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Makefile: dpkg-architecture -c to set env and exec in one shot
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dpkg-architecture -aarm64 sets DEB_HOST_ARCH=arm64 but does
not propagate the env to the calling shell. The 'eval
$(dpkg-architecture $DPKG_ARCH_ARGS)' pattern tried to bridge
that but failed: the command substitution was parsed by make
before bash ever ran, with $DPKG_ARCH_ARGS still empty at make
parse time.

dpkg-architecture's -c flag runs a command with the proper env
set up: 'dpkg-architecture -aarm64 -c "..."' exports all the
DEB_* vars and then execs the command, all in one process.

The 'CC system type mismatch' warning on stderr is informational
(it complains that the C compiler isn't cross, but we don't
compile C — we only cross-publish .NET binaries). Verified
locally: 'dpkg-architecture -aarm64 -c "echo \$DEB_HOST_ARCH"'
prints 'arm64'.
This commit is contained in:
Paul Schneider 2026-08-17 18:29:39 +01:00
commit 9898edeb30
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Makefile
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@ -54,7 +54,12 @@ deb:
# vars set by dpkg-architecture are visible to dpkg-buildpackage. # vars set by dpkg-architecture are visible to dpkg-buildpackage.
# make runs each recipe line in its own shell, so we use # make runs each recipe line in its own shell, so we use
# backslash continuation to glue everything together. # backslash continuation to glue everything together.
DPKG_ARCH_ARGS=$$(case "$(POSTIT_RUNTIME)" in linux-arm64) echo "-aarm64" ;; linux-x64) echo "-aamd64" ;; *) echo "unsupported POSTIT_RUNTIME=$(POSTIT_RUNTIME)" >&2; exit 1 ;; esac); eval $$(dpkg-architecture $$DPKG_ARCH_ARGS); POSTIT_GIT_URL=$(POSTIT_GIT_URL) POSTIT_GIT_TAG=$(POSTIT_GIT_TAG) POSTIT_RUNTIME=$(POSTIT_RUNTIME) dpkg-buildpackage -us -uc -b # dpkg-architecture -c <cmd> sets up DEB_* vars and runs <cmd>
# in the same shell, so the env is visible to dpkg-buildpackage.
# Use -a (host arch) for cross-builds — it tells dpkg-architecture
# to export DEB_HOST_ARCH=arm64 (and friends) even though we're
# running on amd64. -c avoids the need for a separate eval.
DPKG_ARCH_ARGS=$$(case "$(POSTIT_RUNTIME)" in linux-arm64) echo "-aarm64" ;; linux-x64) echo "-aamd64" ;; *) echo "unsupported POSTIT_RUNTIME=$(POSTIT_RUNTIME)" >&2; exit 1 ;; esac); dpkg-architecture $$DPKG_ARCH_ARGS -c "POSTIT_GIT_URL=$(POSTIT_GIT_URL) POSTIT_GIT_TAG=$(POSTIT_GIT_TAG) POSTIT_RUNTIME=$(POSTIT_RUNTIME) dpkg-buildpackage -us -uc -b"
# dpkg-buildpackage already writes the produced .deb to # dpkg-buildpackage already writes the produced .deb to
# /src/_src/../ = $POSTIT_OUT_DIR (its default — there's no # /src/_src/../ = $POSTIT_OUT_DIR (its default — there's no
# flag to change it). So no 'mv' is needed. The old 'mv' # flag to change it). So no 'mv' is needed. The old 'mv'