Move igraph to host and remove unneeded dependenies

Remove the CMake call and instead point to external `igraph`

Author: xylar

recipe/bld.bat

@@ -1,24 +1,11 @@
 @echo on
 
-mkdir build
-if errorlevel 1 exit 1
+rem Build python-igraph against the externally provided libigraph from conda-forge
+rem Use pkg-config to discover headers and libraries.
+set IGRAPH_USE_PKG_CONFIG=1
 
-set IGRAPH_CMAKE_EXTRA_ARGS=^
-      %CMAKE_ARGS% ^
-      -GNinja ^
-      -DCMAKE_BUILD_TYPE=Release ^
-      -DCMAKE_INSTALL_PREFIX=%SRC_DIR%/vendor/install/igraph ^
-      -DCMAKE_POSITION_INDEPENDENT_CODE=ON ^
-      -DIGRAPH_USE_INTERNAL_BLAS=0 ^
-      -DIGRAPH_USE_INTERNAL_LAPACK=0 ^
-      -DIGRAPH_USE_INTERNAL_ARPACK=1 ^
-      -DIGRAPH_USE_INTERNAL_GLPK=0 ^
-      -DIGRAPH_USE_INTERNAL_GMP=0 ^
-      -DBUILD_SHARED_LIBS=OFF ^
-      -DIGRAPH_ENABLE_LTO=AUTO ^
-      -DIGRAPH_ENABLE_TLS=1 ^
-      -DIGRAPH_GRAPHML_SUPPORT=1
-set IGRAPH_EXTRA_LIBRARIES=gmp,blas,glpk,lapack,libxml2
+rem Ensure pkg-config can find igraph.pc from the host env (both common locations)
+set "PKG_CONFIG_PATH=%PREFIX%\Library\lib\pkgconfig;%PREFIX%\lib\pkgconfig;%PKG_CONFIG_PATH%"
 
 %PYTHON% -m pip install --no-deps --no-build-isolation --ignore-installed . -vvv
 if errorlevel 1 exit 1

recipe/build.sh

@@ -1,26 +1,10 @@
 #!/bin/env bash
 
-export IGRAPH_CMAKE_EXTRA_ARGS="
-    ${CMAKE_ARGS} \
-    -GNinja \
-    -DCMAKE_BUILD_TYPE=Release \
-    -DCMAKE_INSTALL_PREFIX=${SRC_DIR}/vendor/install/igraph \
-    -DCMAKE_C_FLAGS=\"${CFLAGS}\" \
-    -DCMAKE_CPP_FLAGS=\"${CPPFLAGS}\" \
-    -DCMAKE_CXX_FLAGS=\"${CXXFLAGS}\" \
-    -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
-    -DF2C_EXTERNAL_ARITH_HEADER=${F2C_EXTERNAL_ARITH_HEADER} \
-    -DIGRAPH_USE_INTERNAL_BLAS=0 \
-    -DIGRAPH_USE_INTERNAL_LAPACK=0 \
-    -DIGRAPH_USE_INTERNAL_ARPACK=0 \
-    -DIGRAPH_USE_INTERNAL_GLPK=0 \
-    -DIGRAPH_USE_INTERNAL_CXSPARSE=0 \
-    -DIGRAPH_USE_INTERNAL_GMP=0 \
-    -DBUILD_SHARED_LIBS=OFF \
-    -DIGRAPH_ENABLE_LTO=AUTO \
-    -DIGRAPH_ENABLE_TLS=1 \
-    -DBLAS_LIBRARIES=\"${PREFIX}/lib/libblas${SHLIB_EXT}\" \
-    -DLAPACK_LIBRARIES=\"${PREFIX}/lib/liblapack${SHLIB_EXT}\"
-    "
+# Build python-igraph against the externally provided libigraph from conda-forge
+# Use pkg-config to discover headers and libraries.
+export IGRAPH_USE_PKG_CONFIG=1
+
+# Ensure pkg-config can find igraph.pc from the host env
+export PKG_CONFIG_PATH="${PREFIX}/lib/pkgconfig:${PKG_CONFIG_PATH}"
 
 ${PYTHON} -m pip install --no-deps --no-build-isolation --ignore-installed . -vvv

recipe/meta.yaml

@@ -14,45 +14,23 @@ source:
 
 build:
   number: 3
-  script_env:
-    - F2C_EXTERNAL_ARITH_HEADER={{ RECIPE_DIR }}/arith_arm64.h  # [arm64]
-
-  run_exports:
-    - {{ pin_subpackage("python-igraph", max_pin="x.x") }}
 
 requirements:
   build:
     - python                                 # [build_platform != target_platform]
     - cross-python_{{ target_platform }}     # [build_platform != target_platform]
-    - libtool  # [unix]
     - {{ compiler('c') }}
     - {{ stdlib("c") }}
     - {{ compiler('cxx') }}
-    # just to make cmake happy
-    - bison  # [osx and arm64]
-    - cmake
-    - ninja
-    - make  # [not win]
-    - pkg-config  # [not win]
+    - pkg-config
   host:
-    - glpk
-    - libxml2-devel
-    - arpack   # [not win]
-    - gmp
-    - libblas
-    - liblapack
     - python
     - pip
     - setuptools >=64,<72.2.0
-    - zlib
+    - igraph >=0.10,<0.11
   run:
-    - glpk
-    - libxml2-devel
-    - arpack  # [not win]
-    - gmp
-    - texttable >=1.6.2
     - python
-    - igraph >=0.10,<0.11
+    - texttable >=1.6.2
 
 test:
   source_files:
@@ -68,9 +46,7 @@ test:
 about:
   home: https://igraph.org/python/
   license: GPL-2.0-or-later
-  license_file:
-    - LICENSE
-    - vendor/source/igraph/ACKNOWLEDGEMENTS.md
+  license_file: LICENSE
   summary: High performance graph data structures and algorithms
   dev_url: https://github.com/igraph/python-igraph
   doc_url: https://igraph.org/python/#docs