LTO: expose LTO_SYMBOL_ALIAS, which indicates that the symbol is an alias.

This is needed for COFF linkers to distinguish between weak external aliases
and regular symbols with LLVM weak linkage, which are represented as strong
symbols in COFF.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241389 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm-c/lto.h b/include/llvm-c/lto.h
index 42c05a2fc59e73a3b8e49bb93e294038c2656a21..cb3a69160454a29b464aea3c949ea7c05fa9c794 100644 (file)
--- a/include/llvm-c/lto.h
+++ b/include/llvm-c/lto.h
@@ -40,7 +40,7 @@ typedef bool lto_bool_t;
  * @{
  */
 
-#define LTO_API_VERSION 16
+#define LTO_API_VERSION 17
 
 /**
  * \since prior to LTO_API_VERSION=3
@@ -63,7 +63,8 @@ typedef enum {
     LTO_SYMBOL_SCOPE_PROTECTED             = 0x00002000,
     LTO_SYMBOL_SCOPE_DEFAULT               = 0x00001800,
     LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN = 0x00002800,
-    LTO_SYMBOL_COMDAT                      = 0x00004000
+    LTO_SYMBOL_COMDAT                      = 0x00004000,
+    LTO_SYMBOL_ALIAS                       = 0x00008000
 } lto_symbol_attributes;
 
 /**

diff --git a/lib/LTO/LTOModule.cpp b/lib/LTO/LTOModule.cpp
index 6131c3180249ded2331ad3e122cef53cd896bf21..53ed4175f8e35463e9826858ff84efdf5046a6d8 100644 (file)
--- a/lib/LTO/LTOModule.cpp
+++ b/lib/LTO/LTOModule.cpp
@@ -473,6 +473,9 @@ void LTOModule::addDefinedSymbol(const char *Name, const GlobalValue *def,
   if (def->hasComdat())
     attr |= LTO_SYMBOL_COMDAT;
 
+  if (isa<GlobalAlias>(def))
+    attr |= LTO_SYMBOL_ALIAS;
+
   auto Iter = _defines.insert(Name).first;
 
   // fill information structure