The warning is:
test2.tex: destination with the same identifier (name{page.A}) has been already used, duplicate ignored
If I follow the \hypersetup{pageanchor=false} & \hypersetup{pageanchor=true}, from the question pdfTeX warning (ext4): destination with the same identifier (nam e{page.1}) has been already used, duplicate ignored it does fix the warning. But what the implications of doing that? Is there an alternative which does not change/disable the page anchors?
I tried adding \pagenumbering{Alph} as the other answer suggested:
One way to avoid the problem is to change the (invisible) numbering style of the title page
But it does not fixed the warning. This is a simple document I could get which does the warning.
\documentclass[10pt,openright,twoside,a5paper]{abntex2}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
% Memoir class conflict with datetime
% https://tex.stackexchange.com/questions/162353/memoir-class-conflict-with-datetime
% https://tex.stackexchange.com/questions/49071/difference-between-let-foo
\let\ordinal\relax
\usepackage{datetime}
% Comment this, unless you are debugging pages' badness Underfull & Overflow
% https://tex.stackexchange.com/questions/115908/geometry-showframe-landscape
\usepackage[showframe]{geometry}
% Package hyperref Warning: Token not allowed in a PDF string?
% https://tex.stackexchange.com/questions/384885/package-hyperref-warning-token
\pdfstringdefDisableCommands{\let\uppercase\relax}
\titulo{Modelo Canônico de TCC, Monografia, ... de Pós--Doutorado com \abnTeX}
\autor{Nome do Autor}\local{Pais}\data{\today}
\orientador{Prof. Dr. Nome do Orientador}
\coorientador{Prof. Dr. Nome do Coorientador}
\instituicao{Departamento de Engenharia Elétrica e Eletrônica -- EEL
\par
Programa de Pós--Graduação em Engenharia Elétrica -- PGEEL}
\begin{document}
\pretextual
\imprimircapa
\imprimirfolhaderosto*
Without some text after that imprimirfolhaderosto*, the next command ignored somehow
\end{document}
Update
Systems versions after I added \listfiles to my preamble (Which package version am I using?):
$ pdftex --version
MiKTeX-pdfTeX (MiKTeX 2.9.6300)
using bzip2 version 1.0.6, 6-Sept-2010
compiled with curl version 7.53.1; using libcurl/7.53.1 WinSSL
compiled with expat version 2.2; using expat_2.2.0
compiled with jpeg version 9.2
compiled with liblzma version 50020032; using 50020032
compiled with libpng version 1.6.29; using 1.6.29
compiled with libressl version LibreSSL 2.4.5; using LibreSSL 2.4.5
compiled with MiKTeX Application Framework version 1.6300; using 1.6300
compiled with MiKTeX Core version 1.6300; using 1.6300
compiled with MiKTeX Archive Extractor version 1.6300; using 1.6300
compiled with MiKTeX Package Manager version 1.6300; using 1.6300
compiled with poppler version 0.53.0
compiled with uriparser version 0.8.4
compiled with zlib version 1.2.11; using 1.2.11
This is pdfTeX, Version 3.14159265-2.6-1.40.18 (MiKTeX 2.9.6300) (preloaded format=pdflatex 2017.4.21) 14 AUG 2017 22:16
entering extended mode
**./test2.tex
(test2.tex
LaTeX2e <2017-04-15>
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<to be read again>
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l.30 W
ithout some text after that imprimirfolhaderosto*, the next command ig...
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memoir.cls 2016/05/16 v3.7f configurable book, report, article document cl
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ifpdf.sty 2017/03/15 v3.2 Provides the ifpdf switch
ifetex.sty 2011/12/15 v1.2 ifetex
ifxetex.sty 2010/09/12 v0.6 Provides ifxetex conditional
ifluatex.sty 2016/05/16 v1.4 Provides the ifluatex switch (HO)
mem10.clo 2008/01/30 v0.3 memoir class 10pt size option
mempatch.sty 2009/07/24 v6.0f Patches for memoir class v1.6180339
textcase.sty 2004/10/07 v0.07 Text only upper/lower case changing (DPC)
hyperref.sty 2017/03/14 v6.85a Hypertext links for LaTeX
hobsub-hyperref.sty 2016/05/16 v1.14 Bundle oberdiek, subset hyperref (HO)
hobsub-generic.sty 2016/05/16 v1.14 Bundle oberdiek, subset generic (HO)
hobsub.sty 2016/05/16 v1.14 Construct package bundles (HO)
infwarerr.sty 2016/05/16 v1.4 Providing info/warning/error messages (HO)
ltxcmds.sty 2016/05/16 v1.23 LaTeX kernel commands for general use (HO)
ifvtex.sty 2016/05/16 v1.6 Detect VTeX and its facilities (HO)
intcalc.sty 2016/05/16 v1.2 Expandable calculations with integers (HO)
etexcmds.sty 2016/05/16 v1.6 Avoid name clashes with e-TeX commands (HO)
kvsetkeys.sty 2016/05/16 v1.17 Key value parser (HO)
kvdefinekeys.sty 2016/05/16 v1.4 Define keys (HO)
pdftexcmds.sty 2017/03/19 v0.25 Utility functions of pdfTeX for LuaTeX (HO)
pdfescape.sty 2016/05/16 v1.14 Implements pdfTeX's escape features (HO)
bigintcalc.sty 2016/05/16 v1.4 Expandable calculations on big integers (HO)
bitset.sty 2016/05/16 v1.2 Handle bit-vector datatype (HO)
uniquecounter.sty 2016/05/16 v1.3 Provide unlimited unique counter (HO)
letltxmacro.sty 2016/05/16 v1.5 Let assignment for LaTeX macros (HO)
hopatch.sty 2016/05/16 v1.3 Wrapper for package hooks (HO)
xcolor-patch.sty 2016/05/16 xcolor patch
atveryend.sty 2016/05/16 v1.9 Hooks at the very end of document (HO)
atbegshi.sty 2016/06/09 v1.18 At begin shipout hook (HO)
refcount.sty 2016/05/16 v3.5 Data extraction from label references (HO)
hycolor.sty 2016/05/16 v1.8 Color options for hyperref/bookmark (HO)
keyval.sty 2014/10/28 v1.15 key=value parser (DPC)
auxhook.sty 2016/05/16 v1.4 Hooks for auxiliary files (HO)
kvoptions.sty 2016/05/16 v3.12 Key value format for package options (HO)
pd1enc.def 2017/03/14 v6.85a Hyperref: PDFDocEncoding definition (HO)
hyperref.cfg 2002/06/06 v1.2 hyperref configuration of TeXLive
url.sty 2013/09/16 ver 3.4 Verb mode for urls, etc.
memhfixc.sty 2013/05/30 v1.17 nameref/hyperref package fixes for memoir clas
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hpdftex.def 2017/03/14 v6.85a Hyperref driver for pdfTeX
rerunfilecheck.sty 2016/05/16 v1.8 Rerun checks for auxiliary files (HO)
bookmark.sty 2016/05/17 v1.26 PDF bookmarks (HO)
bkm-pdftex.def 2016/05/17 v1.26 bookmark driver for pdfTeX (HO)
babel.sty 2016/04/23 3.9r The Babel package
bblopts.cfg 2005/09/08 v0.1 add Arabic and Farsi to "declared" options of b
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portuges.ldf 2008/03/18 v1.2q Portuguese support from the babel system
enumitem.sty 2011/09/28 v3.5.2 Customized lists
calc.sty 2014/10/28 v4.3 Infix arithmetic (KKT,FJ)
fontenc.sty
t1enc.def 2017/04/05 v2.0i Standard LaTeX file
inputenc.sty 2015/03/17 v1.2c Input encoding file
utf8.def 2017/01/28 v1.1t UTF-8 support for inputenc
t1enc.dfu 2017/01/28 v1.1t UTF-8 support for inputenc
ot1enc.dfu 2017/01/28 v1.1t UTF-8 support for inputenc
omsenc.dfu 2017/01/28 v1.1t UTF-8 support for inputenc
datetime.sty 2015/03/20 v2.60 Date Time Package
etoolbox.sty 2017/01/02 v2.4 e-TeX tools for LaTeX (JAW)
fmtcount.sty 2015/05/05 v3.01
xkeyval.sty 2014/12/03 v2.7a package option processing (HA)
xkeyval.tex 2014/12/03 v2.7a key=value parser (HA)
fcprefix.sty 2012/09/28
fcnumparser.sty 2012/09/28
amsgen.sty 1999/11/30 v2.0 generic functions
fc-portuges.def 2014/06/09
datetime-defaults.sty 2013/09/10
geometry.sty 2010/09/12 v5.6 Page Geometry
geometry.cfg
nameref.sty 2016/05/21 v2.44 Cross-referencing by name of section
gettitlestring.sty 2016/05/16 v1.5 Cleanup title references (HO)
t1cmss.fd 2014/09/29 v2.5h Standard LaTeX font definitions
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Package atveryend Info: Empty hook `AtEndAfterFileList' on input line 31.
Package atveryend Info: Empty hook `AtVeryVeryEnd' on input line 31.
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Here is how much of TeX's memory you used:
11133 strings out of 493324
160841 string characters out of 3134268
302523 words of memory out of 3000000
14563 multiletter control sequences out of 15000+200000
10381 words of font info for 24 fonts, out of 3000000 for 9000
1141 hyphenation exceptions out of 8191
39i,9n,35p,1000b,457s stack positions out of 5000i,500n,10000p,200000b,50000s
PDF statistics:
48 PDF objects out of 1000 (max. 8388607)
5 named destinations out of 1000 (max. 500000)
9 words of extra memory for PDF output out of 10000 (max. 10000000)
Best Answer
pageanchors are needed for links which point to a page. E.g. from the bookmarks or from the table of contents or from some
\pageref{..}.If two pages have the same number then their pageanchors are the same and so links have no unique destination. This should be avoided.
If there is no link or bookmark that points to one of the problematic pages you can disable the anchors without problems. For a titlepage this is normally the case. So this here works okay in your example:
The main problem with this solution is to get the correct place to reenable the pageanchors, e.g. if hidden empty pages are involved one sometimes has to add some
\clearpageand try out a bit.Changing the pagenumber of one of the problematic doublette is also an option. In this case the main problem is to find the right location where to change the pagenumbering. This can be difficult if a class like yours does a lot through predefined commands. In your case this here works:
In other cases it could be also necessary to insert a
\clearpageor\cleardoublepage.Be aware that this solution also change the page number shown in a pdf viewer: