zeroc-ice: fix build failure of forked mcpp (#475929)

From faa694a7171a06f83034fd869adc4cffa2ae0c18 Mon Sep 17 00:00:00 2001

From: laurensmiers <laurensmiers@protonmail.com>

Date: Wed, 22 Oct 2025 14:50:23 +0200

Subject: [PATCH] fix: mb_init does not accept any parameter

Defined in mbchar.c:114 :

```c

void    mb_init()

/*

 * Initialize multi-byte character settings.

 * First called prior to setting the 'mcpp_mode'.

 * Will be called again each time the multibyte character encoding is changed.

 */

{

```

It does not expect any parameters.

---

 mcpp_main.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mcpp_main.c b/mcpp_main.c

index 54a62b2..44265ad 100644

--- a/mcpp_main.c

+++ b/mcpp_main.c

@@ -302,7 +302,7 @@ int     mcpp_lib_main

     inc_dirp = &null;   /* Initialize to current (null) directory   */

     cur_fname = cur_fullname = "(predefined)";  /* For predefined macros    */

     init_defines();                         /* Predefine macros     */

-    mb_init(TRUE);      /* Should be initialized prior to get options   */

+    mb_init();      /* Should be initialized prior to get options   */

     do_options( argc, argv, &in_file, &out_file);   /* Command line options */

     /* Open input file, "-" means stdin.    */

From bd5ddbde9e4ed24101cdc86007f26e95f38dd5b1 Mon Sep 17 00:00:00 2001

From: laurensmiers <laurensmiers@protonmail.com>

Date: Wed, 22 Oct 2025 14:52:30 +0200

Subject: [PATCH] fix: don't use reserved keyword for goto statement

Rename:

- 'true' to 'exit_success'

- 'false' to 'exit_fail'

Chose not to change the flow of the code by removing the goto's to

avoid regressions.

---

 system.c | 10 +++++-----

 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/system.c b/system.c

index 646caf6..0a15aec 100644

--- a/system.c

+++ b/system.c

@@ -1738,7 +1738,7 @@ static int  open_file(

     if (! fullname)                 /* Non-existent or directory    */

         return  FALSE;

     if (included( fullname))        /* Once included    */

-        goto  true;

+        goto  exit_success;

     if ((max_open != 0 && max_open <= include_nest)

                             /* Exceed the known limit of open files */

@@ -1765,12 +1765,12 @@ static int  open_file(

         if ((fp = mcpp_fopen( fullname, "r")) == NULL) {

             file->fp = mcpp_fopen( cur_fullname, "r");

             fseek( file->fp, file->pos, SEEK_SET);

-            goto  false;

+            goto  exit_fail;

         }

         if (max_open == 0)      /* Remember the limit of the system */

             max_open = include_nest;

     } else if (fp == NULL)                  /* No read permission   */

-        goto  false;

+        goto  exit_fail;

     /* Truncate buffer of the includer to save memory   */

     len = (int) (file->bptr - file->buffer);

     if (len) {

@@ -1802,9 +1802,9 @@ static int  open_file(

     if (mkdep && ((mkdep & MD_SYSHEADER) || ! infile->sys_header))

         put_depend( fullname);          /* Output dependency line   */

-true:

+exit_success:

     return  TRUE;

-false:

+exit_fail:

     free( fullname);

     return  FALSE;

 }

  expat,

  libedit,

  lmdb,

  mcpp,

  openssl,

  libxcrypt,

  python3, # for tests only

}:

let

  zeroc_mcpp = stdenv.mkDerivation rec {

    pname = "zeroc-mcpp";

    version = "2.7.2.14";

  mcpp' = mcpp.overrideAttrs (prevAttrs: rec {

    pname = "mcpp-zeroc-ice";

    version = "2.7.3";

    src = fetchFromGitHub {

      owner = "zeroc-ice";

      repo = "mcpp";

      rev = "v${version}";

      sha256 = "1psryc2ql1cp91xd3f8jz84mdaqvwzkdq2pr96nwn03ds4cd88wh";

      hash = "sha256-hZGU5mqMRTTHV2bR9uzM6ALj1sypjPxO5Ajg8aKzLxc=";

    };

    configureFlags = [ "--enable-mcpplib" ];

    installFlags = [ "PREFIX=$(out)" ];

  };

    # zeroc-ice's fork diverges quite a bit from upstream mcpp, so prevAttrs.patches is not used here

    patches = [

      # See https://github.com/zeroc-ice/mcpp/pull/12

      ./fix-mb_init.patch

      ./fix-reserved-keywords.patch

    ];

    installFlags = prevAttrs.installFlags or [ ] ++ [ "PREFIX=$(out)" ];

  });

in

stdenv.mkDerivation rec {

  pname = "zeroc-ice";

  };

  buildInputs = [

    zeroc_mcpp

    mcpp'

    bzip2

    expat

    libedit