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<a href="https://gitlab.com/fernando.xps">Fernando Martinez</a> created an issue <a href="https://gitlab.com/gnutls/libtasn1/-/issues/28">#28</a>:
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<a id="user-content-description-of-problem" class="anchor" href="#description-of-problem" aria-hidden="true"></a>Description of problem:</h2>
<p dir="auto">I am trying to cross compile libtasn1 4.16 to armv7 iOS, but i am getting a linker error that i can't solve</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">Undefined symbols for architecture armv7:</span>
<span id="LC2" class="line" lang="plaintext"> "_c_isdigit", referenced from:</span>
<span id="LC3" class="line" lang="plaintext"> __asn1_expand_object_id in libtasn1.a(parser_aux.o)</span>
<span id="LC4" class="line" lang="plaintext"> __asn1_check_identifier in libtasn1.a(parser_aux.o)</span></code></pre>
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<a id="user-content-version-of-libtasn1-used" class="anchor" href="#version-of-libtasn1-used" aria-hidden="true"></a>Version of libtasn1 used:</h2>
<p dir="auto">4.16</p>
<p dir="auto"><a href="https://ftp.gnu.org/gnu/libtasn1/libtasn1-4.16.0.tar.gz" rel="nofollow noreferrer noopener" target="_blank">https://ftp.gnu.org/gnu/libtasn1/libtasn1-4.16.0.tar.gz</a></p>
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<a id="user-content-distributor-of-libtasn1-eg-ubuntu-fedora-rhel" class="anchor" href="#distributor-of-libtasn1-eg-ubuntu-fedora-rhel" aria-hidden="true"></a>Distributor of libtasn1 (e.g., Ubuntu, Fedora, RHEL)</h2>
<p dir="auto">I am compiling the source code itself</p>
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<a id="user-content-how-reproducible" class="anchor" href="#how-reproducible" aria-hidden="true"></a>How reproducible:</h2>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">export SDKPATH=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk</span>
<span id="LC2" class="line" lang="plaintext">export MIN_IOS_VERSION=10.0</span>
<span id="LC3" class="line" lang="plaintext">export HOST=arm-apple-darwin</span>
<span id="LC4" class="line" lang="plaintext">export BUILD=armv7</span>
<span id="LC5" class="line" lang="plaintext">export LDFLAGS_NATIVE="-isysroot $SDKPATH "</span>
<span id="LC6" class="line" lang="plaintext">export ARCHES=armv7</span>
<span id="LC7" class="line" lang="plaintext"></span>
<span id="LC8" class="line" lang="plaintext">export LDFLAGS=$LDFLAGS_NATIVE</span>
<span id="LC9" class="line" lang="plaintext">export CFLAGS="-arch $ARCH $LDFLAGS -miphoneos-version-min=$MIN_IOS_VERSION -fembed-bitcode -Wno-sign-compare "</span>
<span id="LC10" class="line" lang="plaintext">./configure --host=$HOST --build=$BUILD --enable-static --disable-shared --prefix=$PWD/build/$ARCH && make && make install</span></code></pre>
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<a id="user-content-actual-results" class="anchor" href="#actual-results" aria-hidden="true"></a>Actual results:</h2>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">/Applications/Xcode.app/Contents/Developer/usr/bin/make all-recursive</span>
<span id="LC2" class="line" lang="plaintext">Making all in lib</span>
<span id="LC3" class="line" lang="plaintext">Making all in gl</span>
<span id="LC4" class="line" lang="plaintext">/Applications/Xcode.app/Contents/Developer/usr/bin/make all-recursive</span>
<span id="LC5" class="line" lang="plaintext">make[5]: Nothing to be done for `all-am'.</span>
<span id="LC6" class="line" lang="plaintext"> CC coding.lo</span>
<span id="LC7" class="line" lang="plaintext"> CC decoding.lo</span>
<span id="LC8" class="line" lang="plaintext"> CC element.lo</span>
<span id="LC9" class="line" lang="plaintext"> CC errors.lo</span>
<span id="LC10" class="line" lang="plaintext"> CC gstr.lo</span>
<span id="LC11" class="line" lang="plaintext"> CC parser_aux.lo</span>
<span id="LC12" class="line" lang="plaintext"> CC structure.lo</span>
<span id="LC13" class="line" lang="plaintext"> CC version.lo</span>
<span id="LC14" class="line" lang="plaintext"> CCLD libtasn1.la</span>
<span id="LC15" class="line" lang="plaintext">Making all in src</span>
<span id="LC16" class="line" lang="plaintext"> CC asn1Parser.o</span>
<span id="LC17" class="line" lang="plaintext"> CCLD asn1Parser</span>
<span id="LC18" class="line" lang="plaintext">Undefined symbols for architecture armv7:</span>
<span id="LC19" class="line" lang="plaintext"> "_c_isdigit", referenced from:</span>
<span id="LC20" class="line" lang="plaintext"> __asn1_expand_object_id in libtasn1.a(parser_aux.o)</span>
<span id="LC21" class="line" lang="plaintext"> __asn1_check_identifier in libtasn1.a(parser_aux.o)</span>
<span id="LC22" class="line" lang="plaintext">ld: symbol(s) not found for architecture armv7</span>
<span id="LC23" class="line" lang="plaintext">clang: error: linker command failed with exit code 1 (use -v to see invocation)</span>
<span id="LC24" class="line" lang="plaintext">make[2]: *** [asn1Parser] Error 1</span>
<span id="LC25" class="line" lang="plaintext">make[1]: *** [all-recursive] Error 1</span>
<span id="LC26" class="line" lang="plaintext">make: *** [all] Error 2</span></code></pre>
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<a id="user-content-expected-results" class="anchor" href="#expected-results" aria-hidden="true"></a>Expected results:</h2>
<p dir="auto">I see the lib now has a custom c-ctype implementation and it should be included for cross compilation</p>
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