CMake: Split QtBuild.cmake into smaller files

QtBuild.cmake is huge. Split it.

Move module, plugin, tools, executables and test related functions out
of QtBuild.cmake into separate files.
Do the same for many other things too.

An additional requirement is that all the new Helpers files only
define functions and macros.
No global variable definitions are allowed, nor execution of commands
with side effects.

Some notes:
qt_install_qml_files is removed because it's dead code.

Some functions still need to be figured out, because they are
interspersed and depend on various global state assignments.

Task-number: QTBUG-86035
Change-Id: I21d79ff02eef923c202eb1000422888727cb0e2c
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

1 files changed, 81 insertions, 0 deletions

diff --git a/cmake/QtSimdHelpers.cmake b/cmake/QtSimdHelpers.cmake
new file mode 100644
index 0000000000..26a275dc1f
--- /dev/null
+++ b/cmake/QtSimdHelpers.cmake
@@ -0,0 +1,81 @@
+# Handle files that need special SIMD-related flags.
+# This creates an object library and makes target link
+# to it (privately).
+function(qt_add_simd_part target)
+    qt_parse_all_arguments(arg "qt_add_simd_part" "" ""
+       "NAME;SIMD;${__default_private_args};COMPILE_FLAGS" ${ARGN})
+    if ("x${arg_SIMD}" STREQUAL x)
+        message(FATAL_ERROR "qt_add_simd_part needs a SIMD type to be set.")
+    endif()
+
+    set(condition "QT_FEATURE_${arg_SIMD}")
+    string(TOUPPER "QT_CFLAGS_${arg_SIMD}" simd_flags_var_name)
+    set(simd_flags_expanded "")
+
+    # As per mkspecs/features/simd.prf, the arch_haswell SIMD compiler is enabled when
+    # qmake's CONFIG contains "avx2", which maps to CMake's QT_FEATURE_avx2.
+    # The list of dependencies 'avx2 bmi bmi2 f16c fma lzcnt popcnt' only influences whether
+    # the 'arch_haswell' SIMD flags need to be added explicitly to the compiler invocation.
+    # If the compiler adds them implicitly, they must be present in qmake's QT_CPU_FEATURES as
+    # detected by the architecture test, and thus they are present in TEST_subarch_result.
+    if("${arg_SIMD}" STREQUAL arch_haswell)
+        set(condition "QT_FEATURE_avx2")
+
+        # Use avx2 flags as per simd.prf, if there are no specific arch_haswell flags specified in
+        # QtCompilerOptimization.cmake.
+        if("${simd_flags_var_name}" STREQUAL "")
+            set(simd_flags_var_name "QT_CFLAGS_AVX2")
+        endif()
+
+    # The avx512 profiles dependencies DO influence if the SIMD compiler will be executed,
+    # so each of the profile dependencies have to be in qmake's CONFIG for the compiler to be
+    # enabled, which means the CMake features have to evaluate to true.
+    # Also the profile flags to be used are a combination of arch_haswell, avx512f and each of the
+    # dependencies.
+    elseif("${arg_SIMD}" STREQUAL avx512common)
+        set(condition "QT_FEATURE_avx512cd")
+        list(APPEND simd_flags_expanded "${QT_CFLAGS_ARCH_HASWELL}")
+        list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512F}")
+        list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512CD}")
+        list(REMOVE_DUPLICATES simd_flags_expanded)
+    elseif("${arg_SIMD}" STREQUAL avx512core)
+        set(condition "QT_FEATURE_avx512cd AND QT_FEATURE_avx512bw AND QT_FEATURE_avx512dq AND QT_FEATURE_avx512vl")
+        list(APPEND simd_flags_expanded "${QT_CFLAGS_ARCH_HASWELL}")
+        list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512F}")
+        list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512CD}")
+        list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512BW}")
+        list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512DQ}")
+        list(APPEND simd_flags_expanded "${QT_CFLAGS_AVX512VL}")
+        list(REMOVE_DUPLICATES simd_flags_expanded)
+    endif()
+
+    set(name "${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)
+            message("qt_add_simd_part(${target} SIMD ${arg_SIMD} ...): Evaluated")
+        endif()
+
+        if(NOT simd_flags_expanded)
+            set(simd_flags_expanded "${${simd_flags_var_name}}")
+        endif()
+
+        foreach(source IN LISTS arg_SOURCES)
+            set_property(SOURCE "${source}" APPEND
+                PROPERTY COMPILE_OPTIONS
+                ${simd_flags_expanded}
+                ${arg_COMPILE_FLAGS}
+            )
+        endforeach()
+        set_source_files_properties(${arg_SOURCES} PROPERTIES SKIP_PRECOMPILE_HEADERS TRUE)
+        target_sources(${target} PRIVATE ${arg_SOURCES})
+    else()
+        if(QT_CMAKE_DEBUG_EXTEND_TARGET)
+            message("qt_add_simd_part(${target} SIMD ${arg_SIMD} ...): Skipped")
+        endif()
+    endif()
+endfunction()