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[cmake] Use -ffunction-sections and -Wl,--gc-sections on MinGW targets

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If compiling with GCC or linking with ld.bfd, these options have little
effect, but if built with Clang and linked with LLD, they provide a
quite notable size decrease - this shrinks an entire llvm-mingw
distribution package by 22%.

If building with BUILD_SHARED_LIBS or LLVM_BUILD_LLVM_DYLIB with LLD,
this requires a version of LLD that contains a fix for auto exporting
symbols from comdats, 2b01a417d7ccb001ccc1185ef5fdc967c9fac8d7.

Differential Revision: https://reviews.llvm.org/D101568
This commit is contained in:
Martin Storsjö 2021-04-21 08:35:40 +03:00
parent 3bf0debbff
commit eff58ba276
2 changed files with 2 additions and 2 deletions
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2
cmake/modules/AddLLVM.cmake
View File

@ -242,7 +242,7 @@ function(add_link_opts target_name)
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,-z,discard-unused=sections")
endif()
elseif(NOT WIN32 AND NOT CMAKE_SYSTEM_NAME MATCHES "OpenBSD|AIX|OS390")
elseif(NOT MSVC AND NOT CMAKE_SYSTEM_NAME MATCHES "OpenBSD|AIX|OS390")
# TODO Revisit this later on z/OS.
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,--gc-sections")

2
cmake/modules/HandleLLVMOptions.cmake
View File

@ -898,7 +898,7 @@ endif()
# FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF?
# But MinSizeRel seems to add that automatically, so maybe disable these
# flags instead if LLVM_NO_DEAD_STRIP is set.
if(NOT CYGWIN AND NOT WIN32)
if(NOT CYGWIN AND NOT MSVC)
if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND
NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS)