[Buildroot] [git commit branch/2025.02.x] package/samba4: fix build on m68k

[Thomas Perale via buildroot <buildroot@buildroot.org>]

commit: https://gitlab.com/buildroot.org/buildroot/-/commit/c336c3c7494fd1bfe33c29172de585a3ab0d4f3e
branch: https://gitlab.com/buildroot.org/buildroot/-/tree/2025.02.x

samba4 uses very big switch statements, which causes the build to fail
on m68k, because the offsets there are only 16-bit.

We fix that by using -mlong-jump-table-offsets on m68k to use 32-bit
offsets for switch statements, but this is only available starting with
gcc 7 [0] [1].

Only one package selects samba4, mpd, but it already depends on gcc
>= 12. As such, we do not need to propagate that new dependency.

Fixes:
https://autobuild.buildroot.net/results/b60/b606da691bb462879d4f9769928b5a40b9170837/

[0] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57583#c15
[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57583#c16

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit 053615b6a769826ff77dd0ccb1bef08a12943fdc)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>
---
 package/samba4/Config.in | 5 +++++
 package/samba4/samba4.mk | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/package/samba4/Config.in b/package/samba4/Config.in
index e1d3dd9bf7..59f040e96a 100644
--- a/package/samba4/Config.in
+++ b/package/samba4/Config.in
@@ -4,6 +4,10 @@ comment "samba4 needs a uClibc or glibc toolchain w/ wchar, dynamic library, NPT
 		|| BR2_STATIC_LIBS || !BR2_TOOLCHAIN_HAS_THREADS_NPTL
 	depends on BR2_USE_MMU
 
+comment "samba4 needs a toolchain w/ gcc >= 7"
+	depends on BR2_m68k
+	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_7
+
 config BR2_PACKAGE_SAMBA4
 	bool "samba4"
 	depends on BR2_USE_MMU # fork()
@@ -12,6 +16,7 @@ config BR2_PACKAGE_SAMBA4
 	depends on !BR2_STATIC_LIBS # cmocka, python, gnutls
 	depends on BR2_TOOLCHAIN_HAS_SYNC_4
 	depends on !BR2_TOOLCHAIN_USES_MUSL
+	depends on !BR2_m68k || BR2_TOOLCHAIN_GCC_AT_LEAST_7 # m68k needs gcc >= 7.x
 	select BR2_PACKAGE_CMOCKA
 	select BR2_PACKAGE_E2FSPROGS
 	select BR2_PACKAGE_GNUTLS
diff --git a/package/samba4/samba4.mk b/package/samba4/samba4.mk
index e96e86b5f3..50ae8ba6af 100644
--- a/package/samba4/samba4.mk
+++ b/package/samba4/samba4.mk
@@ -32,6 +32,11 @@ SAMBA4_CONF_ENV = \
 	XSLTPROC=false \
 	WAF_NO_PREFORK=1
 
+# m68k needs 32-bit offsets in switch tables to build
+ifeq ($(BR2_m68k),y)
+SAMBA4_CFLAGS += -mlong-jump-table-offsets
+endif
+
 SAMBA4_PYTHON = PYTHON="$(HOST_DIR)/bin/python3"
 ifeq ($(BR2_PACKAGE_PYTHON3),y)
 SAMBA4_PYTHON += PYTHON_CONFIG="$(STAGING_DIR)/usr/bin/python3-config"
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