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<p>At [1] , I read Xcode 12 has a new "feature":<br>
<i><br>
</i><i><b>Clang</b> now reports an error when you use a function
without an explicit declaration when <font color="#0000ff">building
C</font> or Objective-C code for macOS
(-Werror=implicit-function-declaration flag is on). This
additional error detection unifies Clang’s behavior for iOS/tvOS
and macOS 64-bit targets for this diagnostic. (49917738)</i><br>
<i><br>
</i><i><a class="moz-txt-link-freetext" href="https://developer.apple.com/documentation/xcode-release-notes/xcode-12-release-notes">https://developer.apple.com/documentation/xcode-release-notes/xcode-12-release-notes</a></i></p>
<p>At [2], I read that gcc might default to clang with homebrew. If
that is the case, have you tried change it to use gcc [3]?<br>
</p>
<p>If that does not resolve the issue, I'm not a Mac user such that
I unfortunately cannot be of much help with that. Perhaps, there
is a Mac user in the list that will respond if they have solution
for that error.</p>
[1] <a class="moz-txt-link-freetext" href="https://github.com/astropy/astropy/issues/10770">https://github.com/astropy/astropy/issues/10770</a><br>
[2] <a class="moz-txt-link-freetext" href="https://github.com/openvenues/libpostal/issues/511">https://github.com/openvenues/libpostal/issues/511</a><br>
[3]
<a class="moz-txt-link-freetext" href="https://apple.stackexchange.com/questions/245891/installed-gcc-with-homebrew-now-how-to-use-that-gcc-instead-of-clang">https://apple.stackexchange.com/questions/245891/installed-gcc-with-homebrew-now-how-to-use-that-gcc-instead-of-clang</a><br>
<br>
<div class="moz-cite-prefix">On 8/16/2021 11:02 AM, Vo, Trinh T (US
398K) wrote:<br>
</div>
<blockquote type="cite"
cite="mid:571D0262-E5EA-4E42-8418-04AFDF97A4A4@jpl.nasa.gov">
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<p class="MsoNormal"><span style="font-size:14.0pt">Dear
Developer,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">I compiled
from source code of xcrysden on my new laptop, and I
encountered the following errors:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"># <font
color="#0000ff">Compiling XCRYSDEN C-code</font> #<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">#
#<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">#------------------------------#<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">cd C;
/Applications/Xcode.app/Contents/Developer/usr/bin/make
"TOPDIR=/Users/trinhvo/xcrysden-1.6.2" compile<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">make
TOPDIR=/Users/trinhvo/xcrysden-1.6.2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">gcc
-ffast-math -funroll-loops -fPIC -pedantic -Wall
-I/usr/include/tcl8.6
-I/usr/local/Cellar/tcl-tk/8.6.11_1/include
-I/usr/local/Cellar/tcl-tk/8.6.11_1/include -c
xcAppInit.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">xcAppInit.c:407:3:
<b><span style="color:red">error</span></b>: implicit
declaration of function 'XGetErrorText' is<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">
invalid in C99 [-Werror,-Wimplicit-function-declaration]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">
XGetErrorText(display,event->error_code,buffer,sizeof(buffer)-1);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"> ^<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">xcAppInit.c:1834:7:
warning: 'glDrawBuffer' is deprecated: first deprecated in<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"> macOS
10.14 - OpenGL API deprecated. (Define
GL_SILENCE_DEPRECATION to<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">
silence these warnings) [-Wdeprecated-declarations]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">
glDrawBuffer(GL_BACK);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">I do not
know how to fix this error. I have installed all the
required libs using homebrew<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"> -
Tcl/Tk<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"> -
mesa and mesa-glu<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"> -
FFTW3<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">For these
libs, I download from web)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"> -
BWidget <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"> -
Togl (2.0 or later).
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">I appreciate
if you could help me to fix this error.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Thank you
very much,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Trinh</span></p>
</div>
</blockquote>
<blockquote type="cite"
cite="mid:571D0262-E5EA-4E42-8418-04AFDF97A4A4@jpl.nasa.gov">
</blockquote>
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