# We only contain headers, but we want to be an arch
# specific package since SGX is only included on x86
%define debug_package %{nil}

Summary: The GNU libc libraries for SGX enclave builds
Name: sgx-compat-glibc-headers2.38
Version: 2.38
Release: 1%{?dist}
# Sync from native glibc.spec
License: LGPLv2+ and LGPLv2+ with exceptions and GPLv2+ and GPLv2+ with exceptions and BSD and Inner-Net and ISC and Public Domain and GFDL

URL: http://www.gnu.org/software/glibc/
Source0: https://ftp.gnu.org/gnu/glibc/glibc-%{version}.tar.xz
Source1: headers.sha256

# SGX is a technology that only exists in Intel x86 CPUs
ExclusiveArch: x86_64

BuildRequires: sgx-srpm-macros
BuildRequires: gcc
BuildRequires: make
BuildRequires: bison
BuildRequires: python3

%description
The glibc package contains standard libraries which are used by
multiple programs on the system. In order to save disk space and
memory, as well as to make upgrading easier, common system code is
kept in one place and shared between programs. This particular package
contains the most important sets of shared libraries: the standard C
library and the standard math library. Without these two libraries, a
Linux system will not function.

This variant of the glibc package provides headers only, as needed
for the reproducible build of SGX enclaves.

%prep
%autosetup -n glibc-%{version} -p1

%build
# libc_nonshared.a cannot be built with the default hardening flags
# because the glibc build system is incompatible with
# -D_FORTIFY_SOURCE.  The object files need to be marked as to be
# skipped in annobin annotations.  (The -specs= variant of activating
# annobin does not work here because of flag ordering issues.)
# See <https://bugzilla.redhat.com/show_bug.cgi?id=1668822>.
BuildFlagsNonshared="-fplugin=annobin -fplugin-arg-annobin-disable -Wa,--generate-missing-build-notes=yes"

%define enablekernel 3.2
EnableKernel="--enable-kernel=%{enablekernel}"

mkdir build
pushd build
../configure \
        CC=gcc CXX=g++ \
	'CFLAGS=-O2 -g -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=x86-64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 ' \
        --prefix=%{sgx_prefix} \
        --includedir=%{sgx_includedir}/glibc-%{version} \
	--with-headers=%{_prefix}/include $EnableKernel \
	--with-nonshared-cflags="$BuildFlagsNonshared" \
	--enable-bind-now \
	--build=%{_target_cpu}-redhat-linux \
	--with-rtld-early-cflags=-march=x86-64 \
	--enable-stack-protector=strong \
	--disable-multi-arch \
	--disable-werror \
	--disable-profile \
	--without-selinux \
	--without-gd ||
	{ cat config.log; false; }

make gnu/lib-names-64.h

%install
cd build
%make_build install_root=%{buildroot} install-headers

cp gnu/lib-names-64.h %{buildroot}%{sgx_includedir}/glibc-%{version}/gnu/

%check

# Validate that the headers we've instaled match the headers
# from the NixOS package. This is a sanity check to make it
# easier to diagnose reproducibilty problems as early as possible

(cd %{buildroot}%{sgx_includedir}/glibc-%{version} && \
 find -type f | sort | xargs sha256sum) > headers.got

# We're not building the stubs headers and they don't matter
# since we're not building the library either.
grep -v gnu/stubs %{SOURCE1} > headers.want

diff headers.want headers.got

%files
%license COPYING COPYING.LIB LICENSES
%dir %{sgx_prefix}
%dir %{sgx_includedir}
%{sgx_includedir}/glibc-%{version}/