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authorFrederik Rietdijk <fridh@fridh.nl>2019-10-30 10:29:10 +0100
committerFrederik Rietdijk <fridh@fridh.nl>2019-10-30 11:17:14 +0100
commit680f6238bd8f8bd7d5c58382e87d343158934e27 (patch)
treec96163971d0ea53d856e220fa15af4a5f547b599 /doc/platform-notes.xml
parentddbf4c1bac20f6061d4b42a901545eaf345067df (diff)
nixpkgs manual: move stdenv chapters into one folder
Diffstat (limited to 'doc/platform-notes.xml')
-rw-r--r--doc/platform-notes.xml83
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diff --git a/doc/platform-notes.xml b/doc/platform-notes.xml
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--- a/doc/platform-notes.xml
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-<chapter xmlns="http://docbook.org/ns/docbook"
- xmlns:xlink="http://www.w3.org/1999/xlink"
- xml:id="chap-platform-notes">
- <title>Platform Notes</title>
- <section xml:id="sec-darwin">
- <title>Darwin (macOS)</title>
-
- <para>
- Some common issues when packaging software for Darwin:
- </para>
-
- <itemizedlist>
- <listitem>
- <para>
- The Darwin <literal>stdenv</literal> uses clang instead of gcc. When referring to the compiler <varname>$CC</varname> or <command>cc</command> will work in both cases. Some builds hardcode gcc/g++ in their build scripts, that can usually be fixed with using something like <literal>makeFlags = [ "CC=cc" ];</literal> or by patching the build scripts.
- </para>
-<programlisting>
-stdenv.mkDerivation {
- name = "libfoo-1.2.3";
- # ...
- buildPhase = ''
- $CC -o hello hello.c
- '';
-}
-</programlisting>
- </listitem>
- <listitem>
- <para>
- On Darwin, libraries are linked using absolute paths, libraries are resolved by their <literal>install_name</literal> at link time. Sometimes packages won't set this correctly causing the library lookups to fail at runtime. This can be fixed by adding extra linker flags or by running <command>install_name_tool -id</command> during the <function>fixupPhase</function>.
- </para>
-<programlisting>
-stdenv.mkDerivation {
- name = "libfoo-1.2.3";
- # ...
- makeFlags = stdenv.lib.optional stdenv.isDarwin "LDFLAGS=-Wl,-install_name,$(out)/lib/libfoo.dylib";
-}
-</programlisting>
- </listitem>
- <listitem>
- <para>
- Even if the libraries are linked using absolute paths and resolved via their <literal>install_name</literal> correctly, tests can sometimes fail to run binaries. This happens because the <varname>checkPhase</varname> runs before the libraries are installed.
- </para>
- <para>
- This can usually be solved by running the tests after the <varname>installPhase</varname> or alternatively by using <varname>DYLD_LIBRARY_PATH</varname>. More information about this variable can be found in the <citerefentry>
- <refentrytitle>dyld</refentrytitle>
- <manvolnum>1</manvolnum></citerefentry> manpage.
- </para>
-<programlisting>
-dyld: Library not loaded: /nix/store/7hnmbscpayxzxrixrgxvvlifzlxdsdir-jq-1.5-lib/lib/libjq.1.dylib
-Referenced from: /private/tmp/nix-build-jq-1.5.drv-0/jq-1.5/tests/../jq
-Reason: image not found
-./tests/jqtest: line 5: 75779 Abort trap: 6
-</programlisting>
-<programlisting>
-stdenv.mkDerivation {
- name = "libfoo-1.2.3";
- # ...
- doInstallCheck = true;
- installCheckTarget = "check";
-}
-</programlisting>
- </listitem>
- <listitem>
- <para>
- Some packages assume xcode is available and use <command>xcrun</command> to resolve build tools like <command>clang</command>, etc. This causes errors like <code>xcode-select: error: no developer tools were found at '/Applications/Xcode.app'</code> while the build doesn't actually depend on xcode.
- </para>
-<programlisting>
-stdenv.mkDerivation {
- name = "libfoo-1.2.3";
- # ...
- prePatch = ''
- substituteInPlace Makefile \
- --replace '/usr/bin/xcrun clang' clang
- '';
-}
-</programlisting>
- <para>
- The package <literal>xcbuild</literal> can be used to build projects that really depend on Xcode. However, this replacement is not 100% compatible with Xcode and can occasionally cause issues.
- </para>
- </listitem>
- </itemizedlist>
- </section>
-</chapter>