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From: Jo-Philipp Wich <jo@mein.io>
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Date: Wed, 11 Jan 2017 03:36:04 +0100
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Subject: [PATCH] cmcurl: link librt
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When cmake is linked against LibreSSL, there might be an indirect
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dependency on librt on certain systems if LibreSSL's libcrypto uses
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clock_gettime() from librt:
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[ 28%] Linking C executable LIBCURL
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.../lib/libcrypto.a(getentropy_linux.o): In function `getentropy_fallback':
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getentropy_linux.c:(.text+0x16d): undefined reference to `clock_gettime'
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getentropy_linux.c:(.text+0x412): undefined reference to `clock_gettime'
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collect2: error: ld returned 1 exit status
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make[5]: *** [Utilities/cmcurl/LIBCURL] Error 1
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Modify the cmcurl CMakeLists.txt to check for clock_gettime() in librt
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and unconditionally link the rt library when the symbol is found.
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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---
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--- a/Utilities/cmcurl/CMakeLists.txt
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+++ b/Utilities/cmcurl/CMakeLists.txt
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@@ -454,6 +454,14 @@ if(CMAKE_USE_OPENSSL)
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set(USE_OPENSSL ON)
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set(HAVE_LIBCRYPTO ON)
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set(HAVE_LIBSSL ON)
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+ check_library_exists("rt" clock_gettime "" HAVE_LIBRT)
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+ if(HAVE_LIBRT)
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+ list(APPEND OPENSSL_LIBRARIES rt)
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+ endif()
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+ check_library_exists("pthread" pthread_once "" HAVE_PTHREAD)
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+ if(HAVE_PTHREAD)
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+ list(APPEND OPENSSL_LIBRARIES pthread)
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+ endif()
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list(APPEND CURL_LIBS ${OPENSSL_LIBRARIES})
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include_directories(${OPENSSL_INCLUDE_DIR})
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