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importstd: clarify when the experimental UUID must be available

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Fixes: #25980
This commit is contained in:
Ben Boeckel 2024-05-14 16:03:16 -04:00
parent 5d658ebcc6
commit a46395df06
4 changed files with 5 additions and 4 deletions
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3
Help/dev/experimental.rst
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@ -50,7 +50,8 @@ set
This UUID may change in future versions of CMake. Be sure to use the value
documented here by the source tree of the version of CMake with which you are
experimenting.
experimenting. It must be set before the ``CXX`` toolchain is discovered by
CMake, usually as part of a :command:`project` call.
When activated, this experimental feature provides the following:

2
Modules/Compiler/CMakeCommonCompilerMacros.cmake
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@ -250,7 +250,7 @@ function(cmake_create_cxx_import_std std variable)
_cmake_supported_import_std_experimental)
if (NOT _cmake_supported_import_std_experimental)
set("${variable}"
"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Experimental `import std` support not enabled when detecting toolchain\")\n"
"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Experimental `import std` support not enabled when detecting toolchain; it must be set before `CXX` is enabled (usually a `project()` call)\")\n"
PARENT_SCOPE)
return ()
endif ()

2
Tests/RunCMake/CXXModules/NoCXX23TargetRequired-stderr.txt
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@ -3,7 +3,7 @@ CMake Error in CMakeLists.txt:
the "__CMAKE::CXX23" target exist, but it was not provided by the
toolchain. Reason:
(Toolchain does not support discovering `import std` support|Experimental `import std` support not enabled when detecting toolchain|Unsupported generator: [^\n]*)
(Toolchain does not support discovering `import std` support|Experimental `import std` support not enabled when detecting toolchain; it must be set before `CXX` is enabled \(usually a `project\(\)` call\)|Unsupported generator: [^\n]*)
CMake Generate step failed. Build files cannot be regenerated correctly.

2
Tests/RunCMake/CXXModules/NoCXX26TargetRequired-stderr.txt
View File

@ -3,7 +3,7 @@ CMake Error in CMakeLists.txt:
the "__CMAKE::CXX26" target exist, but it was not provided by the
toolchain. Reason:
(Toolchain does not support discovering `import std` support|Experimental `import std` support not enabled when detecting toolchain|Unsupported generator: [^\n]*)
(Toolchain does not support discovering `import std` support|Experimental `import std` support not enabled when detecting toolchain; it must be set before `CXX` is enabled \(usually a `project\(\)` call\)|Unsupported generator: [^\n]*)
CMake Generate step failed. Build files cannot be regenerated correctly.