add mac gcc builds [ci skip]

vszakats · vszakats · commit f5c58d7fef78 · 2024-07-12T12:48:02.000+02:00
This became possible after working around a list of toolchain and curl issues, within curl itself. Then figuring out why gcc became inherently incompatible with Apple SDKs, and implementing the necessary toolchain fix in this repo too. Mac gcc builds are rather a tech demo and test bed, and it doesn't seem to support cross-CPU builds, multi-arch builds. Ref: curl/curl#14097
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -590,6 +590,34 @@ jobs:
             *-*-macos*.*
             urls.txt
 
+  mac-gcc:
+    runs-on: macos-latest
+    timeout-minutes: 30
+    env:
+      CW_JOBS: '4'
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: '300'
+      - name: 'build'
+        env:
+          GITHUB_TOKEN: '${{ github.token }}'
+        run: |
+          export CW_CCSUFFIX='-14'
+          export CW_CONFIG='${{ github.ref_name }}-mac-gcc-a64'
+          export CW_REVISION='${{ github.sha }}'
+          sh -c ./_ci-mac-homebrew.sh
+
+      - name: 'list dependencies'
+        run: cat urls.txt
+      - uses: actions/upload-artifact@v4
+        with:
+          name: 'curl-macos-gcc-arm64'
+          retention-days: 5
+          path: |
+            *-*-macos*.*
+            urls.txt
+
   win-llvm-from-mac:
     runs-on: macos-latest
     timeout-minutes: 30
diff --git a/_build.sh b/_build.sh
@@ -848,7 +848,9 @@ build_single_target() {
     _OSVER="$(printf '%02d%02d' \
       "$(printf '%s' "${macminver}" | cut -d '.' -f 1)" \
       "$(printf '%s' "${macminver}" | cut -d '.' -f 2)")"
-    _CMAKE_GLOBAL+=" -DCMAKE_OSX_ARCHITECTURES=${_machines}"
+    if [ "${_CC}" != 'gcc' ]; then
+      _CMAKE_GLOBAL+=" -DCMAKE_OSX_ARCHITECTURES=${_machines}"
+    fi
   elif [ "${_OS}" = 'linux' ]; then
     if [ "${_HOST}" != "${_OS}" ] || \
        [ "${unamem}" != "${_machine}" ]; then
@@ -1190,15 +1192,39 @@ build_single_target() {
 
     # Explicitly set the SDK root.
     # We set it for all build tools for macOS to gain control over this.
-    _SYSROOT="$(xcrun -sdk macosx --show-sdk-path)"  # E.g. /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
+    _SYSROOT="$(xcrun -sdk macosx --show-sdk-path 2>/dev/null)"  # E.g. /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
+
+    # Installed/selected Xcode version and SDK version:
+    xcodebuild -version || true
+    xcrun -sdk macosx --show-sdk-path || true
 
-    # Standard gcc (as of v13.2.0 and v14.1.0) fails to compile some headers in macOS SDK 13.x.
-    # Issue: https://github.com/curl/curl/issues/10356
-    # Revert to SDK 12.x as a workaround, e.g. /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk
     if [ "${_CC}" = 'gcc' ]; then
-      tmp="$(echo "${_SYSROOT}" | sed -E 's/[0-9\.]+\.sdk$/12.sdk/g')"
-      if [ -d "${tmp}" ]; then
-        _SYSROOT="${tmp}"
+
+      libgccdir="$(dirname \
+        "$("${_CCPREFIX}gcc${_CCSUFFIX}" -print-libgcc-file-name)")"
+
+      if [ -d "${libgccdir}/include-fixed" ]; then
+        # dump SDK major version used while building Homebrew gcc:
+        grep -a -h -r -E -o '.+[0-9.]+\.sdk/' "${libgccdir}/include-fixed" | sed -E 's/^\t+//g' | tr -d '"' | sort -u || true
+
+        # Homebrew gcc (as of v14.1.0) ships with set of SDK header overrides.
+        # These are compatible with the specific SDK version the Homebrew build
+        # machines used at build-time. We only know the major version number of
+        # that SDK, and there is no guarantee that ours (or the CI machine) has
+        # the same versions installed or selected. To make it work anyway, we
+        # zap known to be incompatible/problematic parts of the gcc hacks.
+
+        # Unbreak Homebrew gcc builds by moving problematic SDK header overlay
+        # directories/files out of the way:
+        find "${libgccdir}/include-fixed" | sort
+        patch_out='dispatch os AvailabilityInternal.h'
+        patch_out+=' stdio.h'  # for Xcode 16 error: unknown type name 'FILE'
+        for f in ${patch_out}; do
+          if [ -r "${libgccdir}/include-fixed/${f}" ]; then
+            echo "! Zap gcc hack: '${libgccdir}/include-fixed/${f}'"
+            mv "${libgccdir}/include-fixed/${f}" "${libgccdir}/include-fixed/${f}-BAK"
+          fi
+        done
       fi
     fi
 
