bmon @4.0: error: use of undeclared identifier 'unused'

[raramayo (Rodolfo Aramayo)]

Hardware: Apple M4-Max OS: Sequoia 15.4.1 MacPorts base version 2.10.7

--->  Computing dependencies for bmon
--->  Fetching archive for bmon
--->  Attempting to fetch bmon-4.0_3.darwin_24.arm64.tbz2 from https://packages.macports.org/bmon
--->  Attempting to fetch bmon-4.0_3.darwin_24.arm64.tbz2 from https://ywg.ca.packages.macports.org/mirror/macports/packages/bmon
--->  Attempting to fetch bmon-4.0_3.darwin_24.arm64.tbz2 from https://bos.us.packages.macports.org/bmon
--->  Fetching distfiles for bmon
--->  Attempting to fetch bmon-4.0.tar.gz from https://distfiles.macports.org/bmon
--->  Verifying checksums for bmon
--->  Extracting bmon
--->  Configuring bmon
--->  Building bmon                                      
Error: Failed to build bmon: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_net_bmon/bmon/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.
Error: Processing of port bmon failed

[raramayo (Rodolfo Aramayo)]

log_file

[ryandesign (Ryan Carsten Schmidt)]

The error I see in the log is:

In file included from utils.c:31:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/clock.h:13:
/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/mig_errors.h:113:34: error: use of undeclared identifier 'unused'
  113 | __NDR_convert__mig_reply_error_t(__unused mig_reply_error_t *x)
      |                                  ^
/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/sys/cdefs.h:172:40: note: expanded from macro '__unused'
  172 | #define __unused        __attribute__((__unused__))
      |                                        ^
../include/bmon/bmon.h:63:36: note: expanded from macro '__unused__'
   63 | #define __unused__ __attribute__ ((unused))
      |                                    ^

So, bmon has defined something (__unused__) that interfered with the system headers.

No user software is allowed to define identifiers whose names containing double underscores. Those names are reserved for use by the implementation (meaning: the compiler and system headers).

This is a bmon bug, already reported to them here: ​https://github.com/tgraf/bmon/issues/89

Duplicate of #62820.