================
@@ -293,6 +255,19 @@ if (NOT(CLANG_DEFAULT_CXX_STDLIB STREQUAL "" OR
"Default C++ stdlib to use (\"libstdc++\" or \"libc++\", empty for
platform default" FORCE)
endif()
+set(CLANG_DEFAULT_C_STDLIB "" CACHE STRING
+ "Default C stdlib to use (\"newlib\", \"newlib-nano\", \"picolibc\",
\"llvm-libc\", or \"system\", empty for platform default)")
+if (NOT(CLANG_DEFAULT_C_STDLIB STREQUAL "" OR
+ CLANG_DEFAULT_C_STDLIB STREQUAL "newlib" OR
+ CLANG_DEFAULT_C_STDLIB STREQUAL "newlib-nano" OR
+ CLANG_DEFAULT_C_STDLIB STREQUAL "picolibc" OR
+ CLANG_DEFAULT_C_STDLIB STREQUAL "llvm-libc" OR
+ CLANG_DEFAULT_C_STDLIB STREQUAL "system"))
+ message(WARNING "Resetting default C stdlib to use platform default")
+ set(CLANG_DEFAULT_C_STDLIB "" CACHE STRING
+ "Default C stdlib to use (\"newlib\", \"newlib-nano\", \"picolibc\",
\"llvm-libc\", or \"system\", empty for platform default)" FORCE)
+endif()
----------------
voltur01 wrote:
Thanks for the reference, I remember similar question was asked in the RFC
itself too.
This is needed to cover one use case: when, e.g. picolibc, is the default its
name is not present anywhere, so `--cstdlib=picolibc` cannot know that it is
the default library and there is nothing to do.
One option is that the default library cannot be targeted with `--cstdlib` or
another option is that there is no default library - one has to always set
`--cstdlib` - both are not very ergonomic.
Let me think if there are other ways to solve this, any ideas would be
appreciated.
https://github.com/llvm/llvm-project/pull/185870
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