[Bug 2071468] [NEW] ELF package metadata failure: environment variable ‘DEB_HOST_ARCH’ not defined

[Benjamin Drung]

Public bug reported:

The ELF package note metadata introduced in dpkg 1.22.6ubuntu11 (refined
in 1.22.6ubuntu14) can cause this failure:

```
gcc fatal error: environment variable ‘DEB_HOST_ARCH’ not defined
```

This happens when the `-specs=/usr/share/dpkg/elf-package-
metadata.specs` parameter is set but the needed environment variables
are not set. Cases:

1. Only the LDFLAGS is queried from dpkg-buildflags. Affected source
packages builds: python3.12, openjdk-21, cdbs (causing dvbstreamer and
rp-pppoe fail to build)

2. autopkgtests

** Affects: dpkg (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  The ELF package note metadata introduced in dpkg 1.22.6ubuntu11 (refined
  in 1.22.6ubuntu14) can cause this failure:
  
  ```
  gcc fatal error: environment variable ‘DEB_HOST_ARCH’ not defined
  ```
  
- This happens when the -spec parameter is set but the needed environment
- variables are not set. Cases:
+ This happens when the `-specs=/usr/share/dpkg/elf-package-
+ metadata.specs` parameter is set but the needed environment variables
+ are not set. Cases:
  
  1. Only the LDFLAGS is queried from dpkg-buildflags. Affected source
  packages builds: python3.12, openjdk-21, cdbs (causing dvbstreamer and
  rp-pppoe fail to build)
  
  2. autopkgtests

** Summary changed:

- ELF package metadata failures
+ ELF package metadata failure: environment variable ‘DEB_HOST_ARCH’ not defined

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https://bugs.launchpad.net/bugs/2071468

Title:
  ELF package metadata failure: environment variable ‘DEB_HOST_ARCH’ not
  defined

Status in dpkg package in Ubuntu:
  New

Bug description:
  The ELF package note metadata introduced in dpkg 1.22.6ubuntu11
  (refined in 1.22.6ubuntu14) can cause this failure:

  ```
  gcc fatal error: environment variable ‘DEB_HOST_ARCH’ not defined
  ```

  This happens when the `-specs=/usr/share/dpkg/elf-package-
  metadata.specs` parameter is set but the needed environment variables
  are not set. Cases:

  1. Only the LDFLAGS is queried from dpkg-buildflags. Affected source
  packages builds: python3.12, openjdk-21, cdbs (causing dvbstreamer and
  rp-pppoe fail to build)

  2. autopkgtests

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