[glibc] hurd: Make error_t an int in C++

[Samuel Thibault <sthibaul@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e3ae80adbc626c4073a082e0205fdbb83033018a

commit e3ae80adbc626c4073a082e0205fdbb83033018a
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Tue Aug 8 16:03:24 2023 +0200

    hurd: Make error_t an int in C++
    
    Making error_t defined to enum __error_t_codes conveniently makes the
    debugger print symbolic values, but in C++ int is not interoperable with
    enum __error_t_codes, leading to C++ application build issues, so let's
    revert error_t to int in C++.

Diff:
---
 sysdeps/mach/hurd/bits/types/error_t.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sysdeps/mach/hurd/bits/types/error_t.h b/sysdeps/mach/hurd/bits/types/error_t.h
index 380aa434d5..4a7bd452c8 100644
--- a/sysdeps/mach/hurd/bits/types/error_t.h
+++ b/sysdeps/mach/hurd/bits/types/error_t.h
@@ -24,6 +24,12 @@
 #ifndef __error_t_defined
 # define __error_t_defined 1
 
+#ifdef __cplusplus
+/* Unfortunately, in C++ int and enum __error_t_codes are not
+   interoperable...  */
+typedef int error_t;
+#else
 typedef enum __error_t_codes error_t;
+#endif
 
 #endif