[scalapack] 03/04: debian/rules: conditionally define Debian variables using ?=

[Drew Parsons]

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dparsons pushed a commit to tag debian/2.0.2-4
in repository scalapack.

commit 2d8dcdf87a1d847abf6e87c0f9dadb452187d701
Author: Drew Parsons <dparsons at debian.org>
Date:   Fri Dec 1 01:15:01 2017 +0800

    debian/rules: conditionally define Debian variables using ?=
    
    affects DEB_HOST_MULTIARCH DEB_HOST_ARCH DEB_BUILD_ARCH_OS
---
 debian/changelog | 1 +
 debian/rules     | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/debian/changelog b/debian/changelog
index b4e6b2c..75afc28 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -5,6 +5,7 @@ scalapack (2.0.2-5) UNRELEASED; urgency=medium
     causes tests to fail. So strip it from LDFLAGS.
     Thanks Steve Langasek. Closes: #883042.
   * Priority: optional not extra.
+  * debian/rules: conditionally define Debian build variables using ?=
 
  -- Drew Parsons <dparsons at debian.org>  Fri, 01 Dec 2017 00:01:01 +0800
 
diff --git a/debian/rules b/debian/rules
index 6a1ef7b..a205021 100755
--- a/debian/rules
+++ b/debian/rules
@@ -6,9 +6,9 @@ export DEB_CFLAGS_MAINT_APPEND  = -Wall -pedantic
 export DEB_CXXFLAGS_MAINT_APPEND  = -Wall -pedantic
 export DEB_LDFLAGS_MAINT_APPEND = -Wl,--as-needed
 export DEB_LDFLAGS_MAINT_STRIP = -Wl,-Bsymbolic-functions
-export DEB_HOST_MULTIARCH := $(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
-export DEB_HOST_ARCH := $(shell dpkg-architecture -qDEB_HOST_ARCH)
-export DEB_BUILD_ARCH_OS := $(shell dpkg-architecture -qDEB_BUILD_ARCH_OS)
+export DEB_HOST_MULTIARCH ?= $(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
+export DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH)
+export DEB_BUILD_ARCH_OS ?= $(shell dpkg-architecture -qDEB_BUILD_ARCH_OS)
 
 ifneq (,$(wildcard /usr/share/mpi-default-dev/debian_defaults))
 include /usr/share/mpi-default-dev/debian_defaults 

-- 
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