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{ lib
, stdenv
, version, buildPlatform, hostPlatform, targetPlatform
, gnat-bootstrap ? null
, langAda ? false
, langFortran
, langJava ? false
, langJit ? false
, langGo
, withoutTargetLibc
, enableShared
, enableMultilib
, pkgsBuildTarget
}:
assert langJava -> lib.versionOlder version "7";
assert langAda -> gnat-bootstrap != null; let
needsLib
= (lib.versionOlder version "7" && (langJava || langGo))
|| (lib.versions.major version == "4" && lib.versions.minor version == "9" && targetPlatform.isDarwin);
in lib.optionalString (hostPlatform.isSunOS && hostPlatform.is64bit) ''
export NIX_LDFLAGS=`echo $NIX_LDFLAGS | sed -e s~$prefix/lib~$prefix/lib/amd64~g`
export LDFLAGS_FOR_TARGET="-Wl,-rpath,$prefix/lib/amd64 $LDFLAGS_FOR_TARGET"
export CXXFLAGS_FOR_TARGET="-Wl,-rpath,$prefix/lib/amd64 $CXXFLAGS_FOR_TARGET"
export CFLAGS_FOR_TARGET="-Wl,-rpath,$prefix/lib/amd64 $CFLAGS_FOR_TARGET"
'' + lib.optionalString needsLib ''
export lib=$out;
'' + lib.optionalString langAda ''
export PATH=${gnat-bootstrap}/bin:$PATH
''
# For a cross-built native compiler, i.e. build!=(host==target), the
# bundled libgfortran needs a gfortran which can run on the
# buildPlatform and emit code for the targetPlatform. The compiler
# which is built alongside gfortran in this configuration doesn't
# meet that need: it runs on the hostPlatform.
+ lib.optionalString (langFortran && (with stdenv; buildPlatform != hostPlatform && hostPlatform == targetPlatform)) ''
export GFORTRAN_FOR_TARGET=${pkgsBuildTarget.gfortran}/bin/${stdenv.targetPlatform.config}-gfortran
''
# On x86_64-darwin, the gnat-bootstrap bootstrap compiler that we need to build a
# native GCC with Ada support emits assembly that is accepted by the Clang
# integrated assembler, but not by the GNU assembler in cctools-port that Nix
# usually in the x86_64-darwin stdenv. In particular, x86_64-darwin gnat-bootstrap
# emits MOVQ as the mnemonic for quadword interunit moves, such as between XMM
# and general registers (e.g "movq %xmm0, %rbp"); the cctools-port assembler,
# however, only recognises MOVD for such moves.
#
# Therefore, for native x86_64-darwin builds that support Ada, we have to use
# the Clang integrated assembler to build (at least stage 1 of) GCC, but have to
# target GCC at the cctools-port GNU assembler. In the wrapped x86_64-darwin
# gnat-bootstrap, the former is provided as `as`, while the latter is provided as
# `gas`.
#
+ lib.optionalString (
langAda
&& buildPlatform == hostPlatform
&& hostPlatform == targetPlatform
&& targetPlatform.isx86_64
&& targetPlatform.isDarwin
) ''
export AS_FOR_BUILD=${gnat-bootstrap}/bin/as
export AS_FOR_TARGET=${gnat-bootstrap}/bin/gas
''
# NOTE 2020/3/18: This environment variable prevents configure scripts from
# detecting the presence of aligned_alloc on Darwin. There are many facts that
# collectively make this fix necessary:
# - Nix uses a fixed set of standard library headers on all MacOS systems,
# regardless of their actual version. (Nix uses version 10.12 headers.)
# - Nix uses the native standard library binaries for the build system. That
# means the standard library binaries may not exactly match the standard
# library headers.
# - The aligned_alloc procedure is present in MacOS 10.15 (Catalina), but not
# in earlier versions. Therefore on Catalina systems, aligned_alloc is
# linkable (i.e. present in the binary libraries) but not present in the
# headers.
# - Configure scripts detect a procedure's existence by checking whether it is
# linkable. They do not check whether it is present in the headers.
# - GCC throws an error during compilation because aligned_alloc is not
# defined in the headers---even though the linker can see it.
#
# This fix would not be necessary if ANY of the above were false:
# - If Nix used native headers for each different MacOS version, aligned_alloc
# would be in the headers on Catalina.
# - If Nix used the same library binaries for each MacOS version, aligned_alloc
# would not be in the library binaries.
# - If Catalina did not include aligned_alloc, this wouldn't be a problem.
# - If the configure scripts looked for header presence as well as
# linkability, they would see that aligned_alloc is missing.
# - If GCC allowed implicit declaration of symbols, it would not fail during
# compilation even if the configure scripts did not check header presence.
#
+ lib.optionalString (buildPlatform.isDarwin) ''
export build_configargs=ac_cv_func_aligned_alloc=no
'' + lib.optionalString (hostPlatform.isDarwin) ''
export host_configargs=ac_cv_func_aligned_alloc=no
'' + lib.optionalString (targetPlatform.isDarwin) ''
export target_configargs=ac_cv_func_aligned_alloc=no
''
# In order to properly install libgccjit on macOS Catalina, strip(1)
# upon installation must not remove external symbols, otherwise the
# install step errors with "symbols referenced by indirect symbol
# table entries that can't be stripped".
+ lib.optionalString (hostPlatform.isDarwin && langJit) ''
export STRIP='strip -x'
''
# HACK: if host and target config are the same, but the platforms are
# actually different we need to convince the configure script that it
# is in fact building a cross compiler although it doesn't believe it.
+ lib.optionalString (targetPlatform.config == hostPlatform.config && targetPlatform != hostPlatform) ''
substituteInPlace configure --replace is_cross_compiler=no is_cross_compiler=yes
''
# Normally (for host != target case) --without-headers automatically
# enables 'inhibit_libc=true' in gcc's gcc/configure.ac. But case of
# gcc->clang or dynamic->static "cross"-compilation manages to evade it: there
# hostPlatform != targetPlatform, hostPlatform.config == targetPlatform.config.
# We explicitly inhibit libc headers use in this case as well.
+ lib.optionalString (targetPlatform != hostPlatform &&
withoutTargetLibc &&
targetPlatform.config == hostPlatform.config) ''
export inhibit_libc=true
''
+ lib.optionalString (targetPlatform != hostPlatform && withoutTargetLibc && enableShared)
(import ./libgcc-buildstuff.nix { inherit lib stdenv; })
|