# COPYRIGHT (c) 2016 Obsidian Research Corporation. See COPYING file
# Run cmake as:
#  mkdir build
#  cmake -GNinja ..
#  ninja
#
# Common options passed to cmake are:
#  -DIN_PLACE=1
#      Configure the build to be run from the build directory, this results in something
#      that is not installable.
#  -DCMAKE_EXPORT_COMPILE_COMMANDS=1
#      Write a compile_commands.json file for clang tooling
#  -DCMAKE_BUILD_TYPE=RelWithDebInfo
#      Change the optimization level, Debug disables optimization,
#      Release is for packagers
#  -DENABLE_VALGRIND=0 (default enabled)
#      Disable valgrind notations, this has a tiny positive performance impact
#  -DENABLE_RESOLVE_NEIGH=0 (default enabled)
#      Do not link to libnl and do not resolve neighbours internally for Ethernet,
#      and do not build iwpmd.
#  -DENABLE_STATIC=1 (default disabled)
#      Produce static libraries along with the usual shared libraries.
#  -DVERBS_PROVIDER_DIR='' (default /usr/lib.../libibverbs)
#      Use the historical search path for providers, in the standard system library.
#  -DNO_COMPAT_SYMS=1 (default disabled)
#      Do not generate backwards compatibility symbols in the shared
#      libraries. This may be necessary if using a dynamic linker that does
#      not support symbol versions, such as uclibc.
#  -DIOCTL_MODE=write (default both)
#      Disable new kABI ioctl() support and support only the legacy write
#      path. May also be 'ioctl' to disable fallback to write.
#  -DIBACM_SERVER_MODE_DEFAULT (default unix)
#      Selects how clients can connect to this server:
#      open) Allow incoming connections from any TCP client (internal or external).
#      loop) Limit incoming connections for server_port to 127.0.0.1.
#      unix) Use unix-domain sockets, hence limits service to the same machine.
#  -DIBACM_ACME_PLUS_KERNEL_ONLY_DEFAULT (default 0)
#      If non-zero, limit incoming requests to kernel or the ib_acme utility
#      (i.e. do not serve librdmacm requests)
#  -DPYTHON_EXECUTABLE
#      Override automatic detection of python to use a certain
#      exectuable. This can be used to force the build to use python2 on a
#      system that has python3 installed. Otherwise the build automatically
#      prefers python3 if available.
#   -DNO_PYVERBS=1 (default, build pyverbs)
#      Invoke cython to build pyverbs. Usually you will run with this option
#      set
#   -DENABLE_IBDIAGS_COMPAT=True (default False)
#      Include obsolete scripts. These scripts are replaced by C programs with
#      a different interface now.
#   -DNO_MAN_PAGES=1 (default 0, build/install the man pages)
#      Disable man pages. Allows rdma-core to be built and installed
#      (without man pages) when neither pandoc/rst2man nor the pandoc-prebuilt
#      directory are available.
#   -DTRACING=LTTNG/USDT/None (default None)
#      Enable LTTng (Linux Trace Toolkit) or USDT (Userspace Statically Defined)
#      trace points for dynamic tracing.

if (${CMAKE_VERSION} VERSION_LESS "3.18.1")
	# Centos 7 support
	cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)
else()
	cmake_minimum_required(VERSION 3.18.1 FATAL_ERROR)
endif()
project(rdma-core C)

# CMake likes to use -rdynamic too much, they fixed it in 3.4.
if(POLICY CMP0065)
  cmake_policy(SET CMP0065 NEW)
else()
  # .. but we really do want to opt out.
  string(REPLACE "-rdynamic" "" CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "${CMAKE_SHARED_LIBRARY_LINK_C_FLAGS}")
endif()

# Make RDMA_CHECK_C_LINKER_FLAG work better
if(POLICY CMP0056)
  cmake_policy(SET CMP0056 NEW)
endif()

set(PACKAGE_NAME "RDMA")

# See Documentation/versioning.md
set(PACKAGE_VERSION "62.0")
# When this is changed the values in these files need changing too:
#   debian/control
#   debian/libibverbs1.symbols
set(IBVERBS_PABI_VERSION "59")
set(IBVERBS_PROVIDER_SUFFIX "-rdmav${IBVERBS_PABI_VERSION}.so")

#-------------------------
# Basic standard paths

# Override the CMAKE_INSTALL_ dirs to be under the build/ directory
if (IN_PLACE)
  set(CMAKE_INSTALL_SYSCONFDIR "${PROJECT_BINARY_DIR}/etc")
  set(CMAKE_INSTALL_BINDIR "${PROJECT_BINARY_DIR}/bin")
  set(CMAKE_INSTALL_SBINDIR "${PROJECT_BINARY_DIR}/bin")
  set(CMAKE_INSTALL_PREFIX "${PROJECT_BINARY_DIR}")
  set(CMAKE_INSTALL_LIBDIR "lib")
  set(CMAKE_INSTALL_INCLUDEDIR "include")
endif()

include(GNUInstallDirs)
# C include root
set(BUILD_INCLUDE ${PROJECT_BINARY_DIR}/include)
# Executables
set(BUILD_BIN ${PROJECT_BINARY_DIR}/bin)
# Libraries
set(BUILD_LIB ${PROJECT_BINARY_DIR}/lib)
# Static library pre-processing
set(BUILD_STATIC_LIB ${PROJECT_BINARY_DIR}/lib/statics)
# Used for IN_PLACE configuration
set(BUILD_ETC ${PROJECT_BINARY_DIR}/etc)
set(BUILD_PYTHON ${PROJECT_BINARY_DIR}/python)

set(IBDIAG_CONFIG_PATH "${CMAKE_INSTALL_FULL_SYSCONFDIR}/infiniband-diags")
set(IBDIAG_NODENAME_MAP_PATH "${CMAKE_INSTALL_FULL_SYSCONFDIR}/rdma/ib-node-name-map")

set(CMAKE_INSTALL_INITDDIR "${CMAKE_INSTALL_SYSCONFDIR}/init.d"
  CACHE PATH "Location for init.d files")
set(CMAKE_INSTALL_MODPROBEDIR "${CMAKE_INSTALL_SYSCONFDIR}/modprobe.d/"
  CACHE PATH "Location for modprobe.d files")
set(CMAKE_INSTALL_SYSTEMD_SERVICEDIR "${CMAKE_INSTALL_PREFIX}/lib/systemd/system"
  CACHE PATH "Location for systemd service files")
set(CMAKE_INSTALL_SYSTEMD_BINDIR "/lib/systemd"
  CACHE PATH "Location for systemd extra binaries")

set(ACM_PROVIDER_DIR "${CMAKE_INSTALL_FULL_LIBDIR}/ibacm"
  CACHE PATH "Location for ibacm provider plugin shared library files.")
# Location to find the provider plugin shared library files
set(VERBS_PROVIDER_DIR "${CMAKE_INSTALL_FULL_LIBDIR}/libibverbs"
  CACHE PATH "Location for provider plugin shared library files. If set to empty the system search path is used.")

# Allow the 'run' dir to be configurable, this historically has been /var/run, but
# some systems now use /run/
set(CMAKE_INSTALL_RUNDIR "var/run"
  CACHE PATH "Location for runtime information, typically /var/run, or /run")
if(NOT IS_ABSOLUTE ${CMAKE_INSTALL_RUNDIR})
  set(CMAKE_INSTALL_FULL_RUNDIR "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_RUNDIR}")
else()
  set(CMAKE_INSTALL_FULL_RUNDIR "${CMAKE_INSTALL_RUNDIR}")
endif()

# Allow the udev rules.d dir to be configurable, this has historically been
# /lib/udev/rules.d/, but some systems now prefix /usr/
set(CMAKE_INSTALL_UDEV_RULESDIR "lib/udev/rules.d"
  CACHE PATH "Location for system udev rules, typically /lib/udev/rules.d or /usr/lib/udev/rules.d")
if(NOT IS_ABSOLUTE ${CMAKE_INSTALL_UDEV_RULESDIR})
  set(CMAKE_INSTALL_FULL_UDEV_RULESDIR "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_UDEV_RULESDIR}")
else()
  set(CMAKE_INSTALL_FULL_UDEV_RULESDIR "${CMAKE_INSTALL_UDEV_RULESDIR}")
endif()

# Allow the perl library dir to be configurable
set(CMAKE_INSTALL_PERLDIR "share/perl5"
  CACHE PATH "Location for system perl library, typically /usr/share/perl5")
if(NOT IS_ABSOLUTE ${CMAKE_INSTALL_PERLDIR})
  set(CMAKE_INSTALL_FULL_PERLDIR "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_PERLDIR}")
else()
  set(CMAKE_INSTALL_FULL_PERLDIR "${CMAKE_INSTALL_PERLDIR}")
endif()

# Location to place provider .driver files
if (IN_PLACE)
  set(CONFIG_DIR "${BUILD_ETC}/libibverbs.d")
  set(VERBS_PROVIDER_DIR "${BUILD_LIB}")
  set(ACM_PROVIDER_DIR "${BUILD_LIB}/ibacm")
else()
  set(CONFIG_DIR "${CMAKE_INSTALL_FULL_SYSCONFDIR}/libibverbs.d")
endif()

set(DISTRO_FLAVOUR "None" CACHE
  STRING "Flavour of distribution to install for. This primarily impacts the init.d scripts installed.")

set(TRACING "None" CACHE
  STRING "Enable LTTNG (Linux Trace Toolkit) or USDT (Userspace Statically Defined Tracing).")

#-------------------------
# Load CMake components
set(BUILDLIB "${PROJECT_SOURCE_DIR}/buildlib")
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${BUILDLIB}")

include(CMakeParseArguments)
include(CheckCCompilerFlag)
include(CheckCSourceCompiles)
include(CheckIncludeFile)
include(CheckTypeSize)
include(RDMA_EnableCStd)
include(RDMA_Sparse)
include(RDMA_BuildType)
include(RDMA_DoFixup)
include(publish_headers)
include(rdma_functions)
include(pyverbs_functions)

check_c_compiler_flag("-Wcast-align=strict" HAVE_WCAST_ALIGN_STRICT)

if (NO_MAN_PAGES)
  # define empty stub functions to omit man page processing
  function(rdma_man_pages)
  endfunction()
  function(rdma_alias_man_pages)
  endfunction()
else()
  include(rdma_man)
endif()

if (NOT DEFINED ENABLE_STATIC)
  set(ENABLE_STATIC "OFF" CACHE BOOL "Produce static linking libraries as well as shared libraries.")
endif()

#-------------------------
# Setup the basic C compiler
RDMA_BuildType()
include_directories(${BUILD_INCLUDE})

# Working means that the compiler doesn't spew output that confuses cmake's
# capabilitiy tests. ie cmake will test and succeed a simple program
RDMA_Check_C_Compiles(HAVE_WORKING_WERROR "int main(int argc,const char *argv[]) { return 0; }" "")
if (NOT HAVE_WORKING_WERROR)
  message(FATAL_ERROR "-Werror doesn't work (compiler always creates warnings?). Werror is required for CMake.")
endif()

# Use Python modules based on CMake version for backward compatibility
if (${CMAKE_VERSION} VERSION_LESS "3.12")
        FIND_PACKAGE(PythonInterp REQUIRED)
        FIND_PACKAGE(PythonLibs ${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR} EXACT)
elseif (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.12")
        set(Python_EXECUTABLE ${PYTHON_EXECUTABLE})
        FIND_PACKAGE(Python 3 REQUIRED COMPONENTS Interpreter OPTIONAL_COMPONENTS Development)
        set(PYTHON_EXECUTABLE ${Python_EXECUTABLE})
        if(Python_Development_FOUND)
            set(PYTHONLIBS_FOUND ${Python_Development_FOUND})
            set(PYTHON_LIBRARIES ${Python_LIBRARIES})
            set(PYTHON_INCLUDE_DIRS ${Python_INCLUDE_DIRS})
        endif()
endif()

set(CYTHON_EXECUTABLE "")
if(NOT NO_PYVERBS AND PYTHONLIBS_FOUND)
    execute_process(COMMAND "${PYTHON_EXECUTABLE}" -c
        "import sysconfig; print(sysconfig.get_path(\"platlib\"))"
        OUTPUT_VARIABLE py_path)
    string(STRIP ${py_path} py_path)
    set(CMAKE_INSTALL_PYTHON_ARCH_LIB "${py_path}"
        CACHE PATH "Location for architecture specific python libraries")

    # See PEP3149
    execute_process(COMMAND "${PYTHON_EXECUTABLE}" -c
        "import sysconfig; x = sysconfig.get_config_var(\"EXT_SUFFIX\"); print(x if x else '.so')"
        OUTPUT_VARIABLE py_path)
    string(STRIP ${py_path} CMAKE_PYTHON_SO_SUFFIX)

    FIND_PACKAGE(cython)
elseif(NOT NO_PYVERBS AND NOT PYTHONLIBS_FOUND)
    message(WARNING "pyverbs build requested but python development files not found")
endif()

find_program(SYSTEMCTL_BIN systemctl HINTS "/usr/bin" "/bin")
if (NOT SYSTEMCTL_BIN)
  set (SYSTEMCTL_BIN "/bin/systemctl")
endif()

RDMA_CheckSparse()

# Require GNU99 mode
RDMA_EnableCStd()

# Extra warnings. Turn on -Wextra to keep aware of interesting developments from gcc,
# but turn off some that are not terribly useful for this source.
# FIXME: I wonder how many of the signed compares are bugs?
RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WARNINGS
  "-Wall -Wextra -Wno-sign-compare -Wno-unused-parameter")
RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WMISSING_PROTOTYPES "-Wmissing-prototypes")
RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WMISSING_DECLARATIONS "-Wmissing-declarations")
RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WWRITE_STRINGS "-Wwrite-strings")
RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WFORMAT_2 "-Wformat=2")
RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WCAST_FUNCTION "-Wcast-function-type")
RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WFORMAT_NONLITERAL "-Wformat-nonliteral")
RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WDATE_TIME "-Wdate-time")
RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WNESTED_EXTERNS "-Wnested-externs")

# At some point after 4.4 gcc fixed shadow to ignore function vs variable
# conflicts
RDMA_Check_C_Compiles(HAVE_C_WORKING_SHADOW "
 #include <unistd.h>
 int main(int argc,const char *argv[]) { int access = 1; return access; }"
  "-Wshadow")
if (HAVE_C_WORKING_SHADOW)
  RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WORKING_SHADOW "-Wshadow")
endif()

# At some point around 5.4 gcc fixed missing-field-initializers to ignore this
# common idiom we use extensively. Since this is a useful warning for
# developers try and leave it on if the compiler supports it.
RDMA_Check_C_Compiles(HAVE_C_WORKING_MISSING_FIELD_INITIALIZERS "
 struct foo { int a; int b; };
 int main(int argc,const char *argv[]) { struct foo tmp = {}; return tmp.a; }"
)
if (NOT HAVE_C_WORKING_MISSING_FIELD_INITIALIZERS)
  RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WNO_MISSING_FIELD_INITIALIZERS "-Wno-missing-field-initializers")
endif()

# clang doesn't support variable size GCC extension
RDMA_Check_C_Compiles(HAVE_C_VARIABLE_SIZE "
 struct c { int a; int b[]; };
 struct foo { struct c c; int b; };
 int main(int argc,const char *argv[]) { return 0; }"
)
if (NOT HAVE_C_VARIABLE_SIZE)
	RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WNO_VARIABLE_SIZE "-Wno-gnu-variable-sized-type-not-at-end")
endif()

# Check that the compiler supports -fno-strict-aliasing.
# The use of this flag in the source is discouraged
set(NO_STRICT_ALIASING_FLAGS "")
RDMA_AddOptCFlag(NO_STRICT_ALIASING_FLAGS HAVE_NO_STRICT_ALIASING
  "-fno-strict-aliasing")

# pyverbs has a problem with var-tracking warnings, turn it off if we can.
set(NO_VAR_TRACKING_FLAGS "")
RDMA_AddOptCFlag(NO_VAR_TRACKING_FLAGS HAVE_NO_VAR_TRACKING_ASSIGNMENTS
  "-fno-var-tracking-assignments")

RDMA_Check_C_Compiles(HAVE_FUNC_ATTRIBUTE_IFUNC "
 #include <unistd.h>

 void entry(void);

 static void do_entry(void) {}
 void entry(void) __attribute__((ifunc(\"resolve_entry\")));
 typedef void (*fn_t)(void);
 static fn_t resolve_entry(void) {return &do_entry;}

 int main(int argc,const char *argv[]) { entry(); }"
)

RDMA_Check_C_Compiles(HAVE_FUNC_ATTRIBUTE_SYMVER "
 #include <unistd.h>

 void _sym(void);
 __attribute__((__symver__(\"sym@TEST_1.1\"))) void _sym(void) {}

 int main(int argc,const char *argv[]) { _sym(); }"
)

# The code does not do the racy fcntl if the various CLOEXEC's are not
# supported so it really doesn't work right if this isn't available. Thus hard
# require it.
CHECK_C_SOURCE_COMPILES("
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <fcntl.h>
 int main(int argc,const char *argv[]) {
    open(\".\",O_RDONLY | O_CLOEXEC);
    socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
    return 0;
 }" HAS_CLOEXEC)

if (NOT HAS_CLOEXEC)
# At least uclibc wrongly hides this POSIX constant behind _GNU_SOURCE
CHECK_C_SOURCE_COMPILES("
 #define _GNU_SOURCE
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <fcntl.h>
 int main(int argc,const char *argv[]) {
    open(\".\",O_RDONLY | O_CLOEXEC);
    socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
    return 0;
 }" HAS_CLOEXEC_GNU_SOURCE)
  if (HAS_CLOEXEC_GNU_SOURCE)
    set(HAS_CLOEXEC 1)
    add_definitions("-D_GNU_SOURCE=")
  endif()
endif()

if (NOT HAS_CLOEXEC)
  message(FATAL_ERROR "O_CLOEXEC/SOCK_CLOEXEC/fopen(..,\"e\") support is required but not found")
endif()

# always_inline is supported
RDMA_Check_C_Compiles(HAVE_FUNC_ATTRIBUTE_ALWAYS_INLINE "
 int foo(void);
 inline __attribute__((always_inline)) int foo(void) {return 0;}
 int main(int argc,const char *argv[]) { return foo(); }"
)

# Linux __u64 is an unsigned long long
RDMA_Check_C_Compiles(HAVE_LONG_LONG_U64 "
#include <linux/types.h>
 int main(int argc,const char *argv[]) { __u64 tmp = 0; unsigned long long *tmp2 = &tmp; return *tmp2; }"
)

if (NOT HAVE_LONG_LONG_U64)
  # Modern Linux has switched to use ull in all cases, but to avoid disturbing
  # userspace some platforms continued to use unsigned long by default. This
  # define will cause kernel headers to consistently use unsigned long long
  add_definitions("-D__SANE_USERSPACE_TYPES__")
endif()

# Check __SOCKADDR_ARG exist and is union
set(SAFE_CMAKE_REQUIRED_INCLUDES "${CMAKE_REQUIRED_INCLUDES}")
set(CMAKE_REQUIRED_INCLUDES "${BUILD_INCLUDE}")
RDMA_Check_C_Compiles(HAVE_SOCKADDR_ARG_AS_UNION "
#define _GNU_SOURCE
#include <sys/socket.h>
 int main(int argc,const char *argv[]) {struct sockaddr addr;__SOCKADDR_ARG sa; sa.__sockaddr__ = (struct sockaddr *)&addr; (void)addr; (void)sa; return 0;}"
)
set(CMAKE_REQUIRED_INCLUDES "${SAFE_CMAKE_REQUIRED_INCLUDES}")

# glibc and kernel uapi headers can co-exist
CHECK_C_SOURCE_COMPILES("
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <linux/in.h>
 #include <linux/in6.h>
 int main(int argc,const char *argv[]) { return 0; }"
  HAVE_GLIBC_UAPI_COMPAT)
RDMA_DoFixup("${HAVE_GLIBC_UAPI_COMPAT}" "linux/in.h")
RDMA_DoFixup("${HAVE_GLIBC_UAPI_COMPAT}" "linux/in6.h")

# The compiler has working -fstrict-aliasing support, old gcc's do not. If
# broken then globally disable strict aliasing.
RDMA_Check_Aliasing(HAVE_WORKING_STRICT_ALIASING)
if (NOT HAVE_WORKING_STRICT_ALIASING)
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${NO_STRICT_ALIASING_FLAGS}")
endif()

# Check if off_t is 64 bits, eg large file support is enabled
CHECK_C_SOURCE_COMPILES("
#include <sys/types.h>
 #define BUILD_ASSERT_OR_ZERO(cond) (sizeof(char [1 - 2*!(cond)]) - 1)
 int main(int argc,const char *argv[]) { return BUILD_ASSERT_OR_ZERO(sizeof(off_t) >= 8); }"
  HAVE_LARGE_FILES)

if (NOT HAVE_LARGE_FILES)
  CHECK_C_SOURCE_COMPILES("
#define _FILE_OFFSET_BITS 64
#include <sys/types.h>
 #define BUILD_ASSERT_OR_ZERO(cond) (sizeof(char [1 - 2*!(cond)]) - 1)
 int main(int argc,const char *argv[]) { return BUILD_ASSERT_OR_ZERO(sizeof(off_t) >= 8); }"
    HAVE_LARGE_FILES2)
  if (NOT HAVE_LARGE_FILES2)
    message(FATAL_ERROR "Could not enable large file support")
  endif()
  add_definitions("-D_FILE_OFFSET_BITS=64")
endif()

# Provide a shim if C11 stdatomic.h is not supported.
if (NOT HAVE_SPARSE)
  CHECK_INCLUDE_FILE("stdatomic.h" HAVE_STDATOMIC)
  RDMA_DoFixup("${HAVE_STDATOMIC}" "stdatomic.h")
endif()

RDMA_Check_SSE(HAVE_TARGET_SSE)

# Enable development support features
# Prune unneeded shared libraries during linking
RDMA_AddOptLDFlag(CMAKE_EXE_LINKER_FLAGS SUPPORTS_AS_NEEDED "-Wl,--as-needed")
RDMA_AddOptLDFlag(CMAKE_SHARED_LINKER_FLAGS SUPPORTS_AS_NEEDED "-Wl,--as-needed")
RDMA_AddOptLDFlag(CMAKE_MODULE_LINKER_FLAGS SUPPORTS_AS_NEEDED "-Wl,--as-needed")

# Ensure all shared ELFs have fully described linking
RDMA_AddOptLDFlag(CMAKE_EXE_LINKER_FLAGS SUPPORTS_NO_UNDEFINED "-Wl,--no-undefined")
RDMA_AddOptLDFlag(CMAKE_SHARED_LINKER_FLAGS SUPPORTS_NO_UNDEFINED "-Wl,--no-undefined")

# Enable gold linker - gold has different linking checks
#RDMA_AddOptLDFlag(CMAKE_EXE_LINKER_FLAGS SUPPORTS_NO_UNDEFINED "-fuse-ld=gold")
#RDMA_AddOptLDFlag(CMAKE_SHARED_LINKER_FLAGS SUPPORTS_NO_UNDEFINED "-fuse-ld=gold")
#RDMA_AddOptLDFlag(CMAKE_MODULE_LINKER_FLAGS SUPPORTS_NO_UNDEFINED "-fuse-ld=gold")

# Verify that GNU --version-script and asm(".symver") works
find_package(LDSymVer REQUIRED)
if (NO_COMPAT_SYMS)
  set(HAVE_LIMITED_SYMBOL_VERSIONS 1)
else()
  set(HAVE_FULL_SYMBOL_VERSIONS 1)
endif()

set(NO_MAN_PAGES "OFF" CACHE BOOL "Disable build/install of man pages")
if (NOT NO_MAN_PAGES)
  # Look for pandoc and rst2man for making manual pages
  FIND_PACKAGE(pandoc)
  FIND_PACKAGE(rst2man)
endif ()

#-------------------------
# Find libraries
# pthread
FIND_PACKAGE (Threads REQUIRED)

FIND_PACKAGE(PkgConfig REQUIRED)

# libnl
if (NOT DEFINED ENABLE_RESOLVE_NEIGH)
  set(ENABLE_RESOLVE_NEIGH "ON" CACHE BOOL "Enable internal resolution of neighbours for Etherent")
endif()
if (ENABLE_RESOLVE_NEIGH)
  # FIXME use of pkgconfig is discouraged
  pkg_check_modules(NL libnl-3.0 libnl-route-3.0 REQUIRED)
  include_directories(${NL_INCLUDE_DIRS})
  link_directories(${NL_LIBRARY_DIRS})
  set(NL_KIND 3)
else()
  set(NL_KIND 0)
  set(NL_LIBRARIES "")
  RDMA_DoFixup(0 "netlink/attr.h")
  RDMA_DoFixup(0 "netlink/msg.h")
  RDMA_DoFixup(0 "netlink/netlink.h")
  RDMA_DoFixup(0 "netlink/object-api.h")
  RDMA_DoFixup(0 "netlink/route/link.h")
  RDMA_DoFixup(0 "netlink/route/link/vlan.h")
  RDMA_DoFixup(0 "netlink/route/neighbour.h")
  RDMA_DoFixup(0 "netlink/route/route.h")
  RDMA_DoFixup(0 "netlink/route/rtnl.h")
endif()

# Older stuff blows up if these headers are included together
if (NOT NL_KIND EQUAL 0)
  set(SAFE_CMAKE_REQUIRED_INCLUDES "${CMAKE_REQUIRED_INCLUDES}")
  set(CMAKE_REQUIRED_INCLUDES "${NL_INCLUDE_DIRS}")
  CHECK_C_SOURCE_COMPILES("
#include <netlink/route/link.h>
#include <net/if.h>
 int main(int argc,const char *argv[]) {return 0;}"
    HAVE_WORKING_IF_H)
  set(CMAKE_REQUIRED_INCLUDES "${SAFE_CMAKE_REQUIRED_INCLUDES}")
endif()

# udev
find_package(UDev)
include_directories(${UDEV_INCLUDE_DIRS})

# Statically determine sizeof(long), this is largely unnecessary, no new code
# should rely on this.
check_type_size("long" SIZEOF_LONG BUILTIN_TYPES_ONLY LANGUAGE C)

# Determine if this arch supports cache coherent DMA. This isn't really an
# arch specific property, but for our purposes arches that do not support it
# also do not define wmb/etc which breaks our compile.
# As a special case s390x always has coherent DMA but needs linking for its wmb
CHECK_C_SOURCE_COMPILES("
#if !defined(__s390x__)
#include \"${CMAKE_CURRENT_SOURCE_DIR}/util/udma_barrier.h\"
#endif
 int main(int argc,const char *argv[]) {return 0;}"
  HAVE_COHERENT_DMA)

find_package(Systemd)
include_directories(${SYSTEMD_INCLUDE_DIRS})
RDMA_DoFixup("${SYSTEMD_FOUND}" "systemd/sd-daemon.h")

# drm headers

# Check if the headers have been installed by kernel-headers
find_path(DRM_INCLUDE_DIRS "drm.h" PATH_SUFFIXES "drm" "libdrm")

# Alternatively the headers could have been installed by libdrm
if (NOT DRM_INCLUDE_DIRS)
  pkg_check_modules(DRM libdrm)
endif()

if (DRM_INCLUDE_DIRS)
  if (EXISTS "${DRM_INCLUDE_DIRS}/i915_drm.h" AND EXISTS "${DRM_INCLUDE_DIRS}/amdgpu_drm.h")
    include_directories(${DRM_INCLUDE_DIRS})
  else()
    unset(DRM_INCLUDE_DIRS CACHE)
  endif()
endif()

# Dynamic Tracing support
if (TRACING STREQUAL "LTTNG")
  include(FindLTTngUST REQUIRED)
  add_definitions(-DLTTNG_ENABLED)
elseif (TRACING STREQUAL "USDT")
  add_definitions(-DUSDT_ENABLED)
elseif (NOT TRACING STREQUAL "None")
  message(FATAL_ERROR "-DTRACING=${TRACING} is not a valid choice")
endif()

#-------------------------
# Apply fixups

# We prefer to build with valgrind memcheck.h present, but if not, or the user
# requested valgrind disabled, then replace it with our dummy stub.
if (NOT DEFINED ENABLE_VALGRIND)
  set(ENABLE_VALGRIND "ON" CACHE BOOL "Enable use of valgrind annotations")
endif()
if (ENABLE_VALGRIND)
  CHECK_INCLUDE_FILE("valgrind/memcheck.h" HAVE_VALGRIND_MEMCHECK)
  CHECK_INCLUDE_FILE("valgrind/drd.h" HAVE_VALGRIND_DRD)
else()
  set(HAVE_VALGRIND_MEMCHECK 0)
  set(HAVE_VALGRIND_DRD 0)
endif()
RDMA_DoFixup("${HAVE_VALGRIND_MEMCHECK}" "valgrind/memcheck.h")
RDMA_DoFixup("${HAVE_VALGRIND_DRD}" "valgrind/drd.h")

# Older glibc does not include librt
CHECK_C_SOURCE_COMPILES("
#include <time.h>
int main(int argc,const char *argv[]) {
   clock_gettime(CLOCK_MONOTONIC,0);
   clock_nanosleep(CLOCK_MONOTONIC,0,0,0);
   return 0;
};" LIBC_HAS_LIBRT)
if (NOT LIBC_HAS_LIBRT)
  set(RT_LIBRARIES "rt")
endif()

# Check for static_assert
CHECK_C_SOURCE_COMPILES("
#include <assert.h>
static_assert(1, \"failed\");
int main(int argc,const char *argv[]) {
   static_assert(1, \"failed\");
   return 0;
};" HAVE_STATIC_ASSERT)
RDMA_DoFixup("${HAVE_STATIC_ASSERT}" "assert.h")

#-------------------------
# Final warning flags

# Old version of cmake used 'main(){..}' as their test program which breaks with -Werror.
# So set this flag last.
RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WSTRICT_PROTOTYPES "-Wstrict-prototypes")
RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WOLD_STYLE_DEFINITION "-Wold-style-definition")

if (ENABLE_WERROR)
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror")
  message(STATUS "Enabled -Werror")
endif()

# Old versions of libnl have a duplicated rtnl_route_put, disbale the warning on those
# systems
if (NOT NL_KIND EQUAL 0)
  set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
  set(CMAKE_REQUIRED_INCLUDES "${NL_INCLUDE_DIRS}")
  RDMA_Check_C_Compiles(HAVE_C_WREDUNDANT_DECLS "
 #include <netlink/route/route.h>
 int main(int argc,const char *argv[]) { return 0; }"
  "-Wredundant-decls")
  set(CMAKE_REQUIRED_INCLUDES "${SAFE_CMAKE_REQUIRED_INCLUDES}")
endif()
RDMA_AddOptCFlag(CMAKE_C_FLAGS HAVE_C_WREDUNDANT_DECLS "-Wredundant-decls")

# Support of getrandom() was added to glibc in version 2.25
CHECK_C_SOURCE_COMPILES("
 #include <sys/random.h>
 int main(int argc,const char *argv[]) {char buf[64]; return getrandom(buf, 64, GRND_NONBLOCK);}"
 HAVE_GLIBC_GETRANDOM)
RDMA_DoFixup("${HAVE_GLIBC_GETRANDOM}" "sys/random.h")

# glibc 2.33 and newer stopped to properly declare __fxstat in sys/stat.h
RDMA_Check_C_Compiles(HAVE_GLIBC_FXSTAT "
 #include <sys/stat.h>
 int main(int argc,const char *argv[]) {
 struct stat stat = {};  __fxstat(0, 0, &stat);  return 0;}")
RDMA_DoFixup("${HAVE_GLIBC_FXSTAT}" "sys/stat.h")


# glibc before 2.35 does not necesarily define the HWCAP_S390_PCI_MIO hardware
# capability bit constant. Check for it and if necessary shim it in such that
# kernel support for PCI MIO instructions can always be checked.
RDMA_Check_C_Compiles(HAVE_GLIBC_HWCAP_S390_PCI_MIO "
 #if defined(__s390x__)
 #include <sys/auxv.h>
 int main(int argc, const char *argv[]) {
 return !!(getauxval(AT_HWCAP) & HWCAP_S390_PCI_MIO);}
 #else
 int main(int argc, const char *argv[]) {return 0;}
 #endif
 ")
RDMA_DoFixup("${HAVE_GLIBC_HWCAP_S390_PCI_MIO}" "sys/auxv.h")

#-------------------------
# Build Prep
# Write out a git ignore file to the build directory if it isn't the source
# directory. For developer convenience
if (NOT ${CMAKE_CURRENT_BINARY_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
  file(WRITE ${PROJECT_BINARY_DIR}/.gitignore "*")
endif()

if ("${IOCTL_MODE}" STREQUAL "both")
  set(IOCTL_MODE_NUM 3)
elseif ("${IOCTL_MODE}" STREQUAL "write")
  set(IOCTL_MODE_NUM 2)
elseif ("${IOCTL_MODE}" STREQUAL "ioctl")
  set(IOCTL_MODE_NUM 1)
elseif ("${IOCTL_MODE}" STREQUAL "")
  set(IOCTL_MODE_NUM 3)
else()
  message(FATAL_ERROR "-DIOCTL_MODE=${IOCTL_MODE} is not a valid choice")
endif()

# Configuration defaults

if ("${IBACM_SERVER_MODE_DEFAULT}" STREQUAL "open")
  set(IBACM_SERVER_MODE_DEFAULT "IBACM_SERVER_MODE_OPEN")
elseif ("${IBACM_SERVER_MODE_DEFAULT}" STREQUAL "loop")
  set(IBACM_SERVER_MODE_DEFAULT "IBACM_SERVER_MODE_LOOP")
else()
  set(IBACM_SERVER_MODE_DEFAULT "IBACM_SERVER_MODE_UNIX")
endif()

if (IBACM_ACME_PLUS_KERNEL_ONLY_DEFAULT)
  set(IBACM_ACME_PLUS_KERNEL_ONLY_DEFAULT 1)
else()
  set(IBACM_ACME_PLUS_KERNEL_ONLY_DEFAULT 0)
endif()

configure_file("${BUILDLIB}/config.h.in" "${BUILD_INCLUDE}/config.h" ESCAPE_QUOTES @ONLY)

#-------------------------
# Sub-directories
add_subdirectory(ccan)
add_subdirectory(util)
add_subdirectory(util/tests)
add_subdirectory(Documentation)
add_subdirectory(kernel-boot)
add_subdirectory(kernel-headers)
# Libraries
add_subdirectory(libibumad)
add_subdirectory(libibumad/man)
add_subdirectory(libibverbs)
add_subdirectory(libibverbs/man)
add_subdirectory(librdmacm)
add_subdirectory(librdmacm/man)

# Providers
if (HAVE_COHERENT_DMA)
add_subdirectory(providers/bnxt_re)
add_subdirectory(providers/cxgb4) # NO SPARSE
add_subdirectory(providers/efa)
add_subdirectory(providers/efa/man)
add_subdirectory(providers/erdma)
add_subdirectory(providers/hns)
add_subdirectory(providers/hns/man)
add_subdirectory(providers/ionic)
add_subdirectory(providers/irdma)
add_subdirectory(providers/mana)
add_subdirectory(providers/mana/man)
add_subdirectory(providers/mlx4)
add_subdirectory(providers/mlx4/man)
add_subdirectory(providers/mlx5)
add_subdirectory(providers/mlx5/man)
add_subdirectory(providers/mthca)
add_subdirectory(providers/ocrdma)
add_subdirectory(providers/qedr)
add_subdirectory(providers/vmw_pvrdma)
endif()

add_subdirectory(providers/hfi1verbs)
add_subdirectory(providers/ipathverbs)
add_subdirectory(providers/rxe)
add_subdirectory(providers/rxe/man)
add_subdirectory(providers/siw)

add_subdirectory(libibmad)
add_subdirectory(libibnetdisc)
add_subdirectory(libibnetdisc/man)
add_subdirectory(infiniband-diags)
add_subdirectory(infiniband-diags/scripts)
add_subdirectory(infiniband-diags/man)

if (CYTHON_EXECUTABLE)
  add_subdirectory(pyverbs)
  add_subdirectory(tests)
endif()

# Binaries
if (NOT NL_KIND EQUAL 0)
  add_subdirectory(ibacm) # NO SPARSE
endif()

if (NOT NL_KIND EQUAL 0)
  add_subdirectory(iwpmd)
endif()
add_subdirectory(libibumad/tests)
add_subdirectory(libibverbs/examples)
add_subdirectory(librdmacm/examples)
if (UDEV_FOUND)
  add_subdirectory(rdma-ndd)
endif()
add_subdirectory(srp_daemon)

ibverbs_finalize()
rdma_finalize_libs()

#-------------------------
# Display a summary
# Only report things that are non-ideal.
message(STATUS "Missing Optional Items:")
if (NOT HAVE_FUNC_ATTRIBUTE_ALWAYS_INLINE)
  message(STATUS " Compiler attribute always_inline NOT supported")
endif()
if (NOT HAVE_FUNC_ATTRIBUTE_IFUNC)
  message(STATUS " Compiler attribute ifunc NOT supported")
endif()
if (NOT HAVE_FUNC_ATTRIBUTE_SYMVER)
  message(STATUS " Compiler attribute symver NOT supported, can not use LTO")
endif()
if (NOT HAVE_COHERENT_DMA)
  message(STATUS " Architecture NOT able to do coherent DMA (check util/udma_barrier.h) some providers disabled!")
endif()
if (NOT HAVE_STDATOMIC)
  message(STATUS " C11 stdatomic.h NOT available (old compiler)")
endif()
if (NOT HAVE_STATIC_ASSERT)
  message(STATUS " C11 static_assert NOT available (old compiler)")
endif()
if (NOT HAVE_WORKING_STRICT_ALIASING)
  message(STATUS " Compiler cannot do strict aliasing")
endif()
if (NOT HAVE_VALGRIND_MEMCHECK)
  message(STATUS " Valgrind memcheck.h NOT enabled")
endif()
if (NOT HAVE_VALGRIND_DRD)
  message(STATUS " Valgrind drd.h NOT enabled")
endif()
if (NL_KIND EQUAL 0)
  message(STATUS " neighbour resolution NOT enabled")
else()
  if (NOT HAVE_WORKING_IF_H)
    message(STATUS " netlink/route/link.h and net/if.h NOT co-includable (old headers)")
  endif()
endif()
if (NO_MAN_PAGES)
  message(STATUS " man pages NOT built")
else()
  if (NOT PANDOC_FOUND)
    if (NOT EXISTS "${PROJECT_SOURCE_DIR}/buildlib/pandoc-prebuilt")
      message(STATUS " pandoc NOT found and NO prebuilt man pages. 'install' disabled")
    else()
      message(STATUS " pandoc NOT found (using prebuilt man pages)")
    endif()
  endif()
  if (NOT RST2MAN_FOUND)
    if (NOT EXISTS "${PROJECT_SOURCE_DIR}/buildlib/pandoc-prebuilt")
      message(STATUS " rst2man NOT found and NO prebuilt man pages. 'install' disabled")
    else()
      message(STATUS " rst2man NOT found (using prebuilt man pages)")
    endif()
  endif()
endif()
if (NOT CYTHON_EXECUTABLE)
  message(STATUS " cython NOT found (disabling pyverbs)")
endif()
if (NOT SYSTEMD_FOUND)
  message(STATUS " libsystemd NOT found (disabling features)")
endif()
if (NOT UDEV_FOUND)
  message(STATUS " libudev NOT found (disabling features)")
endif()
if (NOT HAVE_C_WARNINGS)
  message(STATUS " extended C warnings NOT supported")
endif()
if (NOT HAVE_NO_STRICT_ALIASING)
  message(STATUS " -fno-strict-aliasing NOT supported")
endif()
if (NOT HAVE_C_WORKING_MISSING_FIELD_INITIALIZERS)
  message(STATUS " -Wmissing-field-initializers does NOT work")
endif()
if (NOT HAVE_C_WORKING_SHADOW)
  message(STATUS " -Wshadow does NOT work")
endif()
if (NOT HAVE_C_WREDUNDANT_DECLS)
  message(STATUS " -Wredundant-decls does NOT work")
endif()
if (NOT HAVE_GLIBC_UAPI_COMPAT)
  message(STATUS " libc netinet/in.h and linux/in.h do NOT coexist")
endif()
if (NOT HAVE_TARGET_SSE)
  message(STATUS " attribute(target(\"sse\")) does NOT work")
endif()
if (NOT DRM_INCLUDE_DIRS)
  message(STATUS " DMABUF NOT supported (disabling some tests)")
endif()
if (NOT HAVE_GLIBC_HWCAP_S390_PCI_MIO )
  message(STATUS " Glibc version does not contain the HWCAP_S390_PCI_MIO bit, using shim version")
endif()