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cmake: add support for choosing 'ld' via -DUSE_LD 

This introduces a new USE_LD cached variable which can be set to one of
three values: LD, GOLD, or LLD. In the latter two cases, we propagate
the -fuse-ld={gold,lld} option to the compiler. The default case
defaults to whatever the ordinary system linker is, i.e. it does
nothing.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
This commit is contained in:
Austin Seipp 2019-05-12 12:41:04 -05:00 committed by Alex Miller
parent a9b03ec505
commit ee1e3f620a
1 changed files with 22 additions and 7 deletions
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29
cmake/ConfigureCompiler.cmake
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@ -1,10 +1,11 @@
set(USE_GPERFTOOLS OFF CACHE BOOL "Use gperfools for profiling")
set(PORTABLE_BINARY OFF CACHE BOOL "Create a binary that runs on older OS versions")
set(USE_VALGRIND OFF CACHE BOOL "Compile for valgrind usage")
set(USE_GOLD_LINKER OFF CACHE BOOL "Use gold linker")
set(ALLOC_INSTRUMENTATION OFF CACHE BOOL "Instrument alloc")
set(WITH_UNDODB OFF CACHE BOOL "Use rr or undodb")
set(USE_ASAN OFF CACHE BOOL "Compile with address sanitizer")
set(FDB_RELEASE OFF CACHE BOOL "This is a building of a final release")
set(USE_LD "LD" CACHE STRING "The linker to use for building: can be LD (system default, default choice), GOLD, or LLD")
if(USE_GPERFTOOLS)
find_package(Gperftools REQUIRED)
@ -47,7 +48,6 @@ include(CheckFunctionExists)
set(CMAKE_REQUIRED_INCLUDES stdlib.h malloc.h)
set(CMAKE_REQUIRED_LIBRARIES c)
if(WIN32)
# see: https://docs.microsoft.com/en-us/windows/desktop/WinProg/using-the-windows-headers
# this sets the windows target version to Windows 7
@ -55,10 +55,6 @@ if(WIN32)
add_compile_options(/W3 /EHsc /std:c++17 /bigobj $<$<CONFIG:Release>:/Zi> /MP)
add_compile_definitions(_WIN32_WINNT=${WINDOWS_TARGET} BOOST_ALL_NO_LIB)
else()
if(USE_GOLD_LINKER)
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=gold -Wl,--disable-new-dtags")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=gold -Wl,--disable-new-dtags")
endif()
set(GCC NO)
set(CLANG NO)
@ -70,10 +66,29 @@ else()
set(GCC YES)
endif()
# check linker flags.
if ((NOT (USE_LD STREQUAL "LD")) AND (NOT (USE_LD STREQUAL "GOLD")) AND (NOT (USE_LD STREQUAL "LLD")))
message (FATAL_ERROR "USE_LD must be set to LD, GOLD, or LLD!")
endif()
# if USE_LD=LD, then we don't do anything, defaulting to whatever system
# linker is available (e.g. binutils doesn't normally exist on macOS, so this
# implies the default xcode linker, and other distros may choose others by
# default).
if(USE_LD STREQUAL "GOLD")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=gold -Wl,--disable-new-dtags")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=gold -Wl,--disable-new-dtags")
endif()
if(USE_LD STREQUAL "LLD")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=lld -Wl,--disable-new-dtags")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=lld -Wl,--disable-new-dtags")
endif()
# we always compile with debug symbols. CPack will strip them out
# and create a debuginfo rpm
add_compile_options(-ggdb)
set(USE_ASAN OFF CACHE BOOL "Compile with address sanitizer")
if(USE_ASAN)
add_compile_options(
-fno-omit-frame-pointer -fsanitize=address