Make local rattler package builds prove Python and R loads

The rattler recipes need to build from the repository root, link R's final shared object against system TIFF, and keep generated R symbols parseable. The Python recipe path is corrected for the recipes/py location, while the R recipe explicitly enables conda TIFF and links libtiff into the R package load path.

Constraint: User requested local rattler validation of the packaging pipeline
Rejected: Rely on CMake's tttrlibR target alone | R CMD INSTALL relinks the package from the static core and must carry TIFF itself
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep Python-internal TIFF SWIG names underscored only outside SWIGR; R-generated wrappers cannot reference leading-underscore symbols
Tested: rattler-build build --recipe recipes/py --variant python=3.11 --channel conda-forge --output-dir ./conda-bld --test native --log-style plain
Tested: rattler-build build --recipe recipes/r --channel conda-forge --output-dir ./conda-bld --test native --log-style plain
Tested: rattler-build build --render-only --with-solve for recipes/py, recipes/r, and recipes/docs
Not-tested: Linux docs package build because recipes/docs is skipped on local macOS

Author: tpeulen

ext/python/Tiff.i

@@ -32,8 +32,25 @@
 %include "TiffArrayIO.h"
 
 // One binding entry point per pixel type - the six concrete instantiations of
-// the single read_tiff/write_tiff template. Named with a leading underscore:
-// these are internal plumbing, users call imread()/imwrite().
+// the single read_tiff/write_tiff template. Python names them with a leading
+// underscore because users call imread()/imwrite(); R cannot parse generated
+// wrapper references to symbols starting with "_" (for example "f <- _name"),
+// so use R-safe names there.
+#ifdef SWIGR
+%template(tiff_read_u8)   tttrlib::read_tiff<unsigned char>;
+%template(tiff_read_u16)  tttrlib::read_tiff<unsigned short>;
+%template(tiff_read_u32)  tttrlib::read_tiff<unsigned int>;
+%template(tiff_read_i32)  tttrlib::read_tiff<int>;
+%template(tiff_read_f32)  tttrlib::read_tiff<float>;
+%template(tiff_read_f64)  tttrlib::read_tiff<double>;
+
+%template(tiff_write_u8)  tttrlib::write_tiff<unsigned char>;
+%template(tiff_write_u16) tttrlib::write_tiff<unsigned short>;
+%template(tiff_write_u32) tttrlib::write_tiff<unsigned int>;
+%template(tiff_write_i32) tttrlib::write_tiff<int>;
+%template(tiff_write_f32) tttrlib::write_tiff<float>;
+%template(tiff_write_f64) tttrlib::write_tiff<double>;
+#else
 %template(_tiff_read_u8)   tttrlib::read_tiff<unsigned char>;
 %template(_tiff_read_u16)  tttrlib::read_tiff<unsigned short>;
 %template(_tiff_read_u32)  tttrlib::read_tiff<unsigned int>;
@@ -47,6 +64,7 @@
 %template(_tiff_write_i32) tttrlib::write_tiff<int>;
 %template(_tiff_write_f32) tttrlib::write_tiff<float>;
 %template(_tiff_write_f64) tttrlib::write_tiff<double>;
+#endif
 
 // ---- Single, auto-dispatching user interface (Python) -----------------------
 #ifdef SWIGPYTHON

recipes/py/recipe.yaml

@@ -8,7 +8,7 @@ package:
   version: ${{ version }}
 
 source:
-  path: ..
+  path: ../..
 
 build:
   number: 1

recipes/r/build.sh

@@ -15,6 +15,8 @@ cmake -S .. -B . \
   -DBUILD_R_INTERFACE=ON \
   -DBUILD_LIBRARY=ON \
   -DWITH_AVX=OFF \
+  -DWITH_TIFF=ON \
+  -DWITH_TIFF_SYSTEM=ON \
   -DCMAKE_BUILD_TYPE=Release \
   -G Ninja
 ninja tttrlibR tttrlibStatic -j "${CPU_COUNT}"
@@ -39,7 +41,7 @@ INCDIRS="-I${ROOT}/include -I${ROOT}/src -I${ROOT}/thirdparty -I${ROOT}/thirdpar
 sed -e "s|@TTTRLIB_INCLUDE@|${ROOT}|g" \
     -e "s|@HDF5_CFLAGS@|${INCDIRS}|g" \
     -e "s|@TTTRLIB_LIBS@|${STATIC}|g" \
-    -e "s|@HDF5_LIBS@|-L${PREFIX}/lib -lhdf5|g" \
+    -e "s|@HDF5_LIBS@|-L${PREFIX}/lib -lhdf5 -ltiff|g" \
     ext/r/pkg/src/Makevars.in > ext/r/pkg/src/Makevars
 rm -f ext/r/pkg/src/Makevars.in
 printf 'CXX_STD = CXX17\n' >> ext/r/pkg/src/Makevars

recipes/r/recipe.yaml

@@ -29,6 +29,7 @@ requirements:
     # CHARACTER_POINTER); pin to R 4.4.x, matching the CI R test.
     - r-base >=4.4,<4.5
     - hdf5
+    - libtiff
     - highfive
     - nlohmann_json
     - if: osx
@@ -38,6 +39,7 @@ requirements:
   run:
     - r-base >=4.4,<4.5   # keep in sync with the host pin above
     - hdf5
+    - libtiff
     - if: osx
       then: llvm-openmp
     - if: linux