Fix install on debian-sid + clang-19 (#272)

* add sid to docker-compose

* reproducer

* add fix

Author: paleolimbot

docker-compose.yml

@@ -63,6 +63,16 @@ services:
     volumes:
       - .:/s2
 
+# CRAN incoming
+  debian-sid-clang:
+    build:
+      context: .
+      args:
+        - IMAGE=debian:sid
+      dockerfile: tools/docker/debian-clang.dockerfile
+    volumes:
+      - .:/s2
+
   # This is what CRAN runs
   fedora-36:
     build:

src/init.cpp

@@ -1,4 +1,5 @@
-
+#include "absl/base/config.h"
+#include "absl/log/log.h"
 #include "s2/s2debug.h"
 #include <Rcpp.h>
 using namespace Rcpp;
@@ -12,3 +13,36 @@ void cpp_s2_init() {
   // if there is another way to do so (e.g., constructing S2Loop and S2Polygon objects).
   absl::SetFlag(&FLAGS_s2debug, false);
 }
+
+// Work around bug linking to gcc-built abseil-cpp from clang-built s2
+// https://github.com/r-spatial/s2/issues/271
+// https://github.com/abseil/abseil-cpp/issues/1747#issuecomment-2325811064
+namespace absl {
+
+ABSL_NAMESPACE_BEGIN
+
+namespace log_internal {
+
+template LogMessage& LogMessage::operator<<(const char& v);
+template LogMessage& LogMessage::operator<<(const signed char& v);
+template LogMessage& LogMessage::operator<<(const unsigned char& v);
+template LogMessage& LogMessage::operator<<(const short& v);           // NOLINT
+template LogMessage& LogMessage::operator<<(const unsigned short& v);  // NOLINT
+template LogMessage& LogMessage::operator<<(const int& v);
+template LogMessage& LogMessage::operator<<(const unsigned int& v);
+template LogMessage& LogMessage::operator<<(const long& v);           // NOLINT
+template LogMessage& LogMessage::operator<<(const unsigned long& v);  // NOLINT
+template LogMessage& LogMessage::operator<<(const long long& v);      // NOLINT
+template LogMessage& LogMessage::operator<<(
+    const unsigned long long& v);  // NOLINT
+template LogMessage& LogMessage::operator<<(void* const& v);
+template LogMessage& LogMessage::operator<<(const void* const& v);
+template LogMessage& LogMessage::operator<<(const float& v);
+template LogMessage& LogMessage::operator<<(const double& v);
+template LogMessage& LogMessage::operator<<(const bool& v);
+
+}  // namespace log_internal
+
+ABSL_NAMESPACE_END
+
+}  // namespace absl

tools/docker/debian-clang.dockerfile

@@ -0,0 +1,24 @@
+
+ARG IMAGE=debian:testing
+
+FROM ${IMAGE}
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    r-base cmake libcurl4-openssl-dev libssl-dev clang-19
+
+# Not all versions of ubuntu/debian have libabsl-dev
+RUN apt-get install -y libabsl-dev || true
+
+# Make sure we can use all cores to install things
+RUN mkdir ~/.R && echo "MAKEFLAGS = -j$(nproc)" > ~/.R/Makevars
+
+# Use clang if that's what we're up to. Probably not complete
+# (e.g., doesn't consider C++11 or 14 or 20 or 23 compilers)
+RUN echo "CC=clang-19" >> ~/.R/Makevars
+RUN echo "CXX=clang++-19" >> ~/.R/Makevars
+RUN echo "CXX17=clang++-19" >> ~/.R/Makevars
+
+RUN R -e 'install.packages(c("wk", "bit64", "Rcpp", "testthat"), repos = "https://cloud.r-project.org")'
+
+CMD R CMD INSTALL /s2 --preclean && R -e 'testthat::test_local("/s2")'
+