From e323254466575e03d753a33c77667011626c389f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Gregorczyk?= <michalgr@fb.com>
Date: Wed, 25 Mar 2020 13:57:48 -0400
Subject: [PATCH] make -lrt linking optional

On Android there is no standalone rt library and relevant symbols are provided
by libc (bionic).
---
 introspection/CMakeLists.txt | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/introspection/CMakeLists.txt b/introspection/CMakeLists.txt
index c5983b20da49..4328ee117e7c 100644
--- a/introspection/CMakeLists.txt
+++ b/introspection/CMakeLists.txt
@@ -6,8 +6,14 @@ include_directories(${CMAKE_SOURCE_DIR}/src/cc/api)
 include_directories(${CMAKE_SOURCE_DIR}/src/cc/libbpf/include/uapi)
 
 option(INSTALL_INTROSPECTION "Install BPF introspection tools" ON)
+option(BPS_LINK_RT "Pass -lrt to linker when linking bps tool" ON)
+
+set(bps_libs_to_link bpf-static elf z)
+if(BPS_LINK_RT)
+list(APPEND bps_libs_to_link rt)
+endif()
 
 add_executable(bps bps.c)
-target_link_libraries(bps bpf-static elf rt z)
+target_link_libraries(bps ${bps_libs_to_link})
 
 install (TARGETS bps DESTINATION share/bcc/introspection)