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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id l14sm777478edq.35.2021.01.13.04.26.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 13 Jan 2021 04:26:36 -0800 (PST) To: =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= References: <20210107140039.467969-1-pbonzini@redhat.com> <20210107140039.467969-9-pbonzini@redhat.com> <20210113103143.GA1568240@redhat.com> From: Paolo Bonzini Subject: Re: [PATCH 8/8] configure: automatically parse command line for meson -D options Message-ID: <4acc194b-04cd-3276-3cb9-44b133095bee@redhat.com> Date: Wed, 13 Jan 2021 13:26:35 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <20210113103143.GA1568240@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=63.128.21.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.25, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: marcandre.lureau@redhat.com, alex.bennee@linaro.org, qemu-devel@nongnu.org, stefanha@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 13/01/21 11:31, Daniel P. Berrangé wrote: >> >> - because we need to run the script to generate the full help, we >> cannot rely on the user supplying the path to a Python interpreter >> with --python. For this reason, the script is written in Perl. >> Perl 5 is universally available as "/usr/bin/env perl", while >> (even ignoring the Python 2/3 difference) some systems do not >> have a "python" or "python3" binary on the path. > > Can't we just use "/usr/bin/env python3", and if that doesn't > exist in $PATH, simply show truncated --help output, with a > message requesting that they pass --python to see full help. We can and it's what the RFC did, but I found it to be ugly for the user. For example the rest of the build defaults not to "/usr/bin/env python3" but to whatever Python interpreter /usr/bin/meson uses. Not that Perl is pretty, :) but developer ugliness ranks a notch lower than user-visible ugliness. I cannot think of anything else that is already required to build QEMU and can parse JSON. I don't expect this script to see any change ever, except for occasionally updating SKIP_OPTIONS. Meson introspection data is backwards-compatible. Paolo