C: Difference between revisions
imported>Mic92 short passage about cross-compiling |
imported>Mic92 mention debug symbols |
||
| Line 180: | Line 180: | ||
== Cross-Compiling == | == Cross-Compiling == | ||
To get access to a cross-compiling toolchain use | To get access to a cross-compiling toolchain use <code>pkgsCross</code> prefix. | ||
In this example we load the compiler for the arm-embedded target (bare metal without operating system): | In this example we load the compiler for the arm-embedded target (bare metal without operating system): | ||
| Line 199: | Line 199: | ||
Well behaved build systems should respect these environment variables when building projects. | Well behaved build systems should respect these environment variables when building projects. | ||
Also take a look in the [[Cross Compiling]] article for further information on cross-compiling. | Also take a look in the [[Cross Compiling]] article for further information on cross-compiling. | ||
== Debug symbols == | |||
By default debug symbols are stripped of in the fixup phase of a package build. | |||
To get a library with debug symbols one can use the <code>enableDebugging</code> | |||
function to disable stripping: | |||
<syntaxHighlight lang=nix> | |||
with import <nixpkgs> {}; | |||
stdenv.mkDerivation { | |||
name = "env"; | |||
buildInputs = [ (enableDebugging zlib) ]; | |||
} | |||
</syntaxHighlight> | |||
<syntaxHighlight lang=console> | |||
$ echo $NIX_LDFLAGS | |||
-rpath /nix/store/fqpmgpcij4dddckkw4wh53ffn31yv1y6-env/lib64 -rpath /nix/store/fqpmgpcij4dddckkw4wh53ffn31yv1y6-env/lib -L/nix/store/g2y1122bwz5434w6nx34s40f2hmdkb1z-zlib-1.2.11/lib -L/nix/store/g2y1122bwz5434w6nx34s40f2hmdkb1z-zlib-1.2.11/lib | |||
$ file /nix/store/g2y1122bwz5434w6nx34s40f2hmdkb1z-zlib-1.2.11/lib/libz.so.1.2.11 | |||
/nix/store/g2y1122bwz5434w6nx34s40f2hmdkb1z-zlib-1.2.11/lib/libz.so.1.2.11: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, with debug_info, not stripped | |||
</syntaxHighlight> | |||
It also possible to separate debug symbols from the actual binaries and store them in a different output by using the <code>separateDebugInfo</code> option. | |||
This is described in the [https://nixos.org/nixpkgs/manual/#ssec-fixup-phase manual]. | |||
Also see [[Debug Symbols]] for further information about debug symbols. | |||