================
@@ -79,6 +79,64 @@ function(llvm_update_compile_flags name)
target_compile_definitions(${name} PRIVATE ${LLVM_COMPILE_DEFINITIONS})
endfunction()
+function(llvm_update_pch name)
+ if(LLVM_REQUIRES_RTTI OR LLVM_REQUIRES_EH)
+ # Non-default RTTI/EH results in incompatible flags, precluding PCH reuse.
+ set(ARG_DISABLE_PCH_REUSE ON)
+ endif()
+
+ if(NOT ARG_PRECOMPILE_HEADERS)
+ # We only use PCH for C++. For targets with C source files that re-use a
+ # precompiled headers from another target, CMake complains that there is no
+ # PCH for C. There doesn't seem to be a disable PCH reuse for C files only,
+ # so disable PCH reuse for targets that contain C sources.
+ get_property(srcs TARGET ${name} PROPERTY SOURCES)
+ foreach(src ${srcs})
+ get_filename_component(extension ${src} EXT)
+ if(extension STREQUAL ".c")
+ message(DEBUG "Disable PCH for ${name} due to C file ${src}")
----------------
Teemperor wrote:
I think this also needs a case for ".mm" as LLDB uses a few Objective-C++ files
which are also an incompatible language mode with the rest of LLVM.
https://github.com/llvm/llvm-project/pull/176420
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