From 405b8533f5cad9b8b37fdb43ecbfdf3af9367193 Mon Sep 17 00:00:00 2001
From: "Alexander V. Tikhonov" <avtikhon@tarantool.org>
Date: Fri, 29 Nov 2019 08:48:48 +0300
Subject: [PATCH] build: fix unit tests build with lrt

After the commit 77fa45bd05f8cdd4c0f9bad85185ef5b61528d49
('lua: add fiber.top() listing fiber cpu consumption')
the unit tests builds failed like:

/opt/rh/devtoolset-6/root/usr/libexec/gcc/x86_64-redhat-linux/6.3.1/ld:
  ../../src/lib/core/libcore.a(fiber.c.o): undefined reference to symbol
  'clock_gettime@@GLIBC_2.2.5'
//lib64/librt.so.1: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
test/unit/CMakeFiles/cbus.test.dir/build.make:108: recipe for target
  'test/unit/cbus.test' failed
make[2]: *** [test/unit/cbus.test] Error 1

To fix the issue the 'rt' library was added to test unit cmake file only
for linux and freebsd targets.

Close #4639
---
 CMakeLists.txt              | 6 ++++++
 src/lib/core/CMakeLists.txt | 8 ++++++++
 2 files changed, 14 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7d6c0846eeaf..ca968eb8d807 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -116,6 +116,12 @@ else ()
     set(HAVE_CLOCK_GETTIME ${HAVE_CLOCK_GETTIME_DECL})
 endif ()
 set(CMAKE_REQUIRED_LIBRARIES "")
+# According to `man 2 clockgettime` the glibc wrapper requires
+# -lrt on glibc versions before 2.17. We need to check whether
+# the function is available without -lrt to set this linker option
+# conditionally.
+check_function_exists(clock_gettime HAVE_CLOCK_GETTIME_WITHOUT_RT)
+
 check_symbol_exists(__get_cpuid cpuid.h HAVE_CPUID)
 
 # Checks for libev
diff --git a/src/lib/core/CMakeLists.txt b/src/lib/core/CMakeLists.txt
index e60b5199e15b..8623aa0de9f6 100644
--- a/src/lib/core/CMakeLists.txt
+++ b/src/lib/core/CMakeLists.txt
@@ -46,3 +46,11 @@ target_link_libraries(core salad small uri decNumber ${LIBEV_LIBRARIES}
 if (ENABLE_BACKTRACE AND NOT TARGET_OS_DARWIN)
     target_link_libraries(core gcc_s ${UNWIND_LIBRARIES})
 endif()
+
+# Since fiber.top() introduction, fiber.cc, which is part of core
+# library, depends on clock_gettime() syscall, so we should set
+# -lrt when it is appropriate. See a comment for
+# HAVE_CLOCK_GETTIME_WITHOUT_RT in ${REPO}/CMakeLists.txt.
+if ("${HAVE_CLOCK_GETTIME}" AND NOT "${HAVE_CLOCK_GETTIME_WITHOUT_RT}")
+    target_link_libraries(core rt)
+endif()