dev-python/cvxopt: new revision to cleanup and re-messup some things.

The original purpose of this revision was to refactor the three,
similar, convoluted pipelines that are used to parse the output from
pkg-config and populate cvxopt's FOO_LIB, FOO_LIB_DIR, and FOO_INC_DIR
variables. That was fairly easy: the code to strip out "pthread" and
"m" from `pkg-config --libs-only-l` never worked, so I've dropped
it. After that, the remaining three pipelines all did essentially the
same thing and were combined into a single function that is still
large but now only because it is documented.

Having solved that problem, I made things a bit messy again. I
discovered that most of these variables can be passed an empty string,
resulting in a command line with "empty" arguments like "-L
-L/path/to/wherever" and GCC will accept that. What it won't accept is
the empty "-I" arguments corresponding to the INC_DIR variables. Can
we leave those unset if pkg-config returns the empty string? No!
Because if we do that, then cvxopt will guess the wrong location
(outside of EPREFIX) and attempt to use that. So I added some code to
prepopulate those variables with the right location, and only append
to them when pkg-config gives us something to append.

I think this works better, but I guess we'll see. I've opened an
upstream issue about the empty string problem in these variables. If
they can make the "API" a bit nicer in the future, a lot of the new
ugliness can be reverted.

Package-Manager: Portage-2.3.99, Repoman-2.3.22
Signed-off-by: Michael Orlitzky <mjo@gentoo.org>

diff --git a/dev-python/cvxopt/cvxopt-1.2.5-r1.ebuild b/dev-python/cvxopt/cvxopt-1.2.5-r1.ebuild
new file mode 100644 (file)
index 0000000..c467012
--- /dev/null
+++ b/dev-python/cvxopt/cvxopt-1.2.5-r1.ebuild
@@ -0,0 +1,174 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python3_6 python3_7 python3_8 )
+
+inherit distutils-r1 toolchain-funcs
+
+DESCRIPTION="Python package for convex optimization"
+HOMEPAGE="http://cvxopt.org/ https://github.com/cvxopt/cvxopt"
+SRC_URI="https://github.com/${PN}/${PN}/archive/${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
+IUSE="doc +dsdp examples fftw +glpk gsl test"
+RESTRICT="!test? ( test )"
+
+DEPEND="
+       virtual/blas
+       virtual/lapack
+       sci-libs/amd:0=
+       sci-libs/cholmod:0=
+       sci-libs/colamd:0=
+       sci-libs/suitesparseconfig:0=
+       sci-libs/umfpack:0=
+       dsdp? ( sci-libs/dsdp:0= )
+       fftw? ( sci-libs/fftw:3.0= )
+       glpk? ( >=sci-mathematics/glpk-4.49:0= )
+       gsl? ( sci-libs/gsl:0= )"
+
+RDEPEND="${DEPEND}"
+
+BDEPEND="virtual/pkgconfig
+       doc? ( dev-python/sphinx )
+       test? ( ${RDEPEND} dev-python/nose[${PYTHON_USEDEP}] )"
+
+# The BLAS_LIB and LAPACK_LIB variables (among others) in cvxopt's
+# setup.py are passed in as colon-delimited strings. So, for example,
+# if your blas "l" flags are "-lblas -lcblas", then cvxopt wants
+# "blas;cblas" for BLAS_LIB.
+#
+# The following function takes a flag type ("l", "L", or "I") as its
+# first argument and a list of packages as its remaining arguments. It
+# outputs a list of libraries, library paths, or include paths,
+# respectively, for the given packages, retrieved using pkg-config and
+# deduplicated, in the appropriate format.
+#
+cvxopt_output() {
+       local FLAGNAME="${1}"
+       shift
+       local PACKAGES="${@}"
+
+       local PKGCONFIG_MODE
+       case "${FLAGNAME}" in
+       l) PKGCONFIG_MODE="--libs-only-l";;
+       L) PKGCONFIG_MODE="--libs-only-L";;
+       I) PKGCONFIG_MODE="--cflags-only-I";;
+       *) echo "invalid flag name: ${FLAGNAME}"; exit 1;;
+       esac
+
+       local CVXOPT_OUTPUT=""
+       local PKGCONFIG_ITEM
+       for PKGCONFIG_ITEM in $($(tc-getPKG_CONFIG) ${PKGCONFIG_MODE} ${PACKAGES})
+       do
+       # First strip off the leading "-l", "-L", or "-I", and replace
+       # it with a semicolon...
+       PKGCONFIG_ITEM=";${PKGCONFIG_ITEM#-${FLAGNAME}}"
+
+       # Now check to see if this element is already present in the
+       # list, and skip it if it is. This eliminates multiple entries
+       # from winding up in the list when multiple package arguments are
+       # passed to this function.
+       if [[ "${CVXOPT_OUTPUT}" != "${CVXOPT_OUTPUT%${PKGCONFIG_ITEM}}" ]]
+       then
+               # It was already the last entry in the list, so skip it.
+               continue
+       elif [[ "${CVXOPT_OUTPUT}" != "${CVXOPT_OUTPUT%${PKGCONFIG_ITEM};*}" ]]
+       then
+               # It was an earlier entry in the list. These two cases are
+               # separate to ensure that we can e.g. find ";m" at the end
+               # of the list, but that we don't find ";metis" in the process.
+               continue
+       fi
+
+       # It isn't in the list yet, so append it.
+       CVXOPT_OUTPUT+="${PKGCONFIG_ITEM}"
+       done
+
+       # Strip the leading ";" from ";foo;bar" before output.
+       echo "${CVXOPT_OUTPUT#;}"
+}
+
+python_prepare_all() {
+       # Mandatory dependencies.
+       export CVXOPT_BLAS_LIB="$(cvxopt_output l blas)"
+       export CVXOPT_BLAS_LIB_DIR="${EPREFIX}/usr/$(get_libdir);$(cvxopt_output L blas)"
+       export CVXOPT_LAPACK_LIB="$(cvxopt_output l lapack)"
+       export CVXOPT_SUITESPARSE_LIB_DIR="${EPREFIX}/usr/$(get_libdir);$(cvxopt_output L umfpack cholmod amd colamd suitesparseconfig)"
+
+       # Most of these CVXOPT_* variables can be blank or have "empty"
+       # entries and the resulting command-line with e.g. "-L -L/some/path"
+       # won't hurt anything. The INC_DIR variables, however, cause
+       # problems, because at least gcc doesn't like a bare "-I". We
+       # pre-populate these variable with something safe so that setup.py
+       # doesn't look in the wrong place if pkg-config doesn't return any
+       # extra -I directories. This is
+       #
+       #  https://github.com/cvxopt/cvxopt/issues/167
+       #
+       CVXOPT_SUITESPARSE_INC_DIR="${EPREFIX}/usr/include"
+       local SUITESPARSE_LOCAL_INCS="$(cvxopt_output I umfpack cholmod amd colamd suitesparseconfig)"
+       if [[ -n "${SUITESPARSE_LOCAL_INCS}" ]]; then
+               CVXOPT_SUITESPARSE_INC_DIR+=";${SUITESPARSE_LOCAL_INCS}"
+       fi
+       export CVXOPT_SUITESPARSE_INC_DIR
+
+       # optional dependencies
+       if use dsdp; then
+               # no pkg-config file at the moment
+               export CVXOPT_BUILD_DSDP=1
+               export CVXOPT_DSDP_LIB_DIR="${EPREFIX}/usr/$(get_libdir)"
+               export CVXOPT_DSDP_INC_DIR="${EPREFIX}/usr/include"
+       fi
+
+       if use fftw; then
+               export CVXOPT_BUILD_FFTW=1
+               export CVXOPT_FFTW_LIB_DIR="${EPREFIX}/usr/$(get_libdir);$(cvxopt_output L fftw3)"
+               CVXOPT_FFTW_INC_DIR="${EPREFIX}/usr/include"
+               FFTW_LOCAL_INCS="$(cvxopt_output I fftw3)"
+               if [[ -n "${FFTW_LOCAL_INCS}" ]]; then
+                       CVXOPT_FFTW_INC_DIR+=";${FFTW_LOCAL_INCS}"
+               fi
+               export CVXOPT_FFTW_INC_DIR
+       fi
+
+       if use glpk; then
+               # no pkg-config file at the moment
+               export CVXOPT_BUILD_GLPK=1
+               export CVXOPT_GLPK_LIB_DIR="${EPREFIX}/usr/$(get_libdir)"
+               export CVXOPT_GLPK_INC_DIR="${EPREFIX}/usr/include"
+       fi
+
+       if use gsl; then
+               export CVXOPT_BUILD_GSL=1
+               export CVXOPT_GSL_LIB_DIR="${EPREFIX}/usr/$(get_libdir);$(cvxopt_output L gsl)"
+               CVXOPT_GSL_INC_DIR="${EPREFIX}/usr/include"
+               GSL_LOCAL_INCS="$(cvxopt_output I gsl)"
+               if [[ -n "${GSL_LOCAL_INCS}" ]]; then
+                       CVXOPT_GSL_INC_DIR+=";${GSL_LOCAL_INCS}"
+               fi
+               export CVXOPT_GSL_INC_DIR
+       fi
+
+       distutils-r1_python_prepare_all
+}
+
+python_compile_all() {
+       use doc && VARTEXFONTS="${T}/fonts" emake -C doc -B html
+}
+
+python_test() {
+       PYTHONPATH="${BUILD_DIR}"/lib nosetests -v || die
+}
+
+python_install_all() {
+       use doc && HTML_DOCS=( doc/build/html/. )
+       distutils-r1_python_install_all
+       if use examples; then
+               dodoc -r examples
+               docompress -x "/usr/share/doc/${PF}/examples"
+       fi
+}