https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=fc352c07ad4b4f51ae57a9797259cef0c5c015cc

commit fc352c07ad4b4f51ae57a9797259cef0c5c015cc
Author: Corinna Vinschen <[email protected]>
Date:   Tue Sep 1 12:46:12 2020 +0200

    Cygwin: mtx_init: drop glibc workaround
    
    GLibc will change this code in the forseeable future to align more
    with FreeBSD, so this hack is not actually desired.
    
    Signed-off-by: Corinna Vinschen <[email protected]>

Diff:
---
 winsup/cygwin/libc/mtx.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/winsup/cygwin/libc/mtx.c b/winsup/cygwin/libc/mtx.c
index dca0849cc..f009d19ed 100644
--- a/winsup/cygwin/libc/mtx.c
+++ b/winsup/cygwin/libc/mtx.c
@@ -54,13 +54,6 @@ mtx_init(mtx_t *mtx, int type)
        case mtx_timed:
                mt = PTHREAD_MUTEX_NORMAL;
                break;
-#ifdef __CYGWIN__
-       /* This is a hack to support apps running under GLibc.  mtx_plain is
-          defined as 0 in GLibc, so apps calling mtx_init with just the
-          mtx_recursive flag don't fail, as they should.  Rather they run
-          as if mtx_plain | mtx_recursive has been given as type. */
-       case mtx_recursive:
-#endif
        case mtx_plain | mtx_recursive:
        case mtx_timed | mtx_recursive:
                mt = PTHREAD_MUTEX_RECURSIVE;

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