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Add target existence checks to Unwind find module (#518)

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* Add target existence checks to Unwind find module

The build systems of projects depending on Glog may call the Unwind find
module multiple times. In these cases, the current unwind find module tries
to create a duplicate unwind::unwind target, crashing the build. This
patch adds an existence check before target creation to fix this issue.

Signed-off-by: Michael Darr <mdarr@matician.com>

* Alphabetize contributor list

* Fix inconsistent CMake style

Signed-off-by: Michael Darr <medarr@email.wm.edu>
This commit is contained in:
Michael 2020-01-17 00:17:28 -08:00 committed by Sergiu Deitsch
parent 130a3e10de
commit 195d416e3b
2 changed files with 13 additions and 10 deletions
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1
CONTRIBUTORS
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@ -34,6 +34,7 @@ Ivan Penkov <ivanpe@google.com>
Jacob Trimble <modmaker@google.com>
Jim Ray <jimray@google.com>
Marco Wang <m.aesophor@gmail.com>
Michael Darr <mdarr@matician.com>
Michael Tanner <michael@tannertaxpro.com>
MiniLight <MiniLightAR@Gmail.com>
Peter Collingbourne <pcc@google.com>

22
cmake/FindUnwind.cmake
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@ -62,15 +62,17 @@ find_package_handle_standard_args (Unwind REQUIRED_VARS Unwind_INCLUDE_DIR
Unwind_LIBRARY Unwind_PLATFORM_LIBRARY VERSION_VAR Unwind_VERSION)
if (Unwind_FOUND)
add_library (unwind::unwind INTERFACE IMPORTED)
if (NOT TARGET unwind::unwind)
add_library (unwind::unwind INTERFACE IMPORTED)
set_property (TARGET unwind::unwind PROPERTY
INTERFACE_INCLUDE_DIRECTORIES ${Unwind_INCLUDE_DIR}
)
set_property (TARGET unwind::unwind PROPERTY
INTERFACE_LINK_LIBRARIES ${Unwind_LIBRARY} ${Unwind_PLATFORM_LIBRARY}
)
set_property (TARGET unwind::unwind PROPERTY
IMPORTED_CONFIGURATIONS RELEASE
)
set_property (TARGET unwind::unwind PROPERTY
INTERFACE_INCLUDE_DIRECTORIES ${Unwind_INCLUDE_DIR}
)
set_property (TARGET unwind::unwind PROPERTY
INTERFACE_LINK_LIBRARIES ${Unwind_LIBRARY} ${Unwind_PLATFORM_LIBRARY}
)
set_property (TARGET unwind::unwind PROPERTY
IMPORTED_CONFIGURATIONS RELEASE
)
endif (NOT TARGET unwind::unwind)
endif (Unwind_FOUND)