nixpkgs/pkgs/development/compilers/gcc/no-sys-dirs.patch

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diff -ru -x '*~' gcc-4.8.3-orig/gcc/cppdefault.c gcc-4.8.3/gcc/cppdefault.c
--- gcc-4.8.3-orig/gcc/cppdefault.c 2013-01-10 21:38:27.000000000 +0100
+++ gcc-4.8.3/gcc/cppdefault.c 2014-08-18 16:20:32.893944536 +0200
@@ -35,6 +35,8 @@
# undef CROSS_INCLUDE_DIR
#endif
+#undef LOCAL_INCLUDE_DIR
+
const struct default_include cpp_include_defaults[]
#ifdef INCLUDE_DEFAULTS
= INCLUDE_DEFAULTS;
diff -ru -x '*~' gcc-4.8.3-orig/gcc/gcc.c gcc-4.8.3/gcc/gcc.c
--- gcc-4.8.3-orig/gcc/gcc.c 2014-03-23 12:30:57.000000000 +0100
+++ gcc-4.8.3/gcc/gcc.c 2014-08-18 13:19:32.689201690 +0200
@@ -1162,10 +1162,10 @@
/* Default prefixes to attach to command names. */
#ifndef STANDARD_STARTFILE_PREFIX_1
-#define STANDARD_STARTFILE_PREFIX_1 "/lib/"
+#define STANDARD_STARTFILE_PREFIX_1 ""
#endif
#ifndef STANDARD_STARTFILE_PREFIX_2
-#define STANDARD_STARTFILE_PREFIX_2 "/usr/lib/"
+#define STANDARD_STARTFILE_PREFIX_2 ""
#endif
#ifdef CROSS_DIRECTORY_STRUCTURE /* Don't use these prefixes for a cross compiler. */