Package: dpkg
Version: 1.19.7
Severity: normal

Dear Maintainer,

I use dpkg-buildflags in my continuous integration script, to make
sure my software (rdfind, available in debian) will build ok when the official
rdfind package is built. I count the warnings during build, and error out if
it is nonzero. This works fine in buster.

This will however fail with g++-9, which warns when using 
on C++ programs.

To reproduce:
export DEB_BUILD_MAINT_OPTIONS="qa=+all"
touch empty.cpp
g++-9 $(dpkg-buildflags --get CXXFLAGS) -c empty.cpp
# outputs a warning from g++

Reading the manpage for dpkg-buildflags, it says CXXFLAGS is the same as 
CFLAGS. I think
that is unfortunate. I would expect CXXFLAGS to be C++ specific.


-- Package-specific info:
System tainted due to merged-usr-via-symlinks.

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 5.2.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=sv_SE.UTF-8, LC_CTYPE=sv_SE.UTF-8 (charmap=UTF-8), 
LANGUAGE=sv_SE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages dpkg depends on:
ii  libbz2-1.0   1.0.6-9.2
ii  libc6        2.28-10
ii  liblzma5     5.2.4-1+b1
ii  libselinux1  2.9-2+b2
ii  tar          1.30+dfsg-6+b1
ii  zlib1g       1:1.2.11.dfsg-1+b1

dpkg recommends no packages.

Versions of packages dpkg suggests:
ii  apt            1.8.3
pn  debsig-verify  <none>

-- no debconf information

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