Author: Patrick McDermott <patrick.mcdermott@libiquity.com>
Subject: Add another search directory to gcc driver

diff -Naurp src.orig/gcc/gcc.c src/gcc/gcc.c
--- src.orig/gcc/gcc.c	2018-02-09 01:44:06.000000000 -0500
+++ src/gcc/gcc.c	2019-05-02 19:28:55.475950656 -0400
@@ -1496,6 +1496,8 @@ static const char *const standard_libexe
 static const char *const standard_bindir_prefix = STANDARD_BINDIR_PREFIX;
 static const char *const standard_startfile_prefix = STANDARD_STARTFILE_PREFIX;
 
+static const char *const user_tooldir_prefix = USER_TOOLDIR_PREFIX;
+
 /* For native compilers, these are well-known paths containing
    components that may be provided by the system.  For cross
    compilers, these paths are not used.  */
@@ -4304,6 +4306,16 @@ process_command (unsigned int decoded_op
 		  PREFIX_PRIORITY_LAST, 0, 0);
     }
 
+  add_prefix (&exec_prefixes,
+	     concat (user_tooldir_prefix, dir_separator_str, NULL),
+	     0, PREFIX_PRIORITY_LAST, 0, 0);
+  add_prefix (&startfile_prefixes,
+	     concat (user_tooldir_prefix, dir_separator_str, NULL),
+	     0, PREFIX_PRIORITY_LAST, 0, 0);
+  add_prefix (&include_prefixes,
+	     concat (user_tooldir_prefix, dir_separator_str, NULL),
+	     0, PREFIX_PRIORITY_LAST, 0, 0);
+
   /* COMPILER_PATH and LIBRARY_PATH have values
      that are lists of directory names with colons.  */
 
diff -Naurp src.orig/gcc/Makefile.in src/gcc/Makefile.in
--- src.orig/gcc/Makefile.in	2018-03-09 10:24:44.000000000 -0500
+++ src/gcc/Makefile.in	2019-05-02 19:05:56.069075629 -0400
@@ -2186,6 +2186,7 @@ DRIVER_DEFINES = \
   -DDEFAULT_TARGET_MACHINE=\"$(target_noncanonical)\" \
   -DSTANDARD_BINDIR_PREFIX=\"$(bindir)/\" \
   -DTOOLDIR_BASE_PREFIX=\"$(libsubdir_to_prefix)$(prefix_to_exec_prefix)\" \
+  -DUSER_TOOLDIR_PREFIX=\"$(user_tooldir_prefix)\" \
   -DACCEL_DIR_SUFFIX=\"$(accel_dir_suffix)\" \
   @TARGET_SYSTEM_ROOT_DEFINE@ \
   $(VALGRIND_DRIVER_DEFINES) \
diff -Naurp src.orig/Makefile.def src/Makefile.def
--- src.orig/Makefile.def	2017-11-28 05:35:37.000000000 -0500
+++ src/Makefile.def	2019-05-02 19:23:36.588174507 -0400
@@ -229,6 +229,7 @@ flags_to_pass = { flag= sysconfdir ; };
 flags_to_pass = { flag= tooldir ; };
 flags_to_pass = { flag= build_tooldir ; };
 flags_to_pass = { flag= target_alias ; };
+flags_to_pass = { flag= user_tooldir_prefix ; };
 
 // Build tools
 flags_to_pass = { flag= AWK ; };
diff -Naurp src.orig/Makefile.in src/Makefile.in
--- src.orig/Makefile.in	2017-11-28 05:35:37.000000000 -0500
+++ src/Makefile.in	2019-05-02 19:24:29.804137725 -0400
@@ -737,6 +737,7 @@ BASE_FLAGS_TO_PASS = \
 	"tooldir=$(tooldir)" \
 	"build_tooldir=$(build_tooldir)" \
 	"target_alias=$(target_alias)" \
+	"user_tooldir_prefix=$(user_tooldir_prefix)" \
 	"AWK=$(AWK)" \
 	"BISON=$(BISON)" \
 	"CC_FOR_BUILD=$(CC_FOR_BUILD)" \