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package/samba4: fix build on uclibc with GCC 14+

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iconv types are defined differently in glibc (as pointers) and uclibc
(as integers). With changes in GCC14, -Wint-conversion has now become
an error, which shed some light on the issue.

The actual fix for that problem is released in uclibc 1.0.58 [1].
However, because these type definitions are in toolchain headers,
this means that the toolchain used to build samba must also include
uclibc>=1.0.58 (either an external toolchain that includes the uclibc fix,
or a Buildroot toolchain after the uclibc fix is merged in Buildroot [2]).

Until then, provide a workaround for samba itself.

No autobuilder failure on this (yet). It can be reproduced with
    > ./utils/test-pkg -p samba4 -T bootlin-armv5-uclibc

[1] 328e14e55f
[2] https://lore.kernel.org/buildroot/ahPrm_0gVDGw5B5-@waldemar-brodkorb.de/

Assisted-by: Claude:claude-opus-4.8
Signed-off-by: Titouan Christophe <titouan.christophe@mind.be>
Signed-off-by: Marcus Hoffmann <buildroot@bubu1.eu>
(cherry picked from commit e136494e91)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>
This commit is contained in:
Titouan Christophe
2026-05-31 00:50:29 +02:00
committed by Thomas Perale
parent 2cb350c2b4
commit bf23f3aa83
1 changed files with 98 additions and 0 deletions
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98
package/samba4/0002-lib-util-charset-iconv-fix-build-when-iconv_t-is-not.patch Normal file
View File

@@ -0,0 +1,98 @@
From aab0668cc358e443b243528939947c3eea93ca27 Mon Sep 17 00:00:00 2001
From: Titouan Christophe <titouan.christophe@mind.be>
Date: Sat, 30 May 2026 00:30:00 +0200
Subject: [PATCH] charset: fix iconv_t int/pointer conversion on uClibc
The iconv handles cd_pull, cd_push and cd_direct are stored as 'void *'
in struct smb_iconv_s, but iconv_open() returns and iconv()/iconv_close()
take an iconv_t. On glibc this is harmless because iconv_t is itself a
'void *', so the implicit conversions are between identical types.
On uClibc however iconv_t is a 'long int', so storing iconv_open()'s
result into a 'void *' field (and passing those fields back to iconv()
and iconv_close()) is an implicit integer<->pointer conversion. Since
GCC 14 -Wint-conversion is an error by default, this breaks the build:
iconv.c: In function 'sys_iconv':
iconv.c:166:38: error: passing argument 1 of 'iconv' makes integer
from pointer without a cast [-Wint-conversion]
iconv.c: In function 'smb_iconv_open_ex':
iconv.c:403:30: error: assignment to 'void *' from 'iconv_t'
{aka 'long int'} makes pointer from integer without a cast
[-Wint-conversion]
Add explicit casts between iconv_t and void * so the conversions are
intentional and the code builds on both glibc and uClibc.
Upstream: not applicable to samba, because uclibc has already released
a fix, but this isn't included yet in Buildroot prebuilt toolchains.
The problem is therefore to be patched in Buildroot itself.
Signed-off-by: Titouan Christophe <titouan.christophe@mind.be>
---
lib/util/charset/iconv.c | 30 +++++++++++++++---------------
1 file changed, 15 insertions(+), 15 deletions(-)
diff --git a/lib/util/charset/iconv.c b/lib/util/charset/iconv.c
index 074794a26e3..90389d6a954 100644
--- a/lib/util/charset/iconv.c
+++ b/lib/util/charset/iconv.c
@@ -163,7 +163,7 @@ static size_t sys_iconv(void *cd,
size_t ret = iconv((iconv_t)cd,
discard_const_p(char *, inbuf), inbytesleft,
outbuf, outbytesleft);
- if (ret == (size_t)-1) iconv(cd, NULL, NULL, NULL, NULL);
+ if (ret == (size_t)-1) iconv((iconv_t)cd, NULL, NULL, NULL, NULL);
return ret;
}
#endif
@@ -345,12 +345,12 @@ static int smb_iconv_t_destructor(smb_iconv_t hwd)
}
#endif
#ifdef HAVE_NATIVE_ICONV
- if (hwd->cd_pull != NULL && hwd->cd_pull != (iconv_t)-1)
- iconv_close(hwd->cd_pull);
- if (hwd->cd_push != NULL && hwd->cd_push != (iconv_t)-1)
- iconv_close(hwd->cd_push);
- if (hwd->cd_direct != NULL && hwd->cd_direct != (iconv_t)-1)
- iconv_close(hwd->cd_direct);
+ if (hwd->cd_pull != NULL && hwd->cd_pull != (void *)(iconv_t)-1)
+ iconv_close((iconv_t)hwd->cd_pull);
+ if (hwd->cd_push != NULL && hwd->cd_push != (void *)(iconv_t)-1)
+ iconv_close((iconv_t)hwd->cd_push);
+ if (hwd->cd_direct != NULL && hwd->cd_direct != (void *)(iconv_t)-1)
+ iconv_close((iconv_t)hwd->cd_direct);
#endif
return 0;
@@ -400,19 +400,19 @@ _PUBLIC_ smb_iconv_t smb_iconv_open_ex(TALLOC_CTX *mem_ctx, const char *tocode,
* conversions */
if (from == NULL) {
- ret->cd_pull = iconv_open("UTF-16LE", fromcode);
- if (ret->cd_pull == (iconv_t)-1)
- ret->cd_pull = iconv_open("UCS-2LE", fromcode);
- if (ret->cd_pull != (iconv_t)-1) {
+ ret->cd_pull = (void *)iconv_open("UTF-16LE", fromcode);
+ if (ret->cd_pull == (void *)(iconv_t)-1)
+ ret->cd_pull = (void *)iconv_open("UCS-2LE", fromcode);
+ if (ret->cd_pull != (void *)(iconv_t)-1) {
ret->pull = sys_iconv;
}
}
if (to == NULL) {
- ret->cd_push = iconv_open(tocode, "UTF-16LE");
- if (ret->cd_push == (iconv_t)-1)
- ret->cd_push = iconv_open(tocode, "UCS-2LE");
- if (ret->cd_push != (iconv_t)-1) {
+ ret->cd_push = (void *)iconv_open(tocode, "UTF-16LE");
+ if (ret->cd_push == (void *)(iconv_t)-1)
+ ret->cd_push = (void *)iconv_open(tocode, "UCS-2LE");
+ if (ret->cd_push != (void *)(iconv_t)-1) {
ret->push = sys_iconv;
}
}
--
2.54.0