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106 lines
3.6 KiB
XML
106 lines
3.6 KiB
XML
<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xml:id="chap-platform-nodes">
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<title>Platform Notes</title>
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<section xml:id="sec-darwin">
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<title>Darwin (macOS)</title>
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<para>
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Some common issues when packaging software for Darwin:
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</para>
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<itemizedlist>
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<listitem>
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<para>
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The Darwin <literal>stdenv</literal> uses clang instead of gcc. When
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referring to the compiler <varname>$CC</varname> or <command>cc</command>
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will work in both cases. Some builds hardcode gcc/g++ in their build
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scripts, that can usually be fixed with using something like
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<literal>makeFlags = [ "CC=cc" ];</literal> or by patching the build
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scripts.
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</para>
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<programlisting>
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stdenv.mkDerivation {
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name = "libfoo-1.2.3";
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# ...
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buildPhase = ''
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$CC -o hello hello.c
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'';
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}
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</programlisting>
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</listitem>
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<listitem>
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<para>
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On Darwin, libraries are linked using absolute paths, libraries are
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resolved by their <literal>install_name</literal> at link time. Sometimes
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packages won't set this correctly causing the library lookups to fail at
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runtime. This can be fixed by adding extra linker flags or by running
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<command>install_name_tool -id</command> during the
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<function>fixupPhase</function>.
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</para>
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<programlisting>
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stdenv.mkDerivation {
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name = "libfoo-1.2.3";
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# ...
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makeFlags = stdenv.lib.optional stdenv.isDarwin "LDFLAGS=-Wl,-install_name,$(out)/lib/libfoo.dylib";
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}
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</programlisting>
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</listitem>
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<listitem>
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<para>
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Even if the libraries are linked using absolute paths and resolved via
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their <literal>install_name</literal> correctly, tests can sometimes fail
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to run binaries. This happens because the <varname>checkPhase</varname>
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runs before the libraries are installed.
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</para>
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<para>
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This can usually be solved by running the tests after the
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<varname>installPhase</varname> or alternatively by using
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<varname>DYLD_LIBRARY_PATH</varname>. More information about this variable
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can be found in the <citerefentry>
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<refentrytitle>dyld</refentrytitle>
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<manvolnum>1</manvolnum></citerefentry> manpage.
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</para>
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<programlisting>
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dyld: Library not loaded: /nix/store/7hnmbscpayxzxrixrgxvvlifzlxdsdir-jq-1.5-lib/lib/libjq.1.dylib
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Referenced from: /private/tmp/nix-build-jq-1.5.drv-0/jq-1.5/tests/../jq
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Reason: image not found
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./tests/jqtest: line 5: 75779 Abort trap: 6
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</programlisting>
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<programlisting>
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stdenv.mkDerivation {
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name = "libfoo-1.2.3";
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# ...
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doInstallCheck = true;
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installCheckTarget = "check";
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}
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</programlisting>
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</listitem>
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<listitem>
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<para>
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Some packages assume xcode is available and use <command>xcrun</command>
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to resolve build tools like <command>clang</command>, etc. This causes
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errors like <code>xcode-select: error: no developer tools were found at
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'/Applications/Xcode.app'</code> while the build doesn't actually depend
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on xcode.
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</para>
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<programlisting>
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stdenv.mkDerivation {
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name = "libfoo-1.2.3";
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# ...
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prePatch = ''
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substituteInPlace Makefile \
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--replace '/usr/bin/xcrun clang' clang
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'';
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}
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</programlisting>
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<para>
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The package <literal>xcbuild</literal> can be used to build projects that
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really depend on Xcode. However, this replacement is not 100% compatible
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with Xcode and can occasionally cause issues.
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</para>
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</listitem>
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</itemizedlist>
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</section>
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</chapter>
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