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fileAPI: Expose CMAKE_<LANG>_COMPILER_ARG1

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Compiler arguments coming from CC environment variables or multi-element
CMAKE_<LANG>_COMPILER variables set by toolchain files were previously not
exposed in the file API. Among other possible problems, this caused clients
to determine wrong system include paths and built-in preprocessor macros by
calling the compiler without these important arguments.

This is fixed by adding an optional "commandFragment" attribute to the
compiler description in the `toolchains` object, containing these arguments
as a command line fragment. This is already the form in which they are
internally stored in the CMAKE_<LANG>_COMPILER_ARG1 variable, so all that is
required is adding this variable to the set of exported variables, besides
some logic to omit it if empty.

Issue: #22568
This commit is contained in:
Christian Walther
2025-11-22 08:18:39 +11:00
committed by Craig Scott
parent 1e02926c9a
commit 71a4e34d97
9 changed files with 149 additions and 27 deletions
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2
Source/cmFileAPI.cxx
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@@ -959,7 +959,7 @@ Json::Value cmFileAPI::BuildCMakeFiles(Object object)
// The "toolchains" object kind.
static unsigned int const ToolchainsV1Minor = 0;
static unsigned int const ToolchainsV1Minor = 1;
void cmFileAPI::BuildClientRequestToolchains(
ClientRequest& r, std::vector<RequestVersion> const& versions)