dist: enable libbacktrace on ARM and ARM64

(and make sure it will work on Windows, when enabled)

docker/dist/entry_point.sh

@@ -32,23 +32,37 @@ if [[ "${PLATFORM}" == "Windows_amd64" ]]; then
     deps-common build/generate_makefile
   # This can be reduced to `make CC=... ...` when it becomes possible to
   # replace `CC=gcc` with `CC=$(CC)` in "vendor/nimbus-build-system/makefiles/targets.mk".
+  CC=x86_64-w64-mingw32.static-gcc
+  CXX=x86_64-w64-mingw32.static-g++
   make \
     -j$(nproc) \
     -C vendor/nim-nat-traversal/vendor/miniupnp/miniupnpc \
     -f Makefile.mingw \
-    CC=x86_64-w64-mingw32.static-gcc \
+    CC="${CC}" \
     libminiupnpc.a &>/dev/null
   make \
     -j$(nproc) \
     -C vendor/nim-nat-traversal/vendor/libnatpmp-upstream \
-    CC=x86_64-w64-mingw32.static-gcc \
+    CC="${CC}" \
     CFLAGS="-Wall -Os -DWIN32 -DNATPMP_STATICLIB -DENABLE_STRNATPMPERR -DNATPMP_MAX_RETRIES=4 ${CFLAGS}" \
     libnatpmp.a &>/dev/null
+  # We set CXX and add CXXFLAGS for libunwind's C++ code, even though we don't
+  # use those C++ objects. I don't see an easy way of disabling the C++ parts in
+  # libunwind itself.
+  #
+  # "libunwind.a" combines objects produced from C and C++ code. Even though we
+  # don't link any C++-generated objects, the linker still checks them for
+  # undefined symbols, so we're forced to use g++ as a linker wrapper.
+  # For some reason, macOS's Clang doesn't need this trick, nor do native (and
+  # newer) Mingw-w64 toolchains on Windows.
   make \
     -j$(nproc) \
-    USE_LIBBACKTRACE=0 \
+    CC="${CC}" \
+    CXX="${CXX}" \
+    CXXFLAGS="${CXXFLAGS} -D__STDC_FORMAT_MACROS -D_WIN32_WINNT=0x0600" \
+    USE_VENDORED_LIBUNWIND=1 \
     LOG_LEVEL="TRACE" \
-    NIMFLAGS="-d:disableMarchNative -d:chronicles_sinks=textlines -d:chronicles_colors=none --os:windows --gcc.exe=x86_64-w64-mingw32.static-gcc --gcc.linkerexe=x86_64-w64-mingw32.static-gcc --passL:-static" \
+    NIMFLAGS="-d:disableMarchNative -d:chronicles_sinks=textlines -d:chronicles_colors=none --os:windows --gcc.exe=${CC} --gcc.linkerexe=${CXX} --passL:-static" \
     ${BINARIES}
 elif [[ "${PLATFORM}" == "Linux_arm32v7" ]]; then
   CC="arm-linux-gnueabihf-gcc"
@@ -59,7 +73,6 @@ elif [[ "${PLATFORM}" == "Linux_arm32v7" ]]; then
     deps-common build/generate_makefile
   make \
     -j$(nproc) \
-    USE_LIBBACKTRACE=0 \
     LOG_LEVEL="TRACE" \
     CC="${CC}" \
     NIMFLAGS="-d:disableMarchNative -d:chronicles_sinks=textlines -d:chronicles_colors=none --cpu:arm --gcc.exe=${CC} --gcc.linkerexe=${CC}" \
@@ -74,7 +87,6 @@ elif [[ "${PLATFORM}" == "Linux_arm64v8" ]]; then
     deps-common build/generate_makefile
   make \
     -j$(nproc) \
-    USE_LIBBACKTRACE=0 \
     LOG_LEVEL="TRACE" \
     CC="${CC}" \
     NIMFLAGS="-d:disableMarchNative -d:chronicles_sinks=textlines -d:chronicles_colors=none --cpu:arm64 --gcc.exe=${CC} --gcc.linkerexe=${CC}" \

vendor/nim-libbacktrace

@@ -1 +1 @@
-Subproject commit 8121c08e0e7bdf92f86012b4af2330434fa7ed5d
+Subproject commit 40be35148e87747666c3afd78fa678079406eac7