Merge pull request #175 from fastfloat/dlemire/broader_alpine

Trying to extend alpine CI to more systems and fixing legacy issue (x86)

.github/workflows/alpine.yml

@@ -1,27 +1,47 @@
 name: Alpine Linux
-'on':
+on:
   - push
   - pull_request
+
 jobs:
-  ubuntu-build:
+  build:
+    name: Build on Alpine ${{ matrix.arch }}
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        arch:
+          - x86_64
+          - x86
+          - aarch64
+          - armv7
+          - ppc64le
+          - riscv64
     steps:
-      - uses: actions/checkout@v3
-      - name: start docker
+      - name: Checkout repository
+        uses: actions/checkout@v1
+
+      - name: Install latest Alpine Linux for ${{ matrix.arch }}
+        uses: jirutka/setup-alpine@v1
+        with:
+          arch: ${{ matrix.arch }}
+          branch: ${{ matrix.arch == 'riscv64' && 'edge' || 'latest-stable' }}
+          packages: >
+            build-base
+            cmake
+            g++
+            linux-headers
+            git
+            bash
+            build-base
+      - name: Prepare
         run: |
-          docker run -w /src -dit --name alpine -v $PWD:/src alpine:latest
-          echo 'docker exec alpine "$@";' > ./alpine.sh
-          chmod +x ./alpine.sh
-      - name: install packages
+          cmake -DFASTFLOAT_TEST=ON -B build
+        shell: alpine.sh {0}
+      - name: Build
         run: |
-          ./alpine.sh apk update
-          ./alpine.sh apk add build-base cmake g++ linux-headers git bash
-      - name: cmake
+          cmake --build build
+        shell: alpine.sh {0}
+      - name: Test
         run: |
-          ./alpine.sh cmake -DFASTFLOAT_TEST=ON  -B build_for_alpine
-      - name: build
-        run: |
-          ./alpine.sh cmake --build build_for_alpine
-      - name: test
-        run: |
-          ./alpine.sh bash -c "cd build_for_alpine && ctest  -R basictest"
+          ctest --test-dir build -R basictest
+        shell: alpine.sh {0}

include/fast_float/parse_number.h

@@ -66,6 +66,10 @@ from_chars_result parse_infnan(const char *first, const char *last, T &value)  n
  * Credit : @mwalcott3
  */
 fastfloat_really_inline bool rounds_to_nearest() noexcept {
+  // https://lemire.me/blog/2020/06/26/gcc-not-nearest/
+#if (FLT_EVAL_METHOD != 1) && (FLT_EVAL_METHOD != 0)
+  return false;
+#endif
   // See
   // A fast function to check your floating-point rounding mode
   // https://lemire.me/blog/2022/11/16/a-fast-function-to-check-your-floating-point-rounding-mode/

tests/basictest.cpp

@@ -132,7 +132,9 @@ TEST_CASE("rounds_to_nearest") {
   fesetround(FE_TONEAREST);
   std::cout << "FE_TONEAREST: fmin + 1.0f = " << iHexAndDec(fmin + 1.0f) << " 1.0f - fmin = " << iHexAndDec(1.0f - fmin) << std::endl;
   CHECK(fegetround() == FE_TONEAREST);
+#if (FLT_EVAL_METHOD == 1) || (FLT_EVAL_METHOD == 0)
   CHECK(fast_float::detail::rounds_to_nearest() == true);
+#endif
 }
 
 TEST_CASE("parse_zero") {