commit 6fade5a6044b7102758f4ca66c8715ebc12a6306

Author: Martin Liska <mliska@suse.cz>

Date:   Thu Oct 22 14:07:29 2020 +0200

    LTO: check that make command works

    gcc/ChangeLog:

            PR lto/97524

            * lto-wrapper.c (make_exists): New function.

            (run_gcc): Use it to check that make is present and working

            for parallel execution.

--- gcc/lto-wrapper.c

+++ gcc/lto-wrapper.c

@@ -1321,6 +1321,26 @@ jobserver_active_p (void)

 	  && is_valid_fd (wfd));

 }

+/* Test that a make command is present and working, return true if so.  */

+

+static bool

+make_exists (void)

+{

+  const char *make = "make";

+  char **make_argv = buildargv (getenv ("MAKE"));

+  if (make_argv)

+    make = make_argv[0];

+  const char *make_args[] = {make, "--version", NULL};

+

+  int exit_status = 0;

+  int err = 0;

+  const char *errmsg

+    = pex_one (PEX_SEARCH, make_args[0], CONST_CAST (char **, make_args),

+	       "make", NULL, NULL, &exit_status, &err;;

+  freeargv (make_argv);

+  return errmsg == NULL && exit_status == 0 && err == 0;

+}

+

 /* Execute gcc. ARGC is the number of arguments. ARGV contains the arguments. */

 static void

@@ -1541,6 +1561,10 @@ run_gcc (unsigned argc, char *argv[])

       jobserver = 1;

     }

+  /* We need make working for a parallel execution.  */

+  if (parallel && !make_exists ())

+    parallel = 0;

+

   if (linker_output)

     {

       char *output_dir, *base, *name;