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pkg/57938: cad/occt OpenCASCADEFoundationClassesTargets.cmake sets -ldl



>Number:         57938
>Category:       pkg
>Synopsis:       cad/occt OpenCASCADEFoundationClassesTargets.cmake sets -ldl
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Feb 15 21:20:00 +0000 2024
>Originator:     Manuel Bouyer
>Release:        NetBSD 10.0_RC2/pkgsrc 2023Q4
>Organization:
>Environment:
System: NetBSD armandeche.soc.lip6.fr 10.0_RC2 NetBSD 10.0_RC2 (GENERIC_CAN) #12: Wed Jan 10 10:47:49 CET 2024 bouyer%armandeche.soc.lip6.fr@localhost:/local/armandeche1/tmp/build/amd64/obj/local/armandeche2/netbsd-10/src/sys/arch/amd64/compile/GENERIC_CAN amd64
Architecture: x86_64
Machine: amd64
>Description:
	cad/occt installs cmake files to be used by other cmake-using package.
	lib/cmake/opencascade/OpenCASCADEFoundationClassesTargets.cmake
	unconditionally sets dl in INTERFACE_LINK_LIBRARIES for the TKernel
	target. This cause softwares including this file to link with the
	TKernel library to try to link with -ldl, which doesn't exists on
	NetBSD.
>How-To-Repeat:
	In a cmakefile:
set(OpenCASCADE_DIR "${CMAKE_PREFIX_PATH}/lib/cmake/occt")
find_package(OpenCASCADE REQUIRED)
target_link_libraries(foo TKernel)

run cmake and see -ldl showing up in link.txt for foo.
>Fix:
	remplacing
INTERFACE_LINK_LIBRARIES "pthread;rt;stdc++;dl"
	with
INTERFACE_LINK_LIBRARIES "pthread;rt;stdc++;${CMAKE_DL_LIBS}"

	works for me but I don't know if it would DTRT on linux.
	An alternative would be to use
if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
	to include dl in the INTERFACE_LINK_LIBRARIES list



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