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cmake: prevent stripping of the rpath on installation.

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This should fix issue #1008.
This commit is contained in:
Guy Harris 2022-09-25 14:35:38 -07:00
parent 77476409d9
commit dcfed11c0b
1 changed files with 40 additions and 0 deletions
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40
CMakeLists.txt
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@ -28,6 +28,46 @@ if(POLICY CMP0074)
cmake_policy(SET CMP0074 NEW)
endif()
#
# OK, this is a pain.
#
# When building on NetBSD, with a libpcap installed from pkgsrc,
# a -Wl,-rpath,/usr/pkg/lib option is added to the options when
# linking tcpdump. This puts /usr/pkg/lib into the run-time path.
#
# However, by default, CMake adds a rule to the install CMake script
# a CMake command (using an undocumented subcommand of file()) that
# strips /usr/pkg/lib *out* of the run-time path; the message in the
# output for the "install" target is
#
# -- Set runtime path of "{target-directory}/tcpdump" to ""
#
# I am not certain what the rationale is for doing this, but a
# *consequence* of this is that, when you run the installed tcpdump,
# it fails to find libpcap.so:
#
# $ {target-directory}/tcpdump -h
# {target-directory}/tcpdump: Shared object "libpcap.so.0" not found
#
# We suppress this by setting CMAKE_INSTALL_RPATH_USE_LINK_PATH to TRUE;
# as the documentation for that variable says:
#
# Add paths to linker search and installed rpath.
#
# CMAKE_INSTALL_RPATH_USE_LINK_PATH is a boolean that if set to True
# will append to the runtime search path (rpath) of installed
# binaries any directories outside the project that are in the linker
# search path or contain linked library files. The directories are
# appended after the value of the INSTALL_RPATH target property.
#
# If, for whatever reason, directories in which we search for external
# libraries, other than the standard system library directories, are
# added to the executable's rpath in the build process, we most
# defintely want them in the installed image's rpath if they are
# necessary in order to find the libraries at run time.
#
set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/Modules)
#