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lib: Infer libc field of platform if not specified

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This is especially useful when not cross compiling. It means we can
remove the `stdenv.isGlibc` predicate too.

Additionally, use this to simplify the logic to choose the
appropriate libiconv derivation.
This commit is contained in:
John Ericson 2017-05-21 14:02:19 -04:00
parent 2e7ec6fb70
commit c5c6606048
3 changed files with 19 additions and 12 deletions
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6
lib/systems/default.nix
View file

@ -21,6 +21,12 @@ rec {
config = parse.tripleFromSystem final.parsed;
# Just a guess, based on `system`
platform = platforms.selectBySystem final.system;
libc =
/**/ if final.isDarwin then "libSystem"
else if final.isMinGW then "msvcrt"
else if final.isLinux then "glibc"
# TODO(@Ericson2314) think more about other operating systems
else "native/impure";
} // mapAttrs (n: v: v final.parsed) inspect.predicates
// args;
in final;

3
pkgs/stdenv/generic/default.nix
View file

@ -402,9 +402,6 @@ let
|| system == "aarch64-linux"
|| system == "mips64el-linux";
isGNU = system == "i686-gnu"; # GNU/Hurd
isGlibc = isGNU # useful for `stdenvNative'
|| isLinux
|| system == "x86_64-kfreebsd-gnu";
isSunOS = system == "i686-solaris"
|| system == "x86_64-solaris";
isCygwin = system == "i686-cygwin"

22
pkgs/top-level/all-packages.nix
View file

@ -8653,15 +8653,19 @@ with pkgs;
libgsf = callPackage ../development/libraries/libgsf { };
# glibc provides libiconv so systems with glibc don't need to build libiconv
# separately, but we also provide libiconvReal, which will always be a
# standalone libiconv, just in case you want it
libiconv = if stdenv ? cross then
(if stdenv.cross.libc == "glibc" then libcCross
else if stdenv.cross.libc == "libSystem" then darwin.libiconv
else libiconvReal)
else if stdenv.isGlibc then glibcIconv stdenv.cc.libc
else if stdenv.isDarwin then darwin.libiconv
# GNU libc provides libiconv so systems with glibc don't need to build
# libiconv separately. Additionally, Apple forked/repackaged libiconv so we
# use that instead of the vanilla version on that OS.
#
# We also provide `libiconvReal`, which will always be a standalone libiconv,
# just in case you want it regardless of platform.
libiconv =
if hostPlatform.libc == "glibc"
then glibcIconv (if hostPlatform != buildPlatform
then libcCross
else stdenv.cc.libc)
else if hostPlatform.isDarwin
then darwin.libiconv
else libiconvReal;
glibcIconv = libc: let