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newlib: fix newlib host/target workaround

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The newlib configury uses `host` to refer to the platform which is
being used to compile newlib.  Ugh.  It does this because of its
history: newlib used to be distributed with and built as part of
gcc.

To prevent nixpkgs from going insane, this package presents the
"normal" view to the outside world: the binaries in $out will
execute on `stdenv.hostPlatform`.  We then fool newlib's build
process into doing the right thing.
This commit is contained in:
Adam Joseph 2023-11-08 16:42:00 -08:00 committed by Adam Joseph
parent 4c5a455ca5
commit 1e47c87fd2
1 changed files with 23 additions and 1 deletions
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24
pkgs/development/misc/newlib/default.nix
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@ -31,14 +31,36 @@ stdenv.mkDerivation (finalAttrs: {
# newlib expects CC to build for build platform, not host platform
preConfigure = ''
export CC=cc
'' +
# newlib tries to disable itself when building for Linux *except*
# when native-compiling. Unfortunately the check for "is cross
# compiling" was written when newlib was part of GCC and newlib
# was built along with GCC (therefore newlib was built to execute
# on the targetPlatform, not the hostPlatform). Unfortunately
# when newlib was extracted from GCC, this "is cross compiling"
# logic was not fixed. So we must disable it.
''
substituteInPlace configure --replace 'noconfigdirs target-newlib target-libgloss' 'noconfigdirs'
'';
configurePlatforms = [ "build" "target" ];
# flags copied from https://community.arm.com/support-forums/f/compilers-and-libraries-forum/53310/gcc-arm-none-eabi-what-were-the-newlib-compilation-options
# sort alphabetically
configureFlags = [
"--with-newlib"
"--host=${stdenv.buildPlatform.config}"
# The newlib configury uses `host` to refer to the platform
# which is being used to compile newlib. Ugh. It does this
# because of its history: newlib used to be distributed with and
# built as part of gcc.
#
# To prevent nixpkgs from going insane, this package presents the
# "normal" view to the outside world: the binaries in $out will
# execute on `stdenv.hostPlatform`. We then fool newlib's build
# process into doing the right thing.
"--host=${stdenv.targetPlatform.config}"
] ++ (if !nanoizeNewlib then [
"--disable-newlib-supplied-syscalls"
"--disable-nls"