add ppc toolchain description

Author: serge-sans-paille

.github/toolchains/gcc-powerpc-linux-gnu.cmake

@@ -0,0 +1,5 @@
+set(CMAKE_SYSTEM_PROCESSOR powerpc)
+set(triple powerpc-linux-gnu)
+
+include(${CMAKE_CURRENT_LIST_DIR}/gcc.cmake)
+

.github/workflows/cross.yml

@@ -1,4 +1,4 @@
-name: Arm cross-compilation build
+name: cross-compilation build
 on: [push, pull_request]
 concurrency:
   group: ${{ github.workflow }}-${{ github.job }}-${{ github.ref }}
@@ -10,10 +10,10 @@ jobs:
     strategy:
       matrix:
         target:
-          - { platform: 'arm',     arch: 'armv7-a', dir: 'arm-linux-gnueabihf', flags: '-mfpu=neon', full: 'ON'}
-          - { platform: 'arm',     arch: 'armv7-a', dir: 'arm-linux-gnueabihf', flags: '-mfpu=vfpv3-d16', full: 'OFF' } # no neon
-          - { platform: 'aarch64', arch: 'armv8-a', dir: 'aarch64-linux-gnu', flags: '', full: 'ON' }
-          - { platform: 'ppc', arch: 'powerpc', dir: 'powerpc-linux-gnu', flags: '-maltivec', full: 'OFF' }
+          - { platform: 'arm',     dir: 'arm-linux-gnueabihf', flags: '-march=armv7-a -mfpu=neon',      cmakeflags: '-DTARGET_ARCH=generic', full: 'ON'}
+          - { platform: 'arm',     dir: 'arm-linux-gnueabihf', flags: '-march=armv7-a -mfpu=vfpv3-d16', cmakeflags: '-DTARGET_ARCH=generic', full: 'OFF' } # no neon
+          - { platform: 'aarch64', dir: 'aarch64-linux-gnu',   flags: '-march=armv8-a',                 cmakeflags: '-DTARGET_ARCH=generic', full: 'ON' }
+          - { platform: 'ppc',     dir: 'powerpc-linux-gnu',   flags: '-maltivec',                      cmakeflags: '',                      full: 'OFF' }
         sys:
           - { compiler: 'gcc',   version: '10' }
     steps:
@@ -37,7 +37,7 @@ jobs:
     - name: Setup
       run: |
         mkdir _build
-        cd _build && cmake .. -DBUILD_TESTS=ON -DDOWNLOAD_DOCTEST=ON -DBUILD_BENCHMARK=${{ matrix.target.full }} -DBUILD_EXAMPLES=${{ matrix.target.full }} -DCMAKE_BUILD_TYPE=Release -DTARGET_ARCH=generic -DCMAKE_C_FLAGS="-march=${{ matrix.target.arch }} ${{ matrix.target.flags }}" -DCMAKE_CXX_FLAGS="-march=${{ matrix.target.arch }} ${{ matrix.target.flags }}" -DCMAKE_TOOLCHAIN_FILE=${{ github.workspace }}/.github/toolchains/${{ matrix.sys.compiler }}-${{ matrix.target.dir }}.cmake
+        cd _build && cmake .. -DBUILD_TESTS=ON -DDOWNLOAD_DOCTEST=ON -DBUILD_BENCHMARK=${{ matrix.target.full }} -DBUILD_EXAMPLES=${{ matrix.target.full }} -DCMAKE_BUILD_TYPE=Release ${{ matrix.target.cmakeflags }} -DCMAKE_C_FLAGS="${{ matrix.target.flags }}" -DCMAKE_CXX_FLAGS="${{ matrix.target.flags }}" -DCMAKE_TOOLCHAIN_FILE=${{ github.workspace }}/.github/toolchains/${{ matrix.sys.compiler }}-${{ matrix.target.dir }}.cmake
     - name: Build
       run: cmake --build _build
     - name: Testing xsimd