How to update a package?

[evandrocoan]

I come here from transcode-open#22 where they said this support package upgrade, but they did not said how it can upgrade a package.

Look at help, I can only find a option to upgrade all packages:

  dist-upgrade             : to upgrade all packages that is installed.
                             This subcommand uses setup.exe

Currently I have gcc 7.3 instead, but I just saw there is gcc 8 available: https://cygwin.com/packages/summary/gcc-g++.html

What is the command to update gcc from 7.3 to 8?

I already tried just running apt-cyg install gcc-g++, but the gcc version still the same:

Professional@PROFESSIONAL-PC$ apt-cyg install gcc-g++

Cache directory is /.pkg-cache
Mirror is http://cygwin.mirror.constant.com
Updating setup.ini
--2019-12-26 23:17:28--  http://cygwin.mirror.constant.com/x86_64/setup.bz2
Resolving cygwin.mirror.constant.com (cygwin.mirror.constant.com)... 108.61.5.83
Connecting to cygwin.mirror.constant.com (cygwin.mirror.constant.com)|108.61.5.83|:80... connected.
HTTP request sent, awaiting response... 304 Not Modified
File ‘setup.bz2’ not modified on server. Omitting download.

--2019-12-26 23:17:28--  http://cygwin.mirror.constant.com/x86_64/setup.bz2.sig
Resolving cygwin.mirror.constant.com (cygwin.mirror.constant.com)... 108.61.5.83
Connecting to cygwin.mirror.constant.com (cygwin.mirror.constant.com)|108.61.5.83|:80... connected.
HTTP request sent, awaiting response... 304 Not Modified
File ‘setup.bz2.sig’ not modified on server. Omitting download.

gpg: assuming signed data in `setup.bz2'
gpg: Signature made Thu, Dec 26, 2019 19:15:06 ESAST using DSA key ID 676041BA
gpg: Good signature from "Cygwin <[email protected]>"
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 1169 DF9F 2273 4F74 3AA5  9232 A9A2 62FF 6760 41BA
signature verified: setup.bz2.sig
--2019-12-26 23:17:30--  http://cygwin.mirror.constant.com/x86_64/setup.ini
Resolving cygwin.mirror.constant.com (cygwin.mirror.constant.com)... 108.61.5.83
Connecting to cygwin.mirror.constant.com (cygwin.mirror.constant.com)|108.61.5.83|:80... connected.
HTTP request sent, awaiting response... 200 OK
Server ignored If-Modified-Since header for file ‘setup.ini’.
You might want to add --no-if-modified-since option.

--2019-12-26 23:17:30--  http://cygwin.mirror.constant.com/x86_64/setup.ini.sig
Resolving cygwin.mirror.constant.com (cygwin.mirror.constant.com)... 108.61.5.83
Connecting to cygwin.mirror.constant.com (cygwin.mirror.constant.com)|108.61.5.83|:80... connected.
HTTP request sent, awaiting response... 304 Not Modified
File ‘setup.ini.sig’ not modified on server. Omitting download.

gpg: assuming signed data in `setup.ini'
gpg: Signature made Thu, Dec 26, 2019 19:15:01 ESAST using DSA key ID 676041BA
gpg: Good signature from "Cygwin <[email protected]>"
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 1169 DF9F 2273 4F74 3AA5  9232 A9A2 62FF 6760 41BA
signature verified: setup.ini.sig
Updated setup.ini
Package gcc-g++ is already installed, skipping
Professional@PROFESSIONAL-PC$

[kou1okada]

This question will be resolved with my answer at issue #48.

The latest version of gcc-g++(version 8.3.0-1) is in the [test] section not [curr].
But, I'm sorry, apt-cyg does not support selecting a section for install subcommand, yet.
Thus, you can not install it with apt-cyg directly.

However, you can resolve it with the least cost by using setup subcommand and a few GUI operations.

1. Run below command:

apt-cyg setup -- -q -B -M -n -x gcc-g++ -P gcc-g++

2. Click Reinstall and select 8.3.0-1 (Test) from pop up menu.
   
3. Click Next button to finish install.

If you want to check the section which packages are belongs, use describe subcommand as following:

$ apt-cyg -u describe gcc-g++
Cache directory is /cygdrive/c/Users/kou/Downloads/cygwin
Mirror is http://ftp.jaist.ac.jp/pub/cygwin
@ gcc-g++
sdesc: "GNU Compiler Collection (C++)"
ldesc: "The GNU Compiler Collection includes front ends for C, C++,
Objective-C, Fortran, Ada, and Go, as well as libraries for these
languages (libstdc++, libgcj,...)."
category: Devel
requires: cygwin gcc-core libgmp10 libiconv2 libintl8 libisl15 libmpc3 libmpfr6 libstdc++6 zlib0
version: 7.4.0-1
install: x86_64/release/gcc/gcc-g++/gcc-g++-7.4.0-1.tar.xz 12405804 7bd7861622c214710da4b3ff3304eb22b8c05c595f343610750a44bf5826ec27a4cd37623cfa20d48f40d07055b1a2e33eb0bab158fecef2e7fce310fb2e29a8
source: x86_64/release/gcc/gcc-7.4.0-1-src.tar.xz 62627316 28c56fb6c6b2b1e2248bac49d5cfa96bc48d9ba7f473e07a54f43e63f3aafeacb6acf6b2a139e9f01926551d4c0fdecae9c46d864599b24b6c0f4763a72321f9
depends2: cygwin, gcc-core, libgmp10, libiconv2, libintl8, libisl15, libmpc3, libmpfr6, libstdc++6, zlib0
[prev]
version: 7.3.0-3
install: x86_64/release/gcc/gcc-g++/gcc-g++-7.3.0-3.tar.xz 12379576 390d58d363c5eef45b796f6a20e784a81700a04b588a7af599fc95cff7fa6d35a99f350fd96c7430e18a5aa0df774fb225bac759958396c2fbe398b09e5d9a90
source: x86_64/release/gcc/gcc-7.3.0-3-src.tar.xz 62487856 cf93db46b32dce73ddc4b44ad253405ebfa16937340f0e59f7f0ddf0e2397faea6092c173d03f53b401d63e34e9a6b8d2f2911013dbb5d6dd146af1e84d61a07
depends2: cygwin, gcc-core, libgmp10, libiconv2, libintl8, libisl15, libmpc3, libmpfr6, libstdc++6, zlib0
[test]
version: 8.3.0-1
install: x86_64/release/gcc/gcc-g++/gcc-g++-8.3.0-1.tar.xz 15720920 902cb94cc224e98fba2b12429d7fc7a36329c139c124300dc730a04307228ef4e2f7f9fa7958ef8ac2ee12a991f5678f36046291c2569b53a91d6b9b02970adc
source: x86_64/release/gcc/gcc-8.3.0-1-src.tar.xz 63717648 d1bd8497bbda3e97413a33e71c3e13ee0c9eff3f610e219b99aac0a97a7a850c6204cd1c8d8579a85ddbfd81a1f20a5dc929dc09ddce5d88130c8d526715ce39
depends2: cygwin, gcc-core, libgmp10, libiconv2, libintl8, libisl15, libmpc3, libmpfr6, libstdc++6, zlib0

[evandrocoan]

Thanks for the detailed answer!

[charlescanato]

Out of curiosity, this is nice when you need to select a specific version, since this is still not supported.

But, when you want to upgrade, isn't it "easier" to just remove and then install the package again?

I'd also love a one-package update feature, but so far, it seems to me that sticking to the command-line is still faster.