<rdar://problem/6940611> libLTO.dylib needs to let linker specify path to assembler

Add lto_codegen_set_assembler_path() API which allows the linker to specify the
path to the assembler tool to run.  When assembler is used (instead of compiler)
different command line options are used.
Add LTO_API_VERSION #define so clients (linkers) can conditionalize use of new APIs.

llvm-svn: 72823

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/include/llvm-c/lto.h b/llvm/include/llvm-c/lto.h
index 81986176908..5d92fc5af01 100644
--- a/llvm/include/llvm-c/lto.h
+++ b/llvm/include/llvm-c/lto.h
@@ -19,6 +19,8 @@
 #include <stdbool.h>
 #include <stddef.h>
 
+#define LTO_API_VERSION 3
+
 typedef enum {
     LTO_SYMBOL_ALIGNMENT_MASK         = 0x0000001F,    /* log2 of alignment */
     LTO_SYMBOL_PERMISSIONS_MASK       = 0x000000E0,    
@@ -208,6 +210,14 @@ lto_codegen_set_gcc_path(lto_code_gen_t cg, const char* path);
 
 
 /**
+ * Sets the location of the assembler tool to run. If not set, libLTO
+ * will use gcc to invoke the assembler.
+ */
+extern void
+lto_codegen_set_assembler_path(lto_code_gen_t cg, const char* path);
+
+
+/**
  * Adds to a list of all global symbols that must exist in the final
  * generated code.  If a function is not listed, it might be
  * inlined into every usage and optimized away.