• d-bugmail puremagic.com (47/47) Sep 23 2022 https://issues.dlang.org/show_bug.cgi?id=23363

d-bugmail puremagic.com writes:

https://issues.dlang.org/show_bug.cgi?id=23363

          Issue ID: 23363
           Summary: ImportC: Enums contain wrong members
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Keywords: ImportC
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: kipthemudkip yahoo.com

It appears enum types from ImportC modules don't pick up members from the
actual type, but take them from global #defines who knows where. To see what I
mean, create a similar setup:


//git2.c
#include <git2.h>


//test.d
import git2;

alias DumpModuleEnums(alias someModule) = () {
  static foreach (memberName; __traits(allMembers, someModule)) {{
    alias member = __traits(getMember, git2, memberName);
    static if (is(member == enum)) {
      pragma(msg, memberName);
      static foreach (enumMemberName; __traits(allMembers, member)) {
        pragma(msg, "    ", enumMemberName);
      }
    }
  }}
};

alias dumpGit2 = DumpModuleEnums!git2;


On my x64 Linux Mint machine, many of the enums look like:


git_status_opt_t
    P_ALL
    P_PID
    P_PGID


What are these mysterious members? They seem to be taken from
/usr/include/linux/wait.h:


/* First argument to waitid: */
#define P_ALL           0
#define P_PID           1
#define P_PGID          2
#define P_PIDFD         3


Very bizarre!!

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