cmake: Add comments explaining build_id and fedora/rh detection
Suggested-by: Samuel Bronson <naesten@gmail.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -47,6 +47,10 @@ if (DWARF_INCLUDE_DIR AND LIBDW_INCLUDE_DIR AND DWARF_LIBRARY AND ELF_LIBRARY AN
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set(DWARF_LIBRARIES ${DWARF_LIBRARY} ${ELF_LIBRARY} ${EBL_LIBRARY})
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set(CMAKE_REQUIRED_LIBRARIES ${DWARF_LIBRARIES})
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# check if libdw have the dwfl_module_build_id routine, i.e. if it supports the buildid
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# mechanism to match binaries to detached debug info sections (the -debuginfo packages
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# in distributions such as fedora). We do it against libelf because, IIRC, some distros
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# include libdw linked statically into libelf.
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check_library_exists(elf dwfl_module_build_id "" HAVE_DWFL_MODULE_BUILD_ID)
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else (DWARF_INCLUDE_DIR AND LIBDW_INCLUDE_DIR AND DWARF_LIBRARY AND ELF_LIBRARY AND EBL_LIBRARY)
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set(DWARF_FOUND FALSE)
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@ -63,6 +67,9 @@ if (DWARF_FOUND)
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endif (NOT DWARF_FIND_QUIETLY)
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else (DWARF_FOUND)
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if (DWARF_FIND_REQUIRED)
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# Check if we are in a Red Hat (RHEL) or Fedora system to tell
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# exactly which packages should be installed. Please send
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# patches for other distributions.
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find_path(FEDORA fedora-release /etc)
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find_path(REDHAT redhat-release /etc)
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if (FEDORA OR REDHAT)
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