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@@ -0,0 +1,56 @@
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+From 82becbadd5918ed7ad3c2b651ce479084b5feb2a Mon Sep 17 00:00:00 2001
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+From: Etienne Carriere <etienne.carriere@linaro.org>
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+Date: Mon, 10 May 2021 15:58:41 +0200
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+Subject: core: zlib: fix build warning when _LFS64_LARGEFILE is not defined
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+
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+In zlib, _LFS64_LARGEFILE is expected to be a boolean directive, either
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+1 (true) or 0 (false). Depending on toolchain version and directives
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+build may produces warnings (as shown below with gcc 9.3) when the macro
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+is not defined hence this change to default it to value 0 (false).
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+
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+core/lib/zlib/zutil.h:196:39: warning: "_LFS64_LARGEFILE" is not defined, evaluates to 0 [-Wundef]
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+ 196 | (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
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+ | ^~~~~~~~~~~~~~~~
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+In file included from core/lib/zlib/adler32.c:9:
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+core/lib/zlib/zutil.h:196:39: warning: "_LFS64_LARGEFILE" is not defined, evaluates to 0 [-Wundef]
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+ 196 | (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
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+ | ^~~~~~~~~~~~~~~~
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+ CC out/core/lib/zlib/zutil.o
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+In file included from core/lib/zlib/inftrees.c:7:
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+core/lib/zlib/zutil.h:196:39: warning: "_LFS64_LARGEFILE" is not defined, evaluates to 0 [-Wundef]
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+ 196 | (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
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+ | ^~~~~~~~~~~~~~~~
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+In file included from core/lib/zlib/inflate.c:84:
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+core/lib/zlib/zutil.h:196:39: warning: "_LFS64_LARGEFILE" is not defined, evaluates to 0 [-Wundef]
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+ 196 | (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
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+ | ^~~~~~~~~~~~~~~~
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+In file included from core/lib/zlib/zutil.c:9:
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+core/lib/zlib/zutil.h:196:39: warning: "_LFS64_LARGEFILE" is not defined, evaluates to 0 [-Wundef]
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+ 196 | (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
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+ | ^~~~~~~~~~~~~~~~
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+
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+Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
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+Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
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+---
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+ core/lib/zlib/zconf.h | 5 +++++
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+ 1 file changed, 5 insertions(+)
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+
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+diff --git a/core/lib/zlib/zconf.h b/core/lib/zlib/zconf.h
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+index 0bca18be..a7d13741 100644
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+--- a/core/lib/zlib/zconf.h
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++++ b/core/lib/zlib/zconf.h
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+@@ -487,6 +487,11 @@ typedef uLong FAR uLongf;
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+ # endif
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+ #endif
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+
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++/* Other places expect _LFS64_LARGEFILE to be defined with a valid value */
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++#ifndef _LFS64_LARGEFILE
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++#define _LFS64_LARGEFILE 0
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++#endif
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++
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+ #if defined(_LFS64_LARGEFILE) && _LFS64_LARGEFILE-0
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+ # define Z_LFS64
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+ #endif
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+--
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+2.17.1
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+
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