jit: supply MULTILIB_DEFAULTS as arguments when invoking driver

gcc/jit/ChangeLog:
	* jit-playback.c (invoke_driver): Convert local "argvec"
	to an auto_argvec, so that it owns copies of the strings,
	rather than borrows them, updating ADD_ARG to use xstrdup
	and special-casing the NULL terminator to avoid
	xstrdup (NULL).  Call add_multilib_driver_arguments at the front
	of the arguments.
	(MULTILIB_DEFAULTS): Provide a default definition.
	(multilib_defaults_raw): New constant array.
	(gcc::jit::playback::context::add_multilib_driver_arguments): New
	method.
	* jit-playback.h
	(gcc::jit::playback::context::add_multilib_driver_arguments): New
	method.
	* docs/internals/test-hello-world.exe.log.txt: Update.
	* docs/_build/texinfo/libgccjit.texi: Regenerate.

From-SVN: r226126

1 files changed, 35 insertions, 3 deletions

diff --git a/gcc/jit/jit-playback.c b/gcc/jit/jit-playback.c
index 8d0c210..c469863 100644
--- a/gcc/jit/jit-playback.c
+++ b/gcc/jit/jit-playback.c
@@ -2382,14 +2382,16 @@ invoke_driver (const char *ctxt_progname,
      TV_ASSEMBLE.  */
   auto_timevar assemble_timevar (tv_id);
   const char *errmsg;
-  auto_vec <const char *> argvec;
-#define ADD_ARG(arg) argvec.safe_push (arg)
+  auto_argvec argvec;
+#define ADD_ARG(arg) argvec.safe_push (xstrdup (arg))
   int exit_status = 0;
   int err = 0;
   const char *gcc_driver_name = GCC_DRIVER_NAME;
 
   ADD_ARG (gcc_driver_name);
 
+  add_multilib_driver_arguments (&argvec);
+
   if (shared)
     ADD_ARG ("-shared");
 
@@ -2410,7 +2412,7 @@ invoke_driver (const char *ctxt_progname,
   ADD_ARG ("-fno-use-linker-plugin");
 
   /* pex argv arrays are NULL-terminated.  */
-  ADD_ARG (NULL);
+  argvec.safe_push (NULL);
 
   /* pex_one's error-handling requires pname to be non-NULL.  */
   gcc_assert (ctxt_progname);
@@ -2451,6 +2453,36 @@ invoke_driver (const char *ctxt_progname,
 #undef ADD_ARG
 }
 
+/* Extract the target-specific MULTILIB_DEFAULTS to
+   multilib_defaults_raw for use by
+   playback::context::add_multilib_driver_arguments ().  */
+
+#ifndef MULTILIB_DEFAULTS
+#define MULTILIB_DEFAULTS { "" }
+#endif
+
+static const char *const multilib_defaults_raw[] = MULTILIB_DEFAULTS;
+
+/* Helper function for playback::context::invoke_driver ().
+
+   32-bit and 64-bit multilib peer builds of libgccjit.so may share
+   a driver binary.  We need to pass in options to the shared driver
+   to get the appropriate assembler/linker options for this multilib
+   peer.  */
+
+void
+playback::context::
+add_multilib_driver_arguments (vec <char *> *argvec)
+{
+  JIT_LOG_SCOPE (get_logger ());
+
+  /* Add copies of the arguments in multilib_defaults_raw to argvec,
+     prepending each with a "-".  */
+  for (size_t i = 0; i < ARRAY_SIZE (multilib_defaults_raw); i++)
+    if (multilib_defaults_raw[i][0])
+      argvec->safe_push (concat ("-", multilib_defaults_raw[i], NULL));
+}
+
 /* Dynamically-link the built DSO file into this process, using dlopen.
    Wrap it up within a jit::result *, and return that.
    Return NULL if any errors occur, reporting them on this context.  */