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<p class="p1"><span class="s1">No problem at all, Perette. Appreciate your suggestion.</span></p>
<p class="p1"><span class="s1"><br>
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<p class="p1"><span class="s1">Sorry, I am new to compliers and must miss something. I have a file which controls the compilation and makefile. Followed is my settings to compile FFmpeg:</span></p>
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<p class="p3"><span class="s1"> conf.env['CXXFLAGS'].append('-fPIC')</span></p>
<p class="p3"><span class="s1"> conf.env['CXXFLAGS'].append('-DPIC')</span></p>
<p class="p3"><span class="s1"> ...</span></p>
<p class="p4"><span style="font-size: 12pt;"> extra_args += ['--enable-libopencore-amrnb',</span><br>
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<p class="p5"><span class="s2"> </span><span class="s1"> '--extra-cflags=%s %s' % (conf.env['CFLAGS'], conf.env['CPPFLAGS']),</span></p>
<p class="p3"><span class="s1"> '--extra-cxxflags=%s %s' % (conf.env['CXXFLAGS'], conf.env['CPPFLAGS']),</span></p>
<p class="p3"><span class="s1"> '--extra-ldflags=%s' % (conf.env['LDFLAGS'],),</span></p>
<p class="p3"><span class="s1"> '--extra-libs=-L /lib64 -lstdc++ -lmylibrarytest',</span></p>
<p class="p3"><span class="s1"> ] </span></p>
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<p><a href="http://aka.ms/weboutlook" id="LPNoLP"></a><br>
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However, I got the following error:
<p class="p1"><span class="s1">.../binutils/2.25/centos6-native/da39a3e/bin/ld: .../mylibrary/0.1/gcc-4.9-glibc-2.20-fb/8fd4fe1/lib/libmylibrary.a(my_file.cpp.o): relocation R_X86_64_32 against `.bss' can not be used when making a shared object; recompile with
-fPIC</span></p>
<p class="p1"><span class="s1">.../mylibrary/0.1/gcc-4.9-glibc-2.20/8fd4fe1/lib/libmylibrary.a: error adding symbols: Bad value</span></p>
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Looks like there is a problem when I compile my library such that there is the above error when compiling FFmpeg?
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<div>Thanks.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>发件人:</b> Libav-user <libav-user-bounces@ffmpeg.org> 代表 Perette Barella <perette@barella.org><br>
<b>发送时间:</b> 2016年9月3日 16:34<br>
<b>收件人:</b> This list is about using libavcodec, libavformat, libavutil, libavdevice and libavfilter.<br>
<b>主题:</b> Re: [Libav-user] 答复: 答复: 答复: Are there any ways to use a lib (built from C++ OpenCV) in Ffmpeg filter?</font>
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<div class="" style="margin-top:0px; margin-bottom:0px">Should it still be the compilation setting issue, when compiling my library or compiling FFmpeg?</div>
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<div>When you do the final link, are you using the C or C++ compiler? You need to use the C++ one.</div>
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<div>So:</div>
<div>1. C++ etc to make the library</div>
<div>2. cc -c your_files.c</div>
<div>3. C++ -llibrary your_files.o</div>
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<div class="">In these errors:</div>
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<span class="s1">.../binutils/2.25/centos6-native/da39a3e/bin/ld: .../mylibrary/0.1/gcc-4.9-glibc-2.20/80414d5/lib/libmylibrary.a(mylibrary_file.cpp.o): undefined reference to symbol '_ZdlPv@@GLIBCXX_3.4'</span></div>
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<span class="s1">.../libgcc/4.9.x/gcc-4.9-glibc-2.20/024dbc3/lib/libstdc++.so: error adding symbols: DSO missing from command line</span></div>
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<div class="">“glibcxx” suggests it’s missing the C++ support library, like if you’re linking with cc instead of c++ compiler.</div>
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<div class="">And sorry about dropping the tar on the list earlier, I thought I was replying off list. My bad.</div>
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<div class="">Perette</div>
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