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update FindGflags.cmake to work on CentOS 8.x (#1409)

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Summary:
Update FindGflags.cmake to work on recent CentOS and RedHat distributions.

On these distributions the CMake package configuration installed by the
gflags-devel RPM is slightly broken, and sets `gflags_INCLUDE_DIR` to a
directory that does not exist.  This happens because `/lib64` is symlinked to
`/usr/lib64`, and CMake ends up searching `/lib64` before `/usr/lib64` by
default when searching for packages.  Therefore it finds `gflags-config.cmake`
via the `/lib64` symlink.  However, `gflags-config.cmake` computes the include
directory relative to where its config file was found, and this relative path
computation only works when using the actual `/usr/lib64` path where it was
installed.  When found via `/lib64` it returns a bogus `//include` path that
does not exist.

This updates `FindGflags.cmake` to verify if the `gflags_INCLUDE_DIR` path
actually exists, and set it to a sane location instead.

This also updates the code to use the `gflags-shared` target that is exported
by the default gflags package configuration if it was only built as a shared
library.

Pull Request resolved: https://github.com/facebook/folly/pull/1409

Reviewed By: yfeldblum

Differential Revision: D23588288

fbshipit-source-id: b68a717953ae0521f568d7bcfd05ca33cd6dc578
This commit is contained in:
Adam Simpkins 2020-09-09 12:43:11 -07:00 committed by Facebook GitHub Bot
parent d6d36903a8
commit 367dce62df
1 changed files with 26 additions and 2 deletions
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28
build/fbcode_builder/CMake/FindGflags.cmake
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@ -41,6 +41,16 @@ if (gflags_FOUND)
# Re-export the config-specified libs with our local names
set(LIBGFLAGS_LIBRARY ${gflags_LIBRARIES})
set(LIBGFLAGS_INCLUDE_DIR ${gflags_INCLUDE_DIR})
if(NOT EXISTS "${gflags_INCLUDE_DIR}")
# The gflags-devel RPM on recent RedHat-based systems is somewhat broken.
# RedHat symlinks /lib64 to /usr/lib64, and this breaks some of the
# relative path computation performed in gflags-config.cmake. The package
# config file ends up being found via /lib64, but the relative path
# computation it does only works if it was found in /usr/lib64.
# If gflags_INCLUDE_DIR does not actually exist, simply default it to
# /usr/include on these systems.
set(LIBGFLAGS_INCLUDE_DIR "/usr/include")
endif()
set(LIBGFLAGS_FOUND ${gflags_FOUND})
# cmake module compat
set(GFLAGS_FOUND ${gflags_FOUND})
@ -76,6 +86,20 @@ endif()
# Compat with the gflags CONFIG based detection
if (LIBGFLAGS_FOUND AND NOT TARGET gflags)
add_library(gflags UNKNOWN IMPORTED)
set_target_properties(gflags PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${LIBGFLAGS_INCLUDE_DIR}")
set_target_properties(gflags PROPERTIES IMPORTED_LINK_INTERFACE_LANGUAGES "C" IMPORTED_LOCATION "${LIBGFLAGS_LIBRARY}")
if(TARGET gflags-shared)
# If the installed gflags CMake package config defines a gflags-shared
# target but not gflags, just make the gflags target that we define
# depend on the gflags-shared target.
target_link_libraries(gflags INTERFACE gflags-shared)
# Export LIBGFLAGS_LIBRARY as the gflags-shared target in this case.
set(LIBGFLAGS_LIBRARY gflags-shared)
else()
set_target_properties(
gflags
PROPERTIES
IMPORTED_LINK_INTERFACE_LANGUAGES "C"
IMPORTED_LOCATION "${LIBGFLAGS_LIBRARY}"
INTERFACE_INCLUDE_DIRECTORIES "${LIBGFLAGS_INCLUDE_DIR}"
)
endif()
endif()