From 0cf2e8994868cbb94304e7226d123c32ad625e90 Mon Sep 17 00:00:00 2001
From: Kefu Chai <kchai@redhat.com>
Date: Fri, 18 Sep 2020 12:23:13 +0800
Subject: [PATCH] cmake: introduce Boost::MPL interface library

Signed-off-by: Kefu Chai <kchai@redhat.com>
---
 src/CMakeLists.txt               | 10 ++++++++++
 src/crimson/admin/CMakeLists.txt |  3 ++-
 src/crimson/osd/CMakeLists.txt   |  1 +
 src/osd/CMakeLists.txt           |  2 +-
 4 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 38d33bac44ac9..7a86043e5fbe2 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -305,6 +305,16 @@ else()
   include_directories(SYSTEM "${CMAKE_SOURCE_DIR}/src/fmt/include")
 endif()
 
+# in osd/PeeringState.h, the number of elements in PeeringState::Active::reactions
+# is now 21 which exceeds the default value of BOOST_MPL_LIMIT_VECTOR_SIZE, which
+# is 20. so we need to override it. see
+# https://www.boost.org/doc/libs/1_74_0/libs/mpl/doc/refmanual/limit-list-size.html
+# link with this library, if your code includes osd/PeeringState.h (indirectly)
+add_library(Boost::MPL INTERFACE IMPORTED)
+set_target_properties(Boost::MPL PROPERTIES
+  INTERFACE_COMPILE_DEFINITIONS
+    "BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS;BOOST_MPL_LIMIT_LIST_SIZE=30")
+
 if(WITH_SEASTAR)
   find_package(c-ares 1.13.0 QUIET)
   if(NOT c-ares_FOUND)
diff --git a/src/crimson/admin/CMakeLists.txt b/src/crimson/admin/CMakeLists.txt
index e92525e7084a6..aa07717351010 100644
--- a/src/crimson/admin/CMakeLists.txt
+++ b/src/crimson/admin/CMakeLists.txt
@@ -4,4 +4,5 @@ add_library(crimson-admin STATIC
   pg_commands.cc)
 
 target_link_libraries(crimson-admin
-  crimson::cflags)
+  crimson::cflags
+  Boost::MPL)
diff --git a/src/crimson/osd/CMakeLists.txt b/src/crimson/osd/CMakeLists.txt
index 2d0332848364a..898f70c423697 100644
--- a/src/crimson/osd/CMakeLists.txt
+++ b/src/crimson/osd/CMakeLists.txt
@@ -47,6 +47,7 @@ target_link_libraries(crimson-osd
   crimson-os
   crimson
   fmt::fmt
+  Boost::MPL
   dmclock::dmclock)
 set_target_properties(crimson-osd PROPERTIES
   POSITION_INDEPENDENT_CODE ${EXE_LINKER_USE_PIE})
diff --git a/src/osd/CMakeLists.txt b/src/osd/CMakeLists.txt
index 691c1d2280cd7..7cd45171a73a1 100644
--- a/src/osd/CMakeLists.txt
+++ b/src/osd/CMakeLists.txt
@@ -46,7 +46,7 @@ if(HAS_VTA)
 endif()
 add_library(osd STATIC ${osd_srcs})
 target_link_libraries(osd
-  PUBLIC dmclock::dmclock
+  PUBLIC dmclock::dmclock Boost::MPL
   PRIVATE os heap_profiler cpu_profiler ${CMAKE_DL_LIBS})
 if(WITH_LTTNG)
   add_dependencies(osd osd-tp pg-tp)
-- 
2.39.5