Commit db02be85 authored by Brad King's avatar Brad King

VS: Provide the default platform name to project code

The value of `CMAKE_VS_PLATFORM_NAME` is computed by Visual Studio
generators based on `CMAKE_GENERATOR_PLATFORM` or some default.
Prior to the VS 2019 generator, the default was always `Win32`.
However, for the `Visual Studio 16 2019` generator, the default is
based on the host platform.

Store the default in a new `CMAKE_VS_PLATFORM_NAME_DEFAULT` variable for
use by project code.  This is particularly useful in toolchain files
because they are allowed to set `CMAKE_GENERATOR_PLATFORM` and so
`CMAKE_VS_PLATFORM_NAME` is not yet known.  Of course the toolchain file
author knows whether it will set `CMAKE_GENERATOR_PLATFORM`, and if not
then `CMAKE_VS_PLATFORM_NAME_DEFAULT` provides the platform name that
will be used.

Fixes: #19177
parent 5e981116
......@@ -28,7 +28,8 @@ by default.
Platform Selection
The default target platform name (architecture) is that of the host.
The default target platform name (architecture) is that of the host
and is provided in the :variable:`CMAKE_VS_PLATFORM_NAME_DEFAULT` variable.
The :variable:`CMAKE_GENERATOR_PLATFORM` variable may be set, perhaps
via the :manual:`cmake(1)` ``-A`` option, to specify a target platform
......@@ -105,6 +105,7 @@ Variables that Provide Information
......@@ -137,6 +137,10 @@ Variables
relocatable and reproducible builds that are invariant of the build
* A :variable:`CMAKE_VS_PLATFORM_NAME_DEFAULT` variable was added for
:ref:`Visual Studio Generators` to report their default platform used
when :variable:`CMAKE_GENERATOR_PLATFORM` is not set explicitly.
......@@ -391,3 +395,10 @@ Changes made since CMake 3.14.0 include the following.
our conventions. 3.14.1 revises the module to use ``Fontconfig_*``
variable names. This is incompatible with 3.14.0 but since the
module is new in the 3.14 series usage should not yet be widespread.
* The :variable:`CMAKE_VS_PLATFORM_NAME_DEFAULT` variable was added
to help toolchain files work with the :generator:`Visual Studio 16 2019`
generator where the default platform now depends on the host platform.
Visual Studio target platform name.
Visual Studio target platform name used by the current generator.
VS 8 and above allow project files to specify a target platform.
CMake provides the name of the chosen platform in this variable.
See the :variable:`CMAKE_GENERATOR_PLATFORM` variable for details.
See also the :variable:`CMAKE_VS_PLATFORM_NAME_DEFAULT` variable.
Default for the Visual Studio target platform name for the current generator
without considering the value of the :variable:`CMAKE_GENERATOR_PLATFORM`
variable. For :ref:`Visual Studio Generators` for VS 2017 and below this is
always ``Win32``. For VS 2019 and above this is based on the host platform.
See also the :variable:`CMAKE_VS_PLATFORM_NAME` variable.
......@@ -101,7 +101,7 @@ void cmGlobalVisualStudio7Generator::EnableLanguage(
// Create list of configurations requested by user's cache, if any.
this->cmGlobalGenerator::EnableLanguage(lang, mf, optional);
this->cmGlobalVisualStudioGenerator::EnableLanguage(lang, mf, optional);
// if this environment variable is set, then copy it to
// a static cache entry. It will be used by
......@@ -52,6 +52,14 @@ void cmGlobalVisualStudioGenerator::SetVersion(VSVersion v)
this->Version = v;
void cmGlobalVisualStudioGenerator::EnableLanguage(
std::vector<std::string> const& lang, cmMakefile* mf, bool optional)
this->cmGlobalGenerator::EnableLanguage(lang, mf, optional);
bool cmGlobalVisualStudioGenerator::SetGeneratorPlatform(std::string const& p,
cmMakefile* mf)
......@@ -50,6 +50,9 @@ public:
/** Is the installed VS an Express edition? */
bool IsExpressEdition() const { return this->ExpressEdition; }
void EnableLanguage(std::vector<std::string> const& languages, cmMakefile*,
bool optional) override;
bool SetGeneratorPlatform(std::string const& p, cmMakefile* mf) override;
CMake Error at TestPlatformToolchain.cmake:[0-9]+ \(message\):
CMAKE_GENERATOR_PLATFORM is "Test Platform" as expected.
Call Stack \(most recent call first\):
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