sci-libs/lapack: backport 64-bit API fix detected by LTO warnings

https://github.com/Reference-LAPACK/lapack/issues/990#issuecomment-1973258284

Bug: https://bugs.gentoo.org/878891
Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>
Signed-off-by: Sam James <sam@gentoo.org>

2 files changed, 153 insertions, 0 deletions

diff --git a/sci-libs/lapack/files/lapack-3.12.0-correct-64bit-interface.patch b/sci-libs/lapack/files/lapack-3.12.0-correct-64bit-interface.patch
new file mode 100644
index 000000000000..c9c9479f4522
--- /dev/null
+++ b/sci-libs/lapack/files/lapack-3.12.0-correct-64bit-interface.patch
@@ -0,0 +1,38 @@
+From 26db2da3eb84856d997e05caf9904a6b56eac1e8 Mon Sep 17 00:00:00 2001
+From: Simon Maertens <simon@slmaertens.dev>
+Date: Wed, 29 Nov 2023 14:30:30 +0000
+Subject: [PATCH] Fixed Fortran compiler flags check for nagfor compiler and
+ usage in CBLAS target
+
+---
+ CBLAS/CMakeLists.txt                 | 4 ++++
+ CMAKE/CheckLAPACKCompilerFlags.cmake | 1 +
+ 2 files changed, 5 insertions(+)
+
+diff --git a/CBLAS/CMakeLists.txt b/CBLAS/CMakeLists.txt
+index c276f7da3d..b01d795af9 100644
+--- a/CBLAS/CMakeLists.txt
++++ b/CBLAS/CMakeLists.txt
+@@ -14,6 +14,10 @@ if(CMAKE_Fortran_COMPILER)
+   FortranCInterface_HEADER(${LAPACK_BINARY_DIR}/include/cblas_mangling.h
+                           MACRO_NAMESPACE "F77_"
+                           SYMBOL_NAMESPACE "F77_")
++
++  # Check for any necessary platform specific compiler flags
++  include(CheckLAPACKCompilerFlags)
++  CheckLAPACKCompilerFlags()
+ endif()
+ if(NOT FortranCInterface_GLOBAL_FOUND OR NOT FortranCInterface_MODULE_FOUND)
+   message(WARNING "Reverting to pre-defined include/cblas_mangling.h")
+diff --git a/CMAKE/CheckLAPACKCompilerFlags.cmake b/CMAKE/CheckLAPACKCompilerFlags.cmake
+index ecb5009ae5..653b817583 100644
+--- a/CMAKE/CheckLAPACKCompilerFlags.cmake
++++ b/CMAKE/CheckLAPACKCompilerFlags.cmake
+@@ -177,6 +177,7 @@ elseif( CMAKE_Fortran_COMPILER_ID STREQUAL "NAG" )
+   endif()
+ 
+   # Suppress compiler banner and summary
++  include(CheckFortranCompilerFlag)
+   check_fortran_compiler_flag("-quiet" _quiet)
+   if( _quiet AND NOT ("${CMAKE_Fortran_FLAGS}" MATCHES "[-/]quiet") )
+     set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -quiet")
diff --git a/sci-libs/lapack/lapack-3.12.0-r1.ebuild b/sci-libs/lapack/lapack-3.12.0-r1.ebuild
new file mode 100644
index 000000000000..3a8b93eb620a
--- /dev/null
+++ b/sci-libs/lapack/lapack-3.12.0-r1.ebuild
@@ -0,0 +1,115 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+# Some additional tests are run if Python is found
+PYTHON_COMPAT=( python3_{10..11} )
+inherit cmake flag-o-matic fortran-2 python-any-r1
+
+DESCRIPTION="BLAS, CBLAS, LAPACK, LAPACKE reference implementations"
+HOMEPAGE="https://www.netlib.org/lapack/"
+SRC_URI="https://github.com/Reference-LAPACK/lapack/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos"
+# TODO: static-libs 64bit-index
+IUSE="lapacke deprecated doc eselect-ldso test"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	!app-eselect/eselect-cblas
+	virtual/fortran
+	eselect-ldso? (
+		>=app-eselect/eselect-blas-0.2
+		>=app-eselect/eselect-lapack-0.2
+	)
+	doc? ( app-doc/blas-docs )
+"
+DEPEND="${RDEPEND}"
+BDEPEND="
+	virtual/pkgconfig
+	test? ( ${PYTHON_DEPS} )
+"
+
+PATCHES=(
+	# fix -Werror=lto-type-mismatch caused by a bug that breaks
+	# the 64-bit interface for cblas
+	# https://github.com/Reference-LAPACK/lapack/issues/990#issuecomment-1973258284
+	# https://bugs.gentoo.org/878891
+	"${FILESDIR}"/lapack-3.12.0-correct-64bit-interface.patch
+)
+
+pkg_setup() {
+	fortran-2_pkg_setup
+	use test && python-any-r1_pkg_setup
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DCBLAS=ON
+		-DLAPACKE=$(usex lapacke)
+		-DBUILD_DEPRECATED=$(usex deprecated)
+		-DBUILD_SHARED_LIBS=ON
+		-DBUILD_TESTING=$(usex test)
+		-DLAPACK_TESTING_USE_PYTHON=$(usex test)
+		# Breaks cross
+		-DTEST_FORTRAN_COMPILER=OFF
+	)
+
+	cmake_src_configure
+}
+
+src_install() {
+	cmake_src_install
+
+	use eselect-ldso || return
+	# Create private lib directory for eselect::blas (ld.so.conf)
+	dodir /usr/$(get_libdir)/blas/reference
+	dosym -r /usr/$(get_libdir)/libblas.so /usr/$(get_libdir)/blas/reference/libblas.so
+	dosym -r /usr/$(get_libdir)/libblas.so.3 /usr/$(get_libdir)/blas/reference/libblas.so.3
+	dosym -r /usr/$(get_libdir)/libcblas.so /usr/$(get_libdir)/blas/reference/libcblas.so
+	dosym -r /usr/$(get_libdir)/libcblas.so.3 /usr/$(get_libdir)/blas/reference/libcblas.so.3
+
+	# Create private lib directory for eselect::lapack (ld.so.conf)
+	dodir /usr/$(get_libdir)/lapack/reference
+	dosym -r /usr/$(get_libdir)/liblapack.so /usr/$(get_libdir)/lapack/reference/liblapack.so
+	dosym -r /usr/$(get_libdir)/liblapack.so.3 /usr/$(get_libdir)/lapack/reference/liblapack.so.3
+}
+
+pkg_postinst() {
+	use eselect-ldso || return
+
+	local me=reference libdir=$(get_libdir)
+	# check eselect-blas
+	eselect blas add ${libdir} "${EPREFIX}"/usr/${libdir}/blas/${me} ${me}
+	local current_blas=$(eselect blas show ${libdir} | cut -d' ' -f2)
+	if [[ ${current_blas} == ${me} || -z ${current_blas} ]]; then
+		eselect blas set ${libdir} ${me}
+		elog "Current eselect: BLAS ($libdir) -> [${current_blas}]."
+	else
+		elog "Current eselect: BLAS ($libdir) -> [${current_blas}]."
+		elog "To use blas [${me}] implementation, you have to issue (as root):"
+		elog "\t eselect blas set ${libdir} ${me}"
+	fi
+
+	# check eselect-lapack
+	eselect lapack add ${libdir} "${EPREFIX}"/usr/${libdir}/lapack/${me} ${me}
+	local current_lapack=$(eselect lapack show ${libdir} | cut -d' ' -f2)
+	if [[ ${current_lapack} == ${me} || -z ${current_lapack} ]]; then
+		eselect lapack set ${libdir} ${me}
+		elog "Current eselect: LAPACK ($libdir) -> [${current_lapack}]."
+	else
+		elog "Current eselect: LAPACK ($libdir) -> [${current_lapack}]."
+		elog "To use lapack [${me}] implementation, you have to issue (as root):"
+		elog "\t eselect lapack set ${libdir} ${me}"
+	fi
+}
+
+pkg_postrm() {
+	use eselect-ldso || return
+
+	eselect blas validate
+	eselect lapack validate
+}