gwaei is not currently using the default build flags set by dpkg-buildflags(1).
The default flags are chosen for multiple reasons including security,
performance, reproducibility, adherence to standards, and error handling.

Please make sure that gwaei builds using the default build flags. blhc(1p)
and hardening-check(1) can be used to confirm that the issue is fixed.

In the general case, packages honoring CFLAGS, LDFLAGS, and other
similar environment variables get the default build flags for free
without the need for any work on the maintainer side. In the case of
gwaei, the flags are either ignored or overridden.

The most common reasons for this are:

Hand-written Makefiles
----------------------
Some upstream Makefiles either override the values of variables such as
CFLAGS and similar or do not use them at all. See:
https://wiki.debian.org/HardeningWalkthrough#Handwritten_Makefiles

Misconfigured build systems
---------------------------
If the upstream code uses autotools, CMake, or other popular build
systems, it usually requires no further modifications. If might however
be that some variables are hardcoded in some way.

In this CMake snippet, the value of CXXFLAGS is overwritten with "-O2":

 set(CMAKE_CXX_FLAGS "-O2")

If the intention is to append to CXXFLAGS, one should use the following
instead:

 set(CMAKE_CXX_FLAGS "-O2 ${CMAKE_CXX_FLAGS}")

See #655870 for a similar autotools example.

Very old debhelper usage
------------------------
Packages not using dh(1), or those using a debhelper compatibility level
less than 9, need to manually include /usr/share/dpkg/buildflags.mk in
order for the dpkg-buildflags variables to be set:
https://wiki.debian.org/Hardening#dpkg-buildflags

Flags hardcoded in debian/rules (either voluntarily or not)
-----------------------------------------------------------
Some packages voluntarily hardcode the values of CFLAGS and friends in
debian/rules, ignoring the defaults set by dpkg-buildflags(1).

Others attempt to append to the variables, but end up accidentally
overriding the defaults:

 #!/usr/bin/make -f
 export CFLAGS += -pipe -fPIC -Wall

 %:
 	dh $@

Debhelper only sets CFLAGS if it is not set yet. In the example above,
when dh is invoked the value of CFLAGS is "-pipe -fPIC -Wall", hence the
hardened defaults are not used. The right way to append to CFLAGS is
using DEB_CFLAGS_MAINT_APPEND instead, as documented in
dpkg-buildflags(1).

For a detailed analysis of this issue, see:
https://people.debian.org/~ema/nocflags_paper.pdf (eprint: hal-05334704)

We believe that the bug you reported is fixed in the latest version of
gwaei, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1119440@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Andreas Tille <tille@debian.org> (supplier of updated gwaei package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Thu, 27 Aug 2026 14:26:52 +0200
Source: gwaei
Architecture: source
Version: 3.6.2-10
Distribution: unstable
Urgency: medium
Maintainer: Debian QA Group <packages@qa.debian.org>
Changed-By: Andreas Tille <tille@debian.org>
Closes: 1020670 1045028 1049714 1119440 1133349 1134268
Changes:
 gwaei (3.6.2-10) unstable; urgency=medium
 .
   [ Andreas Tille ]
   * QA upload.
   * Orphan package
     Closes: #1133349
   * Maintain package in Debian team on Salsa
   * Use Github repository as Homepage
     Closes: #1134268
   * Fix clean target
     Closes: #1045028
   * Bump debhelper from old 10 to 13.
   * Remove redundant Priority: optional from source stanza.
   * Replace FSF postal address with a reference to
https://www.gnu.org/licenses/.
   * Set debhelper-compat version in Build-Depends.
   * Set upstream metadata fields: Bug-Database, Name (from ./configure),
     Repository-Browse.
   * Build-Depends: libncurses5-dev => libncurses-dev,
     remove libncursesw5-dev
   * d/rules:
      - Short dh (Closes: #1049714)
      - do not override CFLAGS (Closes: #1119440)
      - hardening
   * d/copyright: DEP5
   * Add d/lrc.config
   * Remove d/menu since there is a desktop file
   * d/control:
      - distinct short descriptions
      - lib in Section libs
      - No explicit Build-Depends from dpkg-dev needed
   * DEP3
   * Add watch file pointing to latest Git commit to advertise
     continued development but leave upgrading to people who know
     this program better
   * Standards-Version: 4.7.4
   * Remove unused lintian-overrides
 .
   [ Vagrant Cascadian ]
   * Add -ffile-prefix-map to CFLAGS
     Closes: #1020670
Checksums-Sha1:
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 3d6f4a2137655cd5b12bf44b94babbd3daee1efc 6008 gwaei_3.6.2-10.debian.tar.xz
 cc8c41d3268994b697ae8ca42d58f05572216430 18323 gwaei_3.6.2-10_amd64.buildinfo
Checksums-Sha256:
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 d33b9cb634c46ee03a4227ff7373288fc86cf609f9773ea6f41186b45607222d 6008 gwaei_3.6.2-10.debian.tar.xz
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Files:
 74be7912ae2cb04934b395068a0ef271 2108 gnome optional gwaei_3.6.2-10.dsc
 5ff9ff11e8ca704ee2c346d12d0201ad 6008 gnome optional gwaei_3.6.2-10.debian.tar.xz
 c3938ae41382f14a02a72b909cf7254c 18323 gnome optional gwaei_3.6.2-10_amd64.buildinfo
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