tools/cmake/patches/120-curl-fix-libressl-linking.patch

   1 From: Jo-Philipp Wich <jo@mein.io>
   2 Date: Wed, 11 Jan 2017 03:36:04 +0100
   3 Subject: [PATCH] cmcurl: link librt
   4
   5 When cmake is linked against LibreSSL, there might be an indirect
   6 dependency on librt on certain systems if LibreSSL's libcrypto uses
   7 clock_gettime() from librt:
   8
   9     [ 28%] Linking C executable LIBCURL
  10     .../lib/libcrypto.a(getentropy_linux.o): In function `getentropy_fallback':
  11     getentropy_linux.c:(.text+0x16d): undefined reference to `clock_gettime'
  12     getentropy_linux.c:(.text+0x412): undefined reference to `clock_gettime'
  13     collect2: error: ld returned 1 exit status
  14     make[5]: *** [Utilities/cmcurl/LIBCURL] Error 1
  15
  16 Modify the cmcurl CMakeLists.txt to check for clock_gettime() in librt
  17 and unconditionally link the rt library when the symbol is found.
  18
  19 Signed-off-by: Jo-Philipp Wich <jo@mein.io>
  20 ---
  21 --- a/Utilities/cmcurl/CMakeLists.txt
  22 +++ b/Utilities/cmcurl/CMakeLists.txt
  23 @@ -452,6 +452,14 @@ if(CMAKE_USE_OPENSSL)
  24    set(USE_OPENSSL ON)
  25    set(HAVE_LIBCRYPTO ON)
  26    set(HAVE_LIBSSL ON)
  27 +  check_library_exists("rt" clock_gettime "" HAVE_LIBRT)
  28 +  if(HAVE_LIBRT)
  29 +    list(APPEND OPENSSL_LIBRARIES rt)
  30 +  endif()
  31 +  check_library_exists("pthread" pthread_once "" HAVE_PTHREAD)
  32 +  if(HAVE_PTHREAD)
  33 +    list(APPEND OPENSSL_LIBRARIES pthread)
  34 +  endif()
  35    list(APPEND CURL_LIBS ${OPENSSL_LIBRARIES})
  36    include_directories(${OPENSSL_INCLUDE_DIR})
  37    set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})