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CMake: Teach qt_internal_add_simd to exclude given osx architectures

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qt_internal_add_simd can now take an EXCLUDE_OSX_ARCHITECTURES list of
values which specifies for which architectures the simd compile flags
should not be added.
This is relevant for macOS universal builds.

Example

CMAKE_OSX_ARCHITECTURES is "x86_64;arm64"
EXCLUDE_OSX_ARCHITECTURES is "arm64"
SIMD is avx2
the final compiler flags that will be added are "-Xarch_x86_64 -mavx2"

Slightly, clean up the function implementation and document its
arguments.

NAME handling has been removed because it's dead code that hasn't been
removed as part of 1b7008a3d7.

Task-number: QTBUG-85447
Change-Id: I395c19bdd67219bebb6b5b8d9f418b6e6488e09b
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
This commit is contained in:
Alexandru Croitor 2021-03-26 11:52:54 +01:00
parent 0592123a0c
commit 6fd8748f88
1 changed files with 29 additions and 9 deletions
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38
cmake/QtSimdHelpers.cmake
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@ -1,9 +1,20 @@
# Handle files that need special SIMD-related flags.
# This creates an object library and makes target link
# to it (privately).
#
# This function adds the passed source files to the given target only if the SIMD specific condition
# evaluates to true. It also adds the SIMD architecture specific flags as compile options to those
# source files.
#
# Arguments
# NAME: is deprecated, don't use it.
# SIMD: name of the simd architecture, e.g. sse2, avx, neon. A Qt feature named QT_FEATURE_foo
# should exist, as well as QT_CFLAGS_foo assignment in QtCompilerOptimization.cmake.
# COMPILE_FLAGS: extra compile flags to set for the passed source files
# EXCLUDE_OSX_ARCHITECTURES: On apple platforms, specifies which architectures should not get the
# SIMD compiler flags. This is mostly relevant for fat / universal builds
#
function(qt_internal_add_simd_part target)
qt_parse_all_arguments(arg "qt_add_simd_part" "" ""
"NAME;SIMD;${__default_private_args};COMPILE_FLAGS" ${ARGN})
qt_parse_all_arguments(arg "qt_add_simd_part" "" "NAME;SIMD"
"${__default_private_args};COMPILE_FLAGS;EXCLUDE_OSX_ARCHITECTURES" ${ARGN})
if ("x${arg_SIMD}" STREQUAL x)
message(FATAL_ERROR "qt_add_simd_part needs a SIMD type to be set.")
endif()
@ -49,11 +60,6 @@ function(qt_internal_add_simd_part target)
list(REMOVE_DUPLICATES simd_flags_expanded)
endif()
set(name "${arg_NAME}")
if("x${name}" STREQUAL x)
set(name "${target}_simd_${arg_SIMD}")
endif()
qt_evaluate_config_expression(result ${condition})
if(${result})
if(QT_CMAKE_DEBUG_EXTEND_TARGET)
@ -64,6 +70,20 @@ function(qt_internal_add_simd_part target)
set(simd_flags_expanded "${${simd_flags_var_name}}")
endif()
# If requested, don't pass the simd specific flags to excluded arches on apple platforms.
# Mostly important for universal / fat builds.
get_target_property(osx_architectures ${target} OSX_ARCHITECTURES)
if(simd_flags_expanded AND osx_architectures AND arg_EXCLUDE_OSX_ARCHITECTURES)
list(REMOVE_ITEM osx_architectures ${arg_EXCLUDE_OSX_ARCHITECTURES})
# Assumes that simd_flags_expanded contains only one item on apple platforms.
list(TRANSFORM osx_architectures
REPLACE "^(.+)$" "-Xarch_\\1;${simd_flags_expanded}"
OUTPUT_VARIABLE simd_flags_expanded)
endif()
# The manual loop is done on purpose. Check Gerrit comments for
# 1b7008a3d784f3f266368f824cb43d473a301ba1.
foreach(source IN LISTS arg_SOURCES)
set_property(SOURCE "${source}" APPEND
PROPERTY COMPILE_OPTIONS