Hi,
We recently received some bug reports that executables compiled with
mingw-w64 couldn't be executed on Windows XP environments. Users
would get fatal error messages which indicate that the symbol strnlen
couldn't be found in msvcrt.dll (which is correct for Windows XP).
I've verified this with Dependency Walker and some binaries
indeed were under the assumption that strnlen is part of msvcrt.dll.
This is odd as the mingw-w64 crt contains a wrapper implementation
for strnlen (in order to fix these Windows XP compatibility issues). So
I investigated further and found out that strnlen is still being
referenced in the msvcrt.def files.
As other wrapped symbols are also commented out in msvcrt.def I got the
impression that wrapped symbols should be removed from msvcrt.def. I did
this for strnlen in my local test environment and it indeed caused the
strnlen in msvcrt.dll dependency to disappear from compiled binaries.
Is this patch the correct solution to fixing this issue or do you think
the real cause is somewhere else?
Regards,
Erik van Pienbroek
>From a289e2cf5e9f158b861612ceb047a35a2b523c98 Mon Sep 17 00:00:00 2001
From: Erik van Pienbroek <epien...@fedoraproject.org>
Date: Thu, 18 Jul 2013 21:35:11 +0200
Subject: [PATCH] Remove reference to strnlen from msvcrt.def
The symbol strnlen is missing from msvcrt.dll in Windows XP.
Therefore a wrapper function was added to the crt in r3513 to
fix compatibility with Windows XP, but the msvcrt.def file
wasn't updated to reflect this. Therefore compiled binaries
could still be under the assumption that the strnlen always
is part of msvcrt.dll and cause runtime problems on Windows XP
---
mingw-w64-crt/lib32/msvcrt.def.in | 2 +-
mingw-w64-crt/lib64/msvcrt.def.in | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/mingw-w64-crt/lib32/msvcrt.def.in b/mingw-w64-crt/lib32/msvcrt.def.in
index ad8ec29..3fb17eb 100644
--- a/mingw-w64-crt/lib32/msvcrt.def.in
+++ b/mingw-w64-crt/lib32/msvcrt.def.in
@@ -1205,7 +1205,7 @@ strcpy_s
strerror_s
strncat_s
strncpy_s
-strnlen DATA ; msvcrt in XP and lower doesn't have this
+; strnlen replaced by emu
strtok_s
swprintf_s
swscanf_s
diff --git a/mingw-w64-crt/lib64/msvcrt.def.in b/mingw-w64-crt/lib64/msvcrt.def.in
index 14f6083..ed81eff 100644
--- a/mingw-w64-crt/lib64/msvcrt.def.in
+++ b/mingw-w64-crt/lib64/msvcrt.def.in
@@ -1198,7 +1198,7 @@ strncat_s
strncmp
strncpy
strncpy_s
-strnlen DATA ; msvcrt in XP and lower doesn't have this
+; strnlen replaced by emu
strpbrk
strrchr
strspn
--
1.8.3.1
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