Prior to macOS SDK 15, there were include guards in $SDK_ROOT/usr/include/xlocale/_regex.h:
#ifndef _REGEX_H_ #include <_regex.h> #endif // _REGEX_H_ #include <_xlocale.h> In macOS SDK 15, these include guards are gone: #include <_regex.h> #include <_xlocale.h> Because _REGEX_H_ was defined locally in PostgreSQL's version of src/include/regex/regex.h, these include guards prevented duplicate definitions from $SDK_ROOT/usr/include/_regex.h (not to be confused with $SDK_ROOT/usr/include/xlocale/_regex.h). As a result, attempting to compile PostgreSQL with macOS SDK 15 fails with "previous definition is here" errors for regoff_t, regex_t, and regmatch_t structures. To fix this build issue, define __REGEX_H_ to prevent macOS from including the header that contain redefinitions of the local regex structures. Discussion: https://www.postgresql.org/message-id/CAMBWrQ%3DF9SSPfsFtCv%3DJT51WGK2VcgLA%2BiiJJOmjN0zbbufOEA%40mail.gmail.com --- src/include/regex/regex.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/src/include/regex/regex.h b/src/include/regex/regex.h index d08113724f..045ac626cc 100644 --- a/src/include/regex/regex.h +++ b/src/include/regex/regex.h @@ -32,6 +32,20 @@ * src/include/regex/regex.h */ +#if defined(__darwin__) +/* + * mmacOS SDK 15.0 removed the _REGEX_H_ include guards in + * $SDK_ROOT/usr/include/xlocale/_regex.h, so now + * $SDK_ROOT/usr/include/_regex.h is always included. That file defines + * the same types as below. To guard against type redefinition errors, + * define __REGEX_H_. + */ +#ifndef __REGEX_H_ +#define __REGEX_H_ + +#endif /* __REGEX_H_ */ +#endif + /* * Add your own defines, if needed, here. */ -- 2.45.0
