forked from mirrors/nixpkgs
84 lines
2.5 KiB
XML
84 lines
2.5 KiB
XML
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<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>Some common issues when packaging software for darwin:</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.
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When referring to the compiler <varname>$CC</varname> or <command>cc</command>
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will work in both cases. Some builds hardcode gcc/g++ in their
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build scripts, that can usually be fixed with using something
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like <literal>makeFlags = [ "CC=cc" ];</literal> or by patching
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the build scripts.
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</para>
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<programlisting>
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stdenv.mkDerivation {
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name = "libfoo-1.2.3";
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# ...
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buildPhase = ''
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$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
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are resolved by their <literal>install_name</literal> at link
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time. Sometimes packages won't set this correctly causing the
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library lookups to fail at runtime. This can be fixed by adding
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extra linker flags or by running <command>install_name_tool -id</command>
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during the <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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Some packages assume xcode is available and use <command>xcrun</command>
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to resolve build tools like <command>clang</command>, etc.
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This causes errors like <code>xcode-select: error: no developer tools were found at '/Applications/Xcode.app'</code>
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while the build doesn't actually depend 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
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that really depend on Xcode, however projects that build some kind of
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graphical interface won't work without using Xcode in an impure way.
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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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