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* [newlib-cygwin] Cygwin: rename __sFILE to __sFILE64 for backward compatibility
@ 2022-12-08 13:17 Corinna Vinschen
  0 siblings, 0 replies; only message in thread
From: Corinna Vinschen @ 2022-12-08 13:17 UTC (permalink / raw)
  To: cygwin-cvs;h=0f376ae22036bac2fbc7863264909b599e42616c

commit 0f376ae22036bac2fbc7863264909b599e42616c
Author:     Corinna Vinschen <>
AuthorDate: Thu Dec 8 13:58:37 2022 +0100
Commit:     Corinna Vinschen <>
CommitDate: Thu Dec 8 13:58:37 2022 +0100

    Cygwin: rename __sFILE to __sFILE64 for backward compatibility
    Until Cygwin 3.3.6, we define __LARGE64_FILES unconditionally, so we
    were using the type __sFILE64 even for 64 bit.  That was lazy and wrong.
    so commit 2902b3a09e0a ("Cygwin: drop requirement to build newlib's
    stdio64") tried to fix that.
    Unfortunately this patch forgot to take the exposure of the typename
    __sFILE64 in userspace into account.  This leads to trouble in C++ due
    to name mangling.
    Fix this by redefining __sFILE to __sFILE64.  The type name is very much
    internal, so it doesn't really matter, except for the fact that it needs
    to stay backward compatible so as not to break building against C++ libs
    built under older versions of Cygwin.
    Fixes: 2902b3a09e0a ("Cygwin: drop requirement to build newlib's stdio64")
    Signed-off-by: Corinna Vinschen <>

 winsup/cygwin/include/cygwin/config.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/winsup/cygwin/include/cygwin/config.h b/winsup/cygwin/include/cygwin/config.h
index 2a708327890b..c9c3565c63a3 100644
--- a/winsup/cygwin/include/cygwin/config.h
+++ b/winsup/cygwin/include/cygwin/config.h
@@ -49,6 +49,12 @@ extern inline struct _reent *__getreent (void)
 #define __FILENAME_MAX__ 4096	/* Keep in sync with PATH_MAX in limits.h. */
+/* Unfortunately we defined __LARGE64_FILES until Cygwin 3.3.6, so
+   FILE was based on `struct __sFILE64'.  The name is exposed into
+   userspace and consequentially used in C++ name mangling.  We must
+   redefine __sFILE as __sFILE64 to stay backward compatible. */
+#define __sFILE	__sFILE64
 /* The following block of macros is required to build newlib correctly for
    Cygwin.  Changing them in applications has no or not the desired effect.
    Just leave them alone. */

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