Created attachment 13030 [details]
dev-libs/glib-2.66.3 build failure

glibc's bits/stat.h header tricks the configure feature detection in at least dev-libs/glib and app-arch/zstd (see bug 735818).

The issue is

#  define __ST_TIME(X)                         \
       __extension__ union {                   \
           struct timespec st_##X##tim;        \
           struct {                            \
               __time_t st_##X##time;          \
               unsigned long st_##X##timensec; \
           };                                  \
       }

... a neat trick using an anonymous union to provide st_mtimensec, et al.

glib's configuration results look like this on amd64:

Checking if "statx() test" compiles: YES 
Header <locale.h> has symbol "LC_MESSAGES" : YES 
Checking whether type "struct stat" has member "st_mtimensec" : NO 
Checking whether type "struct stat" has member "st_mtim.tv_nsec" : YES 
Checking whether type "struct stat" has member "st_atimensec" : NO 
Checking whether type "struct stat" has member "st_atim.tv_nsec" : YES 
Checking whether type "struct stat" has member "st_ctimensec" : NO 
Checking whether type "struct stat" has member "st_ctim.tv_nsec" : YES 

but like this on alpha:

Checking if "statx() test" compiles: YES 
Header <locale.h> has symbol "LC_MESSAGES" : YES 
Checking whether type "struct stat" has member "st_mtimensec" : YES 
Checking whether type "struct stat" has member "st_mtim.tv_nsec" : YES 
Checking whether type "struct stat" has member "st_atimensec" : YES 
Checking whether type "struct stat" has member "st_atim.tv_nsec" : YES 
Checking whether type "struct stat" has member "st_ctimensec" : YES 
Checking whether type "struct stat" has member "st_ctim.tv_nsec" : YES 

which ultimately causes the build to compile a path that doesn't work. (Attached is the build failure snippet)


See downstream bug reports
https://bugs.gentoo.org/759001
https://bugs.gentoo.org/735818