Search path environment variables for cross-compilers.  See the discussion
at <http://gcc.gnu.org/ml/gcc/2013-02/msg00124.html>.

--- gcc-4.7.2/gcc/incpath.c	2012-01-27 00:34:58.000000000 +0100
+++ gcc-4.7.2/gcc/incpath.c	2013-02-12 10:11:27.000000000 +0100
@@ -452,7 +452,7 @@ register_include_chains (cpp_reader *pfi
 
   /* CPATH and language-dependent environment variables may add to the
      include chain.  */
-  add_env_var_paths ("CPATH", BRACKET);
+  add_env_var_paths ("CROSS_CPATH", BRACKET);
   add_env_var_paths (lang_env_vars[idx], SYSTEM);
 
   target_c_incpath.extra_pre_includes (sysroot, iprefix, stdinc);

--- gcc-4.7.2/gcc/system.h	2012-02-17 00:16:28.000000000 +0100
+++ gcc-4.7.2/gcc/system.h	2013-02-12 10:22:17.000000000 +0100
@@ -1023,4 +1023,6 @@ helper_const_non_const_cast (const char
 #define DEBUG_VARIABLE
 #endif
 
+#define LIBRARY_PATH_ENV "CROSS_LIBRARY_PATH"
+
 #endif /* ! GCC_SYSTEM_H */

--- gcc-4.7.2/gcc/tlink.c	2012-02-11 09:50:23.000000000 +0100
+++ gcc-4.7.2/gcc/tlink.c	2013-05-23 22:06:19.000000000 +0200
@@ -461,7 +461,7 @@ recompile_files (void)
   file *f;
 
   putenv (xstrdup ("COMPILER_PATH="));
-  putenv (xstrdup ("LIBRARY_PATH="));
+  putenv (xstrdup (LIBRARY_PATH_ENV "="));
 
   while ((f = file_pop ()) != NULL)
     {

--- gcc-4.7.3/gcc/gcc.c	2013-03-08 08:25:09.000000000 +0100
+++ gcc-4.7.3/gcc/gcc.c	2013-05-24 08:58:16.000000000 +0200
@@ -3726,7 +3726,7 @@ process_command (unsigned int decoded_op
     }
 
   temp = getenv (LIBRARY_PATH_ENV);
-  if (temp && *cross_compile == '0')
+  if (temp)
     {
       const char *startp, *endp;
       char *nstore = (char *) alloca (strlen (temp) + 3);
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<div class='path'>path: <a href='/guix/log/?id=26410b475923f7280203c0f74dcc0b6390de7b60'>root</a>/<a href='/guix/log/gnu?id=26410b475923f7280203c0f74dcc0b6390de7b60'>gnu</a>/<a href='/guix/log/gnu/system?id=26410b475923f7280203c0f74dcc0b6390de7b60'>system</a>/<a href='/guix/log/gnu/system/shadow.scm?id=26410b475923f7280203c0f74dcc0b6390de7b60'>shadow.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/system/shadow.scm?id=26410b475923f7280203c0f74dcc0b6390de7b60&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-02-03 09:57:35 +0000'>2021-02-03</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=e740cc614096e768813280c718f9e96343ba41b3'>Merge branch 'master' into core-updates</a></td><td>Christopher Baines</td></tr>
<tr><td><span title='2021-01-20 09:04:59 +0100'>2021-01-20</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=6c5112dbb32c217abf09ff8ff9bf8c47d0aea651'>services: Do not warn, when duplicate users are eq?.</a><span class='msg-avail'>...</span></td><td>Leo Prikler</td></tr>
<tr><td><span title='2021-01-20 09:04:57 +0100'>2021-01-20</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=239af11a69a588f109d1dcd195f9abe9940cce8c'>shadow: End duplicate warnings with new lines.</a><span class='msg-avail'>...</span></td><td>Leo Prikler</td></tr>
<tr><td><span title='2021-01-13 00:44:34 +0100'>2021-01-13</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=645a28ee97a8708598643941456ba4310fab951b'>Reapply "system: Assert, that user and group names are unique."</a><span class='msg-avail'>...</span></td><td>Leo Prikler</td></tr>
<tr><td><span title='2021-01-12 23:53:53 +0100'>2021-01-12</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=8488f45b6e05d646224cc2b410497ddf9864c612'>Revert "system: Assert, that user and group names are unique."</a><span class='msg-avail'>...</span></td><td>Jonathan Brielmaier</td></tr>
<tr><td><span title='2021-01-11 16:03:47 +0100'>2021-01-11</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=a3002104a84c60556b6616d100cb98019e48759d'>system: Assert, that user and group names are unique.</a><span class='msg-avail'>...</span></td><td>Leo Prikler</td></tr>
<tr><td><span title='2020-08-25 12:39:11 +0200'>2020-08-25</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=dac7dd1b0b40c9f8c81b5147c68f6387c2b16bfd'>Remove "guile-zlib" extension when unused.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-08-25 11:53:20 +0200'>2020-08-25</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=755f365b02b42a5d1e8ef3000dadef069553a478'>linux-libre: Support module compression.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-08-16 15:26:26 -0400'>2020-08-16</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=720a4adc91c632e097d9e064ce8e95617cf76fb0'>system: Modify GDB skeleton to find debug files for any profile.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2020-05-08 16:30:50 +0200'>2020-05-08</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=dd0804c67e99914eecc471fdb92f4220425a1cbc'>services: Add descriptions.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-04-17 23:18:32 +0200'>2020-04-17</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=1e7281108be5fc37daa4cc180e0effdeb4c1a960'>services: account: Have 'user-processes' depend on 'user-homes'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-04-01 07:50:48 +0300'>2020-04-01</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=f12bd0bedde4fb6476064c5e2b32642c49857510'>system: Move nanorc to XDG_CONFIG_HOME.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-03-30 16:02:38 -0400'>2020-03-30</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=49d20d51e9f0b2944b0e13366d042950554ca931'>Revert "system: Move nanorc to XDG_CONFIG_HOME."</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2020-03-30 15:40:30 +0300'>2020-03-30</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=bd71818df31364bbd04f3f13b3bbb251636748b4'>system: Move nanorc to XDG_CONFIG_HOME.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-03-19 12:14:19 +0100'>2020-03-19</span></td><td><a href='/guix/commit/gnu/system/shadow.scm?id=ac75bd010260f6a722e1723b35992b04fd79d44c'>gnu: system: Remove guile-wm from skeleton.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>