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# Search for libunwind and components, both includes and libraries
#
# Copyright (C) 2003-2020 The SimGrid Team.
# This is distributed under the LGPL licence but please contact us for
# relicensing if you need. This is merely free software, no matter the licence.
#
#
# Input environment variables:
# LIBUNWIND_HINT: path to libunwind installation (e.g., /usr)
# (only needed for non-standard installs)
#
# You can tune the needed components here.
# TODO: we should take this as a parameter if I knew how to do so.
# SimGrid needs unwind-ptrace on Linux and FreeBSD
if("${CMAKE_SYSTEM}" MATCHES "Linux|FreeBSD")
set(LIBUNWIND_COMPONENTS ${LIBUNWIND_COMPONENTS} unwind-ptrace unwind-generic)
endif()
#
# Output variables:
# HAVE_LIBUNWIND : if all components were found was found
# LIBUNWIND_LIBRARIES: List of all libraries to load (-lunwind -lunwind-x86_64 and such)
#
# Other effects:
# - Calls include_directories() on where libunwind.h lives
# - Calls link_directories() on where the libs live
# Of course also need the core lib
set(LIBUNWIND_COMPONENTS ${LIBUNWIND_COMPONENTS} "unwind")
message(STATUS "Looking for libunwind:")
# Let's assume we have it, and invalidate if parts are missing
SET(HAVE_LIBUNWIND 1)
#
# Search for the header file
#
find_path(PATH_LIBUNWIND_H "libunwind.h"
HINTS
$ENV{LIBUNWIND_HINT}
$ENV{LD_LIBRARY_PATH}
PATH_SUFFIXES include/ GnuWin32/include
PATHS /opt /opt/local /opt/csw /sw /usr)
if(PATH_LIBUNWIND_H)
string(REGEX REPLACE "/libunwind.h" "" PATH_LIBUNWIND_H "${PATH_LIBUNWIND_H}")
message(" Found libunwind.h in ${PATH_LIBUNWIND_H}")
include_directories(${PATH_LIBUNWIND_H})
else()
message(" NOT FOUND libunwind.h")
SET(HAVE_LIBUNWIND 0)
endif()
mark_as_advanced(PATH_LIBUNWIND_H)
#
# Search for the library components
#
foreach(component ${LIBUNWIND_COMPONENTS})
find_library(PATH_LIBUNWIND_LIB_${component}
NAMES ${component}
HINTS
$ENV{LIBUNWIND_HINT}
$ENV{LD_LIBRARY_PATH}
PATH_SUFFIXES lib/ GnuWin32/lib lib/system
PATHS /opt /opt/local /opt/csw /sw /usr /usr/lib/)
if(PATH_LIBUNWIND_LIB_${component})
# message(" ${component} ${PATH_LIBUNWIND_LIB_${component}}")
string(REGEX REPLACE "/lib${component}.*[.]${LIB_EXE}$" "" PATH_LIBUNWIND_LIB_${component} "${PATH_LIBUNWIND_LIB_${component}}")
message(" Found lib${component}.${LIB_EXE} in ${PATH_LIBUNWIND_LIB_${component}}")
link_directories(${PATH_LIBUNWIND_LIB_${component}})
if(${component} STREQUAL "unwind" AND APPLE)
# Apple forbids to link directly against its libunwind implementation
# So let's comply to that stupid restriction and link against the System framework
SET(LIBUNWIND_LIBRARIES "${LIBUNWIND_LIBRARIES} -lSystem")
else()
SET(LIBUNWIND_LIBRARIES "${LIBUNWIND_LIBRARIES} -l${component}")
endif()
else()
message(" Looking for lib${component}.${LIB_EXE} - not found")
SET(HAVE_LIBUNWIND 0)
endif()
mark_as_advanced(PATH_LIBUNWIND_LIB_${component})
endforeach()
unset(component)
unset(LIBUNWIND_COMPONENTS)
#
# Conclude and cleanup
#
if(HAVE_LIBUNWIND)
message(STATUS "Dependencies induced by libunwind: ${LIBUNWIND_LIBRARIES}")
else()
message(STATUS "Some libunwind components are missing")
set(LIBUNWIND_LIBRARIES "")
endif()
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