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CMake: Restore order-dependent library checks

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Revert commit 2257deb502 (Cmake: Avoid cycle directory dependencies,
2014-08-22) and add a comment explaining the purpose of the original
code.

The check_library_exists_concat macro is intended to be called multiple
times on a sequence of possibly dependent libraries.  Later libraries
may depend on earlier libraries when they are static.  They cannot be
safely linked in reverse order on some platforms.

Signed-off-by: Brad King <brad.king@kitware.com>
This commit is contained in:
Brad King
2014-11-10 19:56:10 +01:00
committed by Daniel Stenberg
parent 1ae06e002d
commit 5f3824a5aa
1 changed files with 6 additions and 3 deletions
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9
CMake/Macros.cmake
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@@ -1,12 +1,15 @@
#File defines convenience macros for available feature testing
# This macro checks if the symbol exists in the library and if it
# does, it appends library to the list.
# does, it prepends library to the list. It is intended to be called
# multiple times with a sequence of possibly dependent libraries in
# order of least-to-most-dependent. Some libraries depend on others
# to link correctly.
macro(CHECK_LIBRARY_EXISTS_CONCAT LIBRARY SYMBOL VARIABLE)
check_library_exists("${CURL_LIBS};${LIBRARY}" ${SYMBOL} "${CMAKE_LIBRARY_PATH}"
check_library_exists("${LIBRARY};${CURL_LIBS}" ${SYMBOL} "${CMAKE_LIBRARY_PATH}"
${VARIABLE})
if(${VARIABLE})
list(APPEND CURL_LIBS ${LIBRARY})
set(CURL_LIBS ${LIBRARY} ${CURL_LIBS})
endif(${VARIABLE})
endmacro(CHECK_LIBRARY_EXISTS_CONCAT)