[Debian-astro-maintainers] Bug#915263: montage FTCBFS: insane build system

[Helmut Grohne]

Source: montage
Version: 6.0+dfsg-2
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap

montage fails to cross build from source, because its build system is
insane. Part of that is already reported as #915163, but there are two
other aspects that stick:

 * It tends to stuff compiler flags into the CC variable. When
   dh_auto_build supplies CC, those flags get lost. It is much better to
   store them in CFLAGS.
 * While it uses $(CC) most of the time, it hard codes gcc in a few
   places, so dh_auto_build has now way of substituting the compiler.

The attached patch fixes these aspects while still leaving the failure
propagation (#915163) as is. The patch makes montage cross build
successfully. In the presence of #915163, I cannot quite tell whether
that's enough. Please consider applying it.

Helmut
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