "Linux", "compiler": "gcc", "compiler.libcxx": "libstdc++", "compiler.version": "4.9", "build_type": "Debug", "arch": "x86"})
    builder.add({"os": "Linux", "compiler": "gcc", "compiler.libcxx": "libstdc++", "compiler.version": "4.9", "build_type": "Debug", "arch": "x86_64"})
    builder.run()

It seems to be the first time you've ran conan
Auto detecting your dev setup to initialize conan.conf
Found gcc 6.3
Default conan.conf settings
    os=Linux
    arch=x86_64
    compiler=gcc
    compiler.version=6.3
    compiler.libcxx=libstdc++
    build_type=Release
*** You can change them in ~/.conan/conan.conf ***
*** Or override with -s compiler='other' -s ...s***


WARN: Conanfile doesn't have 'url'.
It is recommended to add it as attribute
WARN: Conanfile doesn't have 'license'.
It is recommended to add it as attribute
WARN: Conanfile doesn't have 'description'.
It is recommended to add it as attribute
switcher/0.4@paulius/switcher_program: A new conanfile.py version was exported
switcher/0.4@paulius/switcher_program: Folder: /home/parallels/.conan/data/switcher/0.4/paulius/switcher_program/export
PROJECT: WARN: config() has been deprecated. Use config_options and configure
switcher/0.4@PROJECT
WARN: Remotes registry file missing, creating default one in /home/parallels/.conan/registry.txt

############## CONAN PACKAGE TOOLS ######################

DEBUG: - Skipped build, compiler mismatch: {'os': 'Linux', 'compiler.version': '4.9', 'compiler.libcxx': 'libstdc++', 'arch': 'x86', 'build_type': 'Debug', 'compiler': 'gcc'}

#########################################################


############## CONAN PACKAGE TOOLS ######################

DEBUG: - Skipped build, compiler mismatch: {'os': 'Linux', 'compiler.version': '4.9', 'compiler.libcxx': 'libstdc++', 'arch': 'x86_64', 'build_type': 'Debug', 'compiler': 'gcc'}

#########################################################

It looks like conan found the default compiler and is sticking with it. How can we make it recognise other versions? We could define the CXX variable or change the settings, but we’re going to be doing multi-compiler builds pretty soon, and ConanMultiPackager seems like our best bet here.

[solvingj]

Since a built-in filter never got implemented, the manual way isn’t terrible using python’s filter function. Something like this:

builder.items = filter(lambda build: build.os == platform.system(), builder.items)

[lasote]

Looks good! maybe we could add it to the docs