[Bug 2016042] Re: Please add -D_GLIBCXX_ASSERTIONS to default build flags

[Mark Esler]

** Description changed:

- This flag has a long history of distro use in Fedora [0] and is used
- by Gentoo [1].
+ > The _GLIBCXX_ASSERTIONS macro defines a subset of the _GLIBCXX_DEBUG
+ > checks, with no impact on class layout and minimal impact on runtime
+ > (and no changes in algorithmic complexity). It is intended to be
+ > suitable for both debug builds and release builds. [1]
  
  _GLIBCXX_ASSERTIONS was developed not to impact ABI or big-O complexity.
  
- > The _GLIBCXX_ASSERTIONS macro defines a subset of the _GLIBCXX_DEBUG
- > checks, with no impact on class layout and minimal impact on runtime
- > (and no changes in algorithmic complexity). It is intended to be
- > suitable for both debug builds and release builds.
- [2]
+ Distros which use this flag include Fedora (2018), Arch Linux (2021)
+ Gentoo Hardened (2022), Alpine (2023), and OpenSUSE [1].
  
- As with -D_FORTIFY_SOURCE=3, poor quality code requires more mitigations
- and therefore have higher performance penalties.
- 
- When Fedora initially added this default flag some packages FTBFS. Now
- packages appear stable.
- 
- [0] https://src.fedoraproject.org/rpms/redhat-rpm-config/c/0d162176e9dba1adc330a9ee561b91c8e5e62cb5
- [1] https://bugs.gentoo.org/876895
- [2] https://bugs.launchpad.net/kicad/+bug/1838448/comments/40
+ [0] https://bugs.launchpad.net/kicad/+bug/1838448/comments/40
+ [1] https://github.com/jvoisin/compiler-flags-distro

** Also affects: gcc-13 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: gcc-13 (Ubuntu)
   Importance: Undecided => High

** Changed in: gcc-13 (Ubuntu)
    Milestone: None => ubuntu-24.04

** Description changed:

  > The _GLIBCXX_ASSERTIONS macro defines a subset of the _GLIBCXX_DEBUG
  > checks, with no impact on class layout and minimal impact on runtime
  > (and no changes in algorithmic complexity). It is intended to be
- > suitable for both debug builds and release builds. [1]
+ > suitable for both debug builds and release builds. [0]
  
  _GLIBCXX_ASSERTIONS was developed not to impact ABI or big-O complexity.
  
  Distros which use this flag include Fedora (2018), Arch Linux (2021)
  Gentoo Hardened (2022), Alpine (2023), and OpenSUSE [1].
  
  [0] https://bugs.launchpad.net/kicad/+bug/1838448/comments/40
  [1] https://github.com/jvoisin/compiler-flags-distro

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https://bugs.launchpad.net/bugs/2016042

Title:
  Please add -D_GLIBCXX_ASSERTIONS to default build flags

Status in dpkg package in Ubuntu:
  New
Status in gcc-12 package in Ubuntu:
  New
Status in gcc-13 package in Ubuntu:
  New

Bug description:
  > The _GLIBCXX_ASSERTIONS macro defines a subset of the _GLIBCXX_DEBUG
  > checks, with no impact on class layout and minimal impact on runtime
  > (and no changes in algorithmic complexity). It is intended to be
  > suitable for both debug builds and release builds. [0]

  _GLIBCXX_ASSERTIONS was developed not to impact ABI or big-O
  complexity.

  Distros which use this flag include Fedora (2018), Arch Linux (2021)
  Gentoo Hardened (2022), Alpine (2023), and OpenSUSE [1].

  [0] https://bugs.launchpad.net/kicad/+bug/1838448/comments/40
  [1] https://github.com/jvoisin/compiler-flags-distro

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