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@@ -390,9 +390,12 @@ The System part of DEB_HOST_GNU_TYPE
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=head1 DEBIAN/RULES
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The environment variables set by dpkg-architecture are passed to
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-debian/rules as make variables (see make documentation). You can and should
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-use them in the build process as needed. Here are some examples, which also
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-show how you can improve the cross compilation support in your package:
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+debian/rules as make variables (see make documentation). However, you
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+should not rely on them, as this breaks manual invocation of the
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+script. Instead, you should always initialize them using
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+dpkg-architecture with the -q option. Here are some examples, which
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+also show how you can improve the cross compilation support in your
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+package:
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Instead:
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@@ -401,9 +404,10 @@ configure $(ARCH)-linux
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please use the following:
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-B_ARCH=$(DEB_BUILD_GNU_TYPE)
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-H_ARCH=$(DEB_HOST_GNU_TYPE)
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-configure --build=$(B_ARCH) --host=$(H_ARCH)
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+DEB_BUILD_GNU_TYPE := $(shell dpkg-architecture -qDEB_BUILD_GNU_TYPE)
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+DEB_HOST_GNU_TYPE := $(shell dpkg-architecture -qDEB_HOST_GNU_TYPE)
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+
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+configure --build=$(DEB_BUILD_GNU_TYPE) --host=$(DEB_BUILD_GNU_SYSTEM)
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Instead:
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@@ -414,8 +418,9 @@ endif
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please use:
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-ARCH=$(DEB_HOST_ARCH)
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-ifeq ($(ARCH),alpha)
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+DEB_HOST_ARCH := $(shell dpkg-architecture -qDEB_HOST_ARCH)
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+
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+ifeq ($(DEB_HOST_ARCH),alpha)
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...
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endif
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@@ -426,10 +431,11 @@ Debian architectures which don't equal a processor name.
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=head1 BACKWARD COMPATIBILITY
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-When providing a new facility, it is always a good idea to stay compatible with old
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-versions of the programs. Note that dpkg-architecture does not affect old
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-debian/rules files, so the only thing to consider is using old building
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-scripts with new debian/rules files. The following does the job:
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+When providing a new facility, it is always a good idea to stay
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+compatible with old versions of the programs. Note that
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+dpkg-architecture does not affect old debian/rules files, so the only
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+thing to consider is using old versions of dpkg-dev with new
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+debian/rules files. The following does the job:
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DEB_BUILD_ARCH := $(shell dpkg --print-installation-architecture)
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DEB_BUILD_GNU_CPU := $(patsubst hurd-%,%,$(DEB_BUILD_ARCH))
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@@ -440,10 +446,10 @@ else
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endif
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DEB_BUILD_GNU_TYPE=$(DEB_BUILD_GNU_CPU)-$(DEB_BUILD_GNU_SYSTEM)
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-DEB_HOST_ARCH=$(DEB_BUILD_ARCH)
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-DEB_HOST_GNU_CPU=$(DEB_BUILD_GNU_CPU)
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-DEB_HOST_GNU_SYSTEM=$(DEB_BUILD_GNU_SYSTEM)
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-DEB_HOST_GNU_TYPE=$(DEB_BUILD_GNU_TYPE)
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+DEB_HOST_ARCH := $(DEB_BUILD_ARCH)
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+DEB_HOST_GNU_CPU := $(DEB_BUILD_GNU_CPU)
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+DEB_HOST_GNU_SYSTEM := $(DEB_BUILD_GNU_SYSTEM)
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+DEB_HOST_GNU_TYPE := $(DEB_BUILD_GNU_TYPE)
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Put a subset of these lines at the top of your debian/rules file; these
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default values will be overwritten if dpkg-architecture is used.
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@@ -455,20 +461,6 @@ is sufficient (this is indeed the Debian architecture of the build machine,
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but remember that we are only trying to be backward compatible with native
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compilation).
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-You may not want to care about old build packages (for example, if you have
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-sufficient source dependencies declared anyway). But you should at least
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-support the traditional way to build packages by calling `debian/rules
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-build' directly, without setting environment variables. To do this, use the
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-B<-q> option to query suitable default values:
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-
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-DEB_BUILD_ARCH=`dpkg-architecture -qDEB_BUILD_ARCH`
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-DEB_BUILD_GNU=`dpkg-architecture -qDEB_BUILD_GNU`
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-
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-etc. You get the idea. This way, you can ensure that the variables are never
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-undeclared. Note that this breaks backwards compatibility with old build
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-scripts, and you should only do that if source dependencies are implemented
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-and declared accordingly.
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-
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=head1 SEE ALSO
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dpkg-buildpackage
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Wichert Akkerman