CI: resolve failures and various improvements (#2426)

* Simplify CI workflow

* CI: upgrade Ubuntu's Clang version to 12

* CI: upgrade macOS runner to version 11 (Big Sur)

* CI: temporarily disable the M1 runner

* CI: output test suite log upon failure

* CI: avoid brew update/upgrade steps

Since it may take a long time.

* CI: all jobs are supposed to succeed

* Fix test_descriptors.c failure after f8c2a36

Use a RANDOM image to create many crops from one source.

.github/workflows/ci.yml

@@ -6,54 +6,60 @@ jobs:
   CI:
     name: ${{ matrix.name }}
     runs-on: ${{ matrix.os }}
-    continue-on-error: ${{ contains(matrix.os, 'macos') }}
     strategy:
       fail-fast: false
       matrix:
-        name: [ "Linux x64 (Ubuntu 20.04) - GCC 10" ]
-        os: [ ubuntu-20.04 ]
-        sanitize: [ false ]
-        build:
-          - { cc: gcc, cxx: g++, linker: ld, shell: bash }
         include:
-          - name: "Linux x64 (Ubuntu 20.04) - Clang 10 with ASan and UBSan"
+          - name: "Linux x64 (Ubuntu 20.04) - GCC 10"
             os: ubuntu-20.04
-            sanitize: true
+            build: { cc: gcc, cxx: g++, linker: ld }
-            build: { cc: clang-10, cxx: clang++-10, linker: ld.lld-10, shell: bash }
+            shell: bash
-          - name: "macOS (10.15) - Xcode 12.3"
+
-            os: macos-10.15
+          - name: "Linux x64 (Ubuntu 20.04) - Clang 12 with ASan and UBSan"
-            sanitize: false
+            os: ubuntu-20.04
-            build: { cc: clang, cxx: clang++, linker: ld.lld, shell: bash }
+            build: { cc: clang-12, cxx: clang++-12, linker: ld.lld-12, sanitize: true }
-          - name: "macOS (10.15) - Xcode 12.3 - M1"
+            shell: bash
-            os: macos-m1
+
-            sanitize: false
+          - name: "macOS (11.5) - Xcode 12.5.1"
-            build: { cc: clang, cxx: clang++, linker: ld.lld, shell: "/usr/bin/arch -arch arm64e /bin/bash -l {0}" }
+            os: macos-11
+            build: { cc: clang, cxx: clang++, linker: ld.lld }
+            shell: bash
+
+          # TODO: Re-enable self-hosted M1 runner provided by MacStadium
+          #- name: "macOS (10.15) - Xcode 12.4 - M1"
+          #  os: macos-m1
+          #  build: { cc: clang, cxx: clang++, linker: ld.lld }
+          #  shell: "/usr/bin/arch -arch arm64e /bin/bash -l {0}"
 
     defaults:
       run:
-        shell: ${{ matrix.build.shell }} 
+        shell: ${{ matrix.shell }}
+
+    env:
+      CC: ${{ matrix.build.cc }}
+      CXX: ${{ matrix.build.cxx }}
+      LD: ${{ matrix.build.linker }}
+      CPPFLAGS: -Wall
+      DEBIAN_FRONTEND: noninteractive
+      HOMEBREW_NO_AUTO_UPDATE: 1
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
 
       - name: Update apt
-        if: contains(matrix.os, 'ubuntu')
+        if: runner.os == 'Linux'
-        env:
-          DEBIAN_FRONTEND: noninteractive
         run: sudo -E apt-get update -qq -o Acquire::Retries=3
 
       - name: Add Ubuntu PPAs
-        if: contains(matrix.os, 'ubuntu')
+        if: runner.os == 'Linux'
         run: |
           sudo add-apt-repository ppa:strukturag/libde265
           sudo add-apt-repository ppa:strukturag/libheif
           sudo add-apt-repository ppa:lovell/cgif
 
       - name: Install Ubuntu dependencies
-        if: contains(matrix.os, 'ubuntu')
+        if: runner.os == 'Linux'
-        env:
-          DEBIAN_FRONTEND: noninteractive
         run:
           sudo -E apt-get install --fix-missing -qq -o Acquire::Retries=3
             gtk-doc-tools gobject-introspection
@@ -68,44 +74,33 @@ jobs:
             libopenjp2-7-dev libimagequant-dev libcgif-dev
 
       - name: Install macOS dependencies
-        if: contains(matrix.os, 'macos')
+        if: runner.os == 'macOS'
         run: |
-          brew update
-          brew upgrade
           brew install autoconf automake libtool fftw fontconfig gtk-doc gobject-introspection glib libexif libgsf little-cms2 orc pango
           brew install cfitsio libheif libimagequant libjpeg-turbo libmatio librsvg libspng libtiff openexr openjpeg openslide poppler webp
           brew tap lovell/cgif-packaging https://github.com/lovell/cgif-packaging.git
           brew install --build-bottle lovell/cgif-packaging/cgif
 
-      - name: Install Clang 10
+      - name: Install Clang 12
-        env:
+        if: runner.os == 'Linux' && matrix.build.cc == 'clang-12'
-          DEBIAN_FRONTEND: noninteractive
-        if: contains(matrix.os, 'ubuntu') && matrix.build.cc == 'clang-10'
         run:
           sudo -E apt-get install --fix-missing -qq -o Acquire::Retries=3
-            clang-10 libomp-10-dev lld-10 llvm-10
+            clang-12 libomp-12-dev lld-12 llvm-12
-
-      - name: Prepare build environment
-        run: |
-          echo "CC=${{ matrix.build.cc }}" >> $GITHUB_ENV
-          echo "CXX=${{ matrix.build.cxx }}" >> $GITHUB_ENV
-          echo "LD=${{ matrix.build.linker }}" >> $GITHUB_ENV
-          echo "CPPFLAGS=-Wall" >> $GITHUB_ENV
 
       - name: Prepare Ubuntu environment
-        if: contains(matrix.os, 'ubuntu')
+        if: runner.os == 'Linux'
         run: echo "JOBS=$(nproc)" >> $GITHUB_ENV
 
       - name: Prepare macOS environment
-        if: contains(matrix.os, 'macos')
+        if: runner.os == 'macOS'
         run: |
           echo "JOBS=$(sysctl -n hw.logicalcpu)" >> $GITHUB_ENV
-          echo "PKG_CONFIG_PATH=/usr/local/opt/jpeg-turbo/lib/pkgconfig:/usr/local/opt/libxml2/lib/pkgconfig:/usr/local/opt/imagemagick@6/lib/pkgconfig" >> $GITHUB_ENV
+          echo "PKG_CONFIG_PATH=$(brew --prefix jpeg-turbo)/lib/pkgconfig:$(brew --prefix libxml2)/lib/pkgconfig:$PKG_CONFIG_PATH" >> $GITHUB_ENV
 
       - name: Prepare sanitizers
-        if: matrix.sanitize
+        if: matrix.build.sanitize
         env:
-          LLVM_PREFIX: /usr/lib/llvm-10
+          LLVM_PREFIX: /usr/lib/llvm-12
         run: |
           ASAN_DSO=`$CC -print-file-name=libclang_rt.asan-x86_64.so`
           echo "LDSHARED=$CC -shared" >> $GITHUB_ENV
@@ -133,13 +128,13 @@ jobs:
         run: make V=0 -j$JOBS
 
       - name: Check libvips
-        run: make V=0 check
+        run: make V=0 check || (cat test/test-suite.log && exit 1)
 
       - name: Install libvips
         run: sudo make V=0 install
 
       - name: Rebuild the shared library cache
-        if: contains(matrix.os, 'ubuntu')
+        if: runner.os == 'Linux'
         run: sudo ldconfig
 
       - name: Install pyvips

test/test_descriptors.c

@@ -56,11 +56,11 @@ main( int argc, char **argv )
 
 	/* Opening an image should read the header, then close the fd.
 	 */
-	printf( "** seq open ..\n" );
+	printf( "** rand open ..\n" );
 	if( !(source = vips_source_new_from_file( argv[1] )) )
 		vips_error_exit( NULL );
 	if( !(image = vips_image_new_from_source( source, "",
-		"access", VIPS_ACCESS_SEQUENTIAL,
+		"access", VIPS_ACCESS_RANDOM,
 		NULL )) )
 		vips_error_exit( NULL );
 	if( count_files( fd_dir ) != n_files )