[PATCH] PR libstdc++/60555 std::system_category() should recognise POSIX errno values

[David Edelsohn]

Jonathan

This patch broke AIX bootstrap.

/nasfarm/edelsohn/src/src/libstdc++-v3/src/c++11/system_error.cc: In
member function 'virtual std::error_condition
{anonymous}::system_error_category::default_error_condition(int)
const':
/nasfarm/edelsohn/src/src/libstdc++-v3/src/c++11/system_error.cc:245:7:
error: duplicate case value
       case ENOTEMPTY:
       ^~~~
/nasfarm/edelsohn/src/src/libstdc++-v3/src/c++11/system_error.cc:136:7:
note: previously used here
       case EEXIST:
       ^~~~

AIX errno.h

/*
 * AIX returns EEXIST where 4.3BSD used ENOTEMPTY;
 * but, the standards insist on unique errno values for each errno.
 * A unique value is reserved for users that want to code case
 * statements for systems that return either EEXIST or ENOTEMPTY.
 */
#if defined(_ALL_SOURCE) && !defined(_LINUX_SOURCE_COMPAT)
#define ENOTEMPTY       EEXIST  /* Directory not empty */
#else   /* not _ALL_SOURCE */
#define ENOTEMPTY       87
#endif  /* _ALL_SOURCE */

I will add _LINUX_SOURCE_COMPAT and see how bootstrap proceeds. If it
works, it also will be required in the backport.

Thanks, David