GNU bug report logs - #55643
[PATCH] gnu: GCC: Add cross environment variables patch to GCC 12.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Morgan.J.Smith <at> outlook.com
Subject: bug#55643: closed (Re: bug#55643: [PATCH] gnu: GCC: Add cross
 environment variables patch to GCC 12.)
Date: Mon, 30 May 2022 14:09:02 +0000

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Your bug report

#55643: [PATCH] gnu: GCC: Add cross environment variables patch to GCC 12.

which was filed against the guix-patches package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 55643 <at> debbugs.gnu.org.

-- 
55643: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=55643
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Morgan.J.Smith <at> outlook.com
Cc: 55643-done <at> debbugs.gnu.org
Subject: Re: bug#55643: [PATCH] gnu: GCC: Add cross environment variables
 patch to GCC 12.
Date: Mon, 30 May 2022 16:08:30 +0200

Hi Morgan,

Morgan.J.Smith <at> outlook.com skribis:

> From: Morgan Smith <Morgan.J.Smith <at> outlook.com>
>
> * gnu/packages/patches/gcc-12-cross-environment-variables.patch : New file.
> * gnu/local.mk (dist_patch_DATA): Add
> gcc-12-cross-environment-variables.patch.
> * gnu/packages/cross-base.scm (cross-gcc)[source](patches): Apply the patch.

Applied, thanks!

It’s annoying that there’s currently no easy way to test that from the
command line.  For instance, this won’t do what we want:

  guix build --with-c-toolchain=coreutils=gcc-toolchain <at> 12 \
     --target=arm-linux-gnueabihf coreutils

Anyway, future work…

Ludo’.

[Message part 3 (message/rfc822, inline)]

From: Morgan.J.Smith <at> outlook.com
To: guix-patches <at> gnu.org
Cc: Morgan Smith <Morgan.J.Smith <at> outlook.com>
Subject: [PATCH] gnu: GCC: Add cross environment variables patch to GCC 12.
Date: Wed, 25 May 2022 17:37:32 -0400

From: Morgan Smith <Morgan.J.Smith <at> outlook.com>

* gnu/packages/patches/gcc-12-cross-environment-variables.patch : New file.
* gnu/local.mk (dist_patch_DATA): Add
gcc-12-cross-environment-variables.patch.
* gnu/packages/cross-base.scm (cross-gcc)[source](patches): Apply the patch.
---

The files names have changed (gcc.c -> gcc.cc) so we can't keep using the gcc
10 patch.  Tested and working for me

 gnu/local.mk                                  |  1 +
 gnu/packages/cross-base.scm                   |  3 ++
 .../gcc-12-cross-environment-variables.patch  | 54 +++++++++++++++++++
 3 files changed, 58 insertions(+)
 create mode 100644 gnu/packages/patches/gcc-12-cross-environment-variables.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index a4250248ca..0bc45fd26e 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1130,6 +1130,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/gcc-9-strmov-store-file-names.patch	\
   %D%/packages/patches/gcc-12-strmov-store-file-names.patch	\
   %D%/packages/patches/gcc-10-cross-environment-variables.patch \
+  %D%/packages/patches/gcc-12-cross-environment-variables.patch \
   %D%/packages/patches/gcolor3-update-libportal-usage.patch	\
   %D%/packages/patches/gd-fix-tests-on-i686.patch		\
   %D%/packages/patches/gd-brect-bounds.patch			\
diff --git a/gnu/packages/cross-base.scm b/gnu/packages/cross-base.scm
index 93e4f8a445..9c98c923ff 100644
--- a/gnu/packages/cross-base.scm
+++ b/gnu/packages/cross-base.scm
@@ -242,6 +242,9 @@ (define* (cross-gcc target
         (append
          (origin-patches (package-source xgcc))
          (append (cond
+                  ((version>=? (package-version xgcc) "12.0")
+                   (search-patches "gcc-12-cross-environment-variables.patch"
+                                   "gcc-cross-gxx-include-dir.patch"))
                   ((version>=? (package-version xgcc) "10.0")
                    (search-patches "gcc-10-cross-environment-variables.patch"
                                    "gcc-cross-gxx-include-dir.patch"))
diff --git a/gnu/packages/patches/gcc-12-cross-environment-variables.patch b/gnu/packages/patches/gcc-12-cross-environment-variables.patch
new file mode 100644
index 0000000000..8787f094c0
--- /dev/null
+++ b/gnu/packages/patches/gcc-12-cross-environment-variables.patch
@@ -0,0 +1,54 @@
+Search path environment variables for cross-compilers.  See the discussion
+at <http://gcc.gnu.org/ml/gcc/2013-02/msg00124.html>.
+
+Note: Touch 'C_INCLUDE_PATH' et al. rather than 'CPATH', as discussed
+at <http://bugs.gnu.org/22186>.
+
+diff --git a/gcc/gcc.cc b/gcc/gcc.cc
+--- a/gcc/gcc.cc
++++ b/gcc/gcc.cc
+@@ -4832,7 +4832,7 @@ process_command (unsigned int decoded_options_count,
+     }
+ 
+   temp = env.get (LIBRARY_PATH_ENV);
+-  if (temp && *cross_compile == '0')
++  if (temp)
+     {
+       const char *startp, *endp;
+       char *nstore = (char *) alloca (strlen (temp) + 3);
+diff --git a/gcc/incpath.cc b/gcc/incpath.cc
+--- a/gcc/incpath.cc
++++ b/gcc/incpath.cc
+@@ -480,8 +480,8 @@ register_include_chains (cpp_reader *pfile, const char *sysroot,
+ 			 int stdinc, int cxx_stdinc, int verbose)
+ {
+   static const char *const lang_env_vars[] =
+-    { "C_INCLUDE_PATH", "CPLUS_INCLUDE_PATH",
+-      "OBJC_INCLUDE_PATH", "OBJCPLUS_INCLUDE_PATH" };
++    { "CROSS_C_INCLUDE_PATH", "CROSS_CPLUS_INCLUDE_PATH",
++      "CROSS_OBJC_INCLUDE_PATH", "CROSS_OBJCPLUS_INCLUDE_PATH" };
+   cpp_options *cpp_opts = cpp_get_options (pfile);
+   size_t idx = (cpp_opts->objc ? 2: 0);
+ 
+@@ -492,7 +492,7 @@ register_include_chains (cpp_reader *pfile, const char *sysroot,
+ 
+   /* CPATH and language-dependent environment variables may add to the
+      include chain.  */
+-  add_env_var_paths ("CPATH", INC_BRACKET);
++  add_env_var_paths ("CROSS_CPATH", INC_BRACKET);
+   add_env_var_paths (lang_env_vars[idx], INC_SYSTEM);
+ 
+   target_c_incpath.extra_pre_includes (sysroot, iprefix, stdinc);
+diff --git a/gcc/system.h b/gcc/system.h
+--- a/gcc/system.h
++++ b/gcc/system.h
+@@ -1317,4 +1317,6 @@ endswith (const char *str, const char *suffix)
+   return memcmp (str + str_len - suffix_len, suffix, suffix_len) == 0;
+ }
+ 
++#define LIBRARY_PATH_ENV "CROSS_LIBRARY_PATH"
++
+ #endif /* ! GCC_SYSTEM_H */
+-- 
+2.36.1
+
-- 
2.36.1

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