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Xcode: Explicitly specify default native architecture on macOS

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When `CMAKE_OSX_ARCHITECTURES` is not specified, we add the Xcode
setting `ONLY_ACTIVE_ARCH = YES` with the intention of targeting the
native architecture of the host.  However, the default `ARCHS` value
chosen by "Xcode 12 Universal Apps" includes multiple architectures.
Add an explicit `ARCHS` setting with value `$(NATIVE_ARCH_ACTUAL)`
to tell Xcode to use the host's native architecture only.

Fixes: #20893
This commit is contained in:
Brad King 2020-07-16 11:46:53 -04:00
parent ce624cfbd4
commit 26673bf480
4 changed files with 32 additions and 1 deletions
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14
Help/release/3.18.rst
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@ -318,3 +318,17 @@ Other Changes
* The :manual:`cmake-file-api(7)` "codemodel" version 2 "target" object gained
a new ``precompileHeaders`` field in the ``compileGroups`` objects.
Updates
=======
Changes made since CMake 3.18.0 include the following.
3.18.1
------
* The :generator:`Xcode` generator, when :variable:`CMAKE_OSX_ARCHITECTURES`
is not defined, now selects ``$(NATIVE_ARCH_ACTUAL)`` as the default
architecture (the Xcode ``ARCHS`` setting). This is needed for Xcode 12
to select the host's architecture, which older versions of Xcode did
by default.

6
Modules/CMakeDetermineCompilerId.cmake
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@ -469,6 +469,12 @@ Id flags: ${testflags} ${CMAKE_${lang}_COMPILER_ID_FLAGS_ALWAYS}
set(id_clang_cxx_library "CLANG_CXX_LIBRARY = \"${CMAKE_MATCH_3}\";")
endif()
endif()
if(CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND CMAKE_OSX_SYSROOT MATCHES "^$|[Mm][Aa][Cc][Oo][Ss]")
# When targeting macOS, use only the host architecture.
set(id_archs [[ARCHS = "$(NATIVE_ARCH_ACTUAL)";]])
else()
set(id_archs "")
endif()
configure_file(${CMAKE_ROOT}/Modules/CompilerId/Xcode-3.pbxproj.in
${id_dir}/CompilerId${lang}.xcodeproj/project.pbxproj @ONLY)
unset(_ENV_MACOSX_DEPLOYMENT_TARGET)

1
Modules/CompilerId/Xcode-3.pbxproj.in
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@ -84,6 +84,7 @@
CODE_SIGNING_REQUIRED = NO;
CONFIGURATION_BUILD_DIR = "$(BUILD_DIR)";
SYMROOT = .;
@id_archs@
@id_toolset@
@id_lang_version@
@id_clang_cxx_library@

12
Source/cmGlobalXCodeGenerator.cxx
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@ -12,6 +12,7 @@
#include <cm/memory>
#include <cmext/algorithm>
#include <cmext/string_view>
#include "cmsys/RegularExpression.hxx"
@ -3118,6 +3119,14 @@ bool cmGlobalXCodeGenerator::CreateXCodeObjects(
if (archs.empty()) {
// Tell Xcode to use NATIVE_ARCH instead of ARCHS.
buildSettings->AddAttribute("ONLY_ACTIVE_ARCH", this->CreateString("YES"));
// When targeting macOS, use only the host architecture.
if (this->SystemName == "Darwin"_s &&
(!sysroot || !*sysroot ||
cmSystemTools::LowerCase(sysroot).find("macos") !=
std::string::npos)) {
buildSettings->AddAttribute("ARCHS",
this->CreateString("$(NATIVE_ARCH_ACTUAL)"));
}
} else {
// Tell Xcode to use ARCHS (ONLY_ACTIVE_ARCH defaults to NO).
buildSettings->AddAttribute("ARCHS", this->CreateString(archs));
@ -3217,7 +3226,8 @@ void cmGlobalXCodeGenerator::ComputeArchitectures(cmMakefile* mf)
}
if (this->Architectures.empty()) {
// With no ARCHS we use ONLY_ACTIVE_ARCH.
// With no ARCHS we use ONLY_ACTIVE_ARCH and possibly a
// platform-specific default ARCHS placeholder value.
// Look up the arch that Xcode chooses in this case.
if (const char* arch = mf->GetDefinition("CMAKE_XCODE_ARCHS")) {
this->ObjectDirArchDefault = arch;