[impl] update c4core: add support for compilation from emscripten

see biojppm/c4core#52

.github/setenv.sh

@@ -34,6 +34,8 @@ function c4_show_info()
     echo "BM=$BM"
     echo "STD=$STD"
     echo "ARM=$ARM"
+    echo "LIBCXX=$LIBCXX"
+    echo "VERBOSE_MAKEFILES=$VERBOSE_MAKEFILES"
     which cmake
     cmake --version
     case "$CXX_" in
@@ -194,6 +196,9 @@ function c4_cfg_test()
         _addcmkflags -DC4_CXX_STANDARD=$STD
         _addprojflags CXX_STANDARD=$STD
     fi
+    if [ "$LIBCXX" != "" ] ; then
+        _addprojflags USE_LIBCXX=$LIBCXX
+    fi
     #
     if [ "$DEV" != "OFF" ] ; then
         _addprojflags DEV=ON
@@ -231,6 +236,9 @@ function c4_cfg_test()
         _addprojflags COVERAGE_CODECOV=ON COVERAGE_CODECOV_SILENT=ON
         _addprojflags COVERAGE_COVERALLS=ON COVERAGE_COVERALLS_SILENT=ON
     fi
+    if [ ! -z "$VERBOSE_MAKEFILES" ] ; then
+        _addcmkflags -DCMAKE_VERBOSE_MAKEFILES=$VERBOSE_MAKEFILES
+    fi
     _addcmkflags -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
     if [ ! -z "$CMAKE_FLAGS" ] ; then
         _addcmkflags $CMAKE_FLAGS
@@ -290,6 +298,10 @@ function c4_cfg_test()
                   -DCMAKE_C_FLAGS="-std=c99 -m$bits" -DCMAKE_CXX_FLAGS="-m$bits"
             cmake --build $build_dir --target help | sed 1d | sort
             ;;
+        em++)
+            emcmake cmake -S $PROJ_DIR -B $build_dir -DCMAKE_INSTALL_PREFIX="$install_dir" \
+                  -DCMAKE_BUILD_TYPE=$BT $CMFLAGS -DCMAKE_CXX_FLAGS="-s DISABLE_EXCEPTION_CATCHING=0"
+            ;;
         *)
             echo "unknown compiler"
             exit 1
@@ -359,7 +371,7 @@ function _c4_parallel_build_flags()
                 echo "-IDEBuildOperationMaxNumberOfConcurrentCompileTasks=$NUM_JOBS_BUILD"
             fi
             ;;
-        *g++*|*gcc*|*clang*)
+        *g++*|*gcc*|*clang*|em++)
             if [ -z "$NUM_JOBS_BUILD" ] ; then
                 echo "-j $(nproc)"
             else
@@ -386,7 +398,7 @@ function _c4_generator_build_flags()
             # https://stackoverflow.com/questions/51153525/xcode-10-unable-to-attach-db-error
             echo "-UseModernBuildSystem=NO"
             ;;
-        *g++*|*gcc*|*clang*)
+        *g++*|*gcc*|*clang*|em++)
             ;;
         "") # allow empty compiler
             ;;

.github/workflows/emscripten.yml

@@ -0,0 +1,69 @@
+name: emscripten
+
+defaults:
+  #if: "!contains(github.event.head_commit.message, 'skip ci')"  # SKIP
+  run:
+    # Use a bash shell so we can use the same syntax for environment variable
+    # access regardless of the host operating system
+    shell: bash -e -x {0}
+
+on:
+  # https://github.community/t/how-to-trigger-an-action-on-push-or-pull-request-but-not-both/16662
+  workflow_dispatch:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+
+env:
+  PROJ_PFX_TARGET: ryml-
+  PROJ_PFX_CMAKE: RYML_
+  CMAKE_FLAGS:
+  NUM_JOBS_BUILD: # 4
+  EMSCRIPTEN_CACHE_FOLDER: 'emsdk-cache'
+
+jobs:
+
+  #----------------------------------------------------------------------------
+  emscripten:
+    name: emscripten/${{matrix.emver}}/c++${{matrix.std}}/${{matrix.bt}}
+    continue-on-error: true
+    if: always()  # https://stackoverflow.com/questions/62045967/github-actions-is-there-a-way-to-continue-on-error-while-still-getting-correct
+    runs-on: ${{matrix.os}}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - {std: 11, cxx: em++, emver: 2.0.34, bt: Debug  , os: ubuntu-latest, bitlinks: static32}
+          - {std: 11, cxx: em++, emver: 2.0.34, bt: Release, os: ubuntu-latest, bitlinks: static32}
+          - {std: 20, cxx: em++, emver: 2.0.34, bt: Debug  , os: ubuntu-latest, bitlinks: static32}
+          - {std: 20, cxx: em++, emver: 2.0.34, bt: Release, os: ubuntu-latest, bitlinks: static32}
+          - {std: 11, cxx: em++, emver: 3.0.0 , bt: Debug  , os: ubuntu-latest, bitlinks: static32}
+          - {std: 11, cxx: em++, emver: 3.0.0 , bt: Release, os: ubuntu-latest, bitlinks: static32}
+          - {std: 20, cxx: em++, emver: 3.0.0 , bt: Debug  , os: ubuntu-latest, bitlinks: static32}
+          - {std: 20, cxx: em++, emver: 3.0.0 , bt: Release, os: ubuntu-latest, bitlinks: static32}
+    env:
+      STD: "${{matrix.std}}"
+      CXX_: "${{matrix.cxx}}"
+      BT: "${{matrix.bt}}"
+      BITLINKS: "${{matrix.bitlinks}}"
+      VG: "${{matrix.vg}}"
+      SAN: "${{matrix.san}}"
+      LINT: "${{matrix.lint}}"
+      OS: "${{matrix.os}}"
+    steps:
+      - {name: checkout, uses: actions/checkout@v2, with: {submodules: recursive}}
+      - name: setup emscripten cache
+        id: cache-system-libraries
+        uses: actions/cache@v2
+        with: {path: "${{env.EMSCRIPTEN_CACHE_FOLDER}}", key: "${{matrix.emver}}-${{runner.os}}"}
+      - name: setup emscripten
+        uses: mymindstorm/setup-emsdk@v11
+        with: {version: "${{matrix.emver}}", actions-cache-folder: "${{env.EMSCRIPTEN_CACHE_FOLDER}}"}
+      - {name: show info, run: source .github/setenv.sh && c4_show_info}
+      - name: static32-configure---------------------------------------------------
+        run: source .github/setenv.sh && c4_cfg_test static32
+      - {name: static32-build, run: source .github/setenv.sh && c4_build_test static32}
+      - {name: static32-run, run: source .github/setenv.sh && c4_run_test static32}

README.md

@@ -43,9 +43,9 @@ ryml is written in C++11, and compiles cleanly with:
 * Intel Compiler
 
 ryml is [extensively unit-tested in Linux, Windows and
-MacOS](https://github.com/biojppm/rapidyaml/actions). The
-tests cover x64, x86, arm, aarch64, ppc64le and s390x architectures,
-and include analysing ryml with:
+MacOS](https://github.com/biojppm/rapidyaml/actions). The tests cover
+x64, x86, arm, wasm (emscripten), aarch64, ppc64le and s390x
+architectures, and include analysing ryml with:
   * valgrind
   * clang-tidy
   * clang sanitizers:

changelog/current.md

@@ -10,6 +10,7 @@
   Tree expected = parse("{keyval0: val0, keyval1: {}, keyval2: []}");
   assert(emitrs<std::string>(t) == emitrs<std::string>(expected));
   ```
+- Add support for compilation with emscripten (WebAssembly+javascript) ([PR #173](https://github.com/biojppm/rapidyaml/pull/173)).
 
 ### Fixes
 

samples/quickstart.cpp

@@ -2320,8 +2320,10 @@ void sample_formatting()
         // AKA %a (hexadecimal formatting of floats)
         CHECK("0x1.e8480p+19" == cat_sub(buf, fmt::real(1000000.000000000, 5, FTOA_HEXA)));   // AKA %a
         CHECK("0x1.2d53ap+20" == cat_sub(buf, fmt::real(1234234.234234234, 5, FTOA_HEXA)));   // AKA %a
+                    std::cout << cat_sub(buf, fmt::real(1234234.234234234, 4, FTOA_HEXA)) << "\n";   // AKA %a
         CHECK("0x1.2d54p+20"  == cat_sub(buf, fmt::real(1234234.234234234, 4, FTOA_HEXA)));   // AKA %a
         CHECK("0x1.2d5p+20"   == cat_sub(buf, fmt::real(1234234.234234234, 3, FTOA_HEXA)));   // AKA %a
+                    std::cout << cat_sub(buf, fmt::real(1234234.234234234, 2, FTOA_HEXA)) << "\n";   // AKA %a
         CHECK("0x1.2dp+20"    == cat_sub(buf, fmt::real(1234234.234234234, 2, FTOA_HEXA)));   // AKA %a
 
         // --------------------------------------------------------------