[libc-commits] [PATCH] D118889: [libc] Disable rtti/expections

[Guillaume Chatelet via Phabricator via libc-commits]

gchatelet created this revision.
gchatelet added a reviewer: sivachandra.
Herald added subscribers: libc-commits, ecnelises, tschuett, mgorny.
Herald added a project: libc-project.
gchatelet requested review of this revision.

llvm-libc exhibits a C interface but its source is C++.
This patch explicitly disables the use of exceptions and RTTI when compiling the entrypoints.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118889

Files:
  libc/cmake/modules/LLVMLibCObjectRules.cmake


Index: libc/cmake/modules/LLVMLibCObjectRules.cmake
===================================================================
--- libc/cmake/modules/LLVMLibCObjectRules.cmake
+++ libc/cmake/modules/LLVMLibCObjectRules.cmake
@@ -5,6 +5,18 @@
   if(NOT ${LIBC_TARGET_OS} STREQUAL "windows")
     set(compile_options ${compile_options} -fpie -ffreestanding)
   endif()
+  if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
+    list(APPEND compile_options "-fno-exceptions")
+    list(APPEND compile_options "-fno-unwind-tables")
+    list(APPEND compile_options "-fno-asynchronous-unwind-tables")
+    list(APPEND compile_options "-fno-rtti")
+  elseif(MSVC)
+    list(APPEND compile_options "/EHs-c-")
+    list(APPEND compile_options "/GR-")
+  elseif(CMAKE_CXX_COMPILER_ID MATCHES "XL")
+    list(APPEND compile_options "-qnoeh")
+    list(APPEND compile_options "-qnortti")
+  endif()
   set(${output_var} ${compile_options} PARENT_SCOPE)
 endfunction()
 


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