[Debian-ha-maintainers] Bug#1150398: gfs2-utils: FTBFS on arm64: unknown type name '__u128'

[Viktor Pashaiev]

Package: gfs2-utils
Version: 3.6.1-2
Severity: important
Tags: patch ftbfs
User: ubuntu-devel at lists.ubuntu.com
Usertags: origin-ubuntu stonking

Dear Maintainer,

gfs2-utils fails to build from source on arm64:

/usr/include/aarch64-linux-gnu/asm/sigcontext.h:81:9: error: unknown type name '__u128'; did you mean '__u32'?

Root cause:
gfs2-utils provides an internal compatibility header gfs2/include/linux/types.h which is exposed via -I compiler flags.
When source files in gfs2/edit (extended.c, journal.c, hexedit.c) include <signal.h>, glibc's <bits/sigcontext.h> includes the kernel UAPI header <asm/sigcontext.h>, which in turn includes <linux/types.h>.
Due to the include path order, the compiler includes the internal gfs2/include/linux/types.h instead of system /usr/include/linux/types.h.
The internal header only defines endian types (__le16 through __be64) and lacks the 128-bit kernel integer types (__s128 and __u128) used by arm64's struct fpsimd_context.

Fix:
Define __s128 and __u128 under #ifdef __SIZEOF_INT128__ in gfs2/include/linux/types.h.
Patch is attached below.

--- a/gfs2/include/linux/types.h
+++ b/gfs2/include/linux/types.h
@@ -24,4 +24,9 @@
 typedef uint64_t __bitwise __le64;
 typedef uint64_t __bitwise __be64;
 
+#ifdef __SIZEOF_INT128__
+typedef __signed__ __int128 __s128 __attribute__((aligned(16)));
+typedef unsigned __int128 __u128 __attribute__((aligned(16)));
+#endif
+
 #endif /* LINUX_TYPES_H */
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