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... instead of hard-coding /bin/sh.
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Our pkg config rule postprocesses the output of pkgconfig to add
options -rpath where appropriate. This postprocessing, however,
relies on (standard) tools from the environment, in particular
cat(1). Therefore, the environment (in particular PATH) needs to
be set properly for this auxilliary action.
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When a shared library is picked up from the host system via pkg-config
that is located at a non-standard location, binaries linked against
this library by a standard linker either need LD_LIBRARY_PATH set
appropriately, or -rpath set at link time. However, not all custom
installations set -rpath in the link flags in their pkg-config file.
Therefore, in order to get working binaries (and not have to set
custom paths in tests), add a -rpath for every -L option found in
the ldflags provided by pkg-config.
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... instead of creating an ENV from it and propagating this.
The idea is to keep PATH entries separate and only join them
with ":" when we need it. In this way, we can accumulate
PATHs from multiple defaults later, and perform a
deduplication ("nub_left") to shorten the final string
length.
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