Merge from my "master" branch

.github/CONTRIBUTING.md

@@ -0,0 +1,18 @@
+## Contributing to GCC
+
+Thanks for taking the time to contribute to GCC! Please be advised that if you are
+viewing this on `github.com`, that the mirror there is unofficial and unmonitored.
+The GCC community does not use `github.com` for their contributions. Instead, we use
+a mailing list (`[email protected]`) for code submissions, code
+reviews, and bug reports.
+
+Perhaps one day it will be possible to use [GitGitGadget](https://gitgitgadget.github.io/) to
+conveniently send Pull Requests commits to GCC's mailing list, the way that the Git project currently allows it to be used to send PRs to their mailing list, but until that day arrives, please send your patches to the mailing list manually.
+
+Please read ["Contributing to GCC"](https://gcc.gnu.org/contribute.html) on the main GCC website
+to learn how the GCC project is managed, and how you can work with it.
+In addition, we highly recommend you to read [our guidelines for read-write Git access](https://gcc.gnu.org/gitwrite.html).
+
+Or, you can follow the ["Contributing to GCC in 10 easy steps"](https://gcc.gnu.org/wiki/GettingStarted#Basics:_Contributing_to_GCC_in_10_easy_steps) section of the ["Getting Started" page](https://gcc.gnu.org/wiki/GettingStarted) on [the wiki](https://gcc.gnu.org/wiki) for another example of the contribution process.
+
+Your friendly GCC community!

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,5 @@
+Thanks for taking the time to contribute to GCC! Please be advised that if you are
+viewing this on `github.com`, that the mirror there is unofficial and unmonitored.
+The GCC community does not use `github.com` for their contributions. Instead, we use
+a mailing list (`[email protected]`) for code submissions, code reviews, and
+bug reports. Please send patches there instead.

.github/dependabot.yml

@@ -0,0 +1,11 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"

.github/workflows/linux.yaml

@@ -3,14 +3,14 @@ on:
   push:
     branches: 
       - master
+      - me/*
       - releases/gcc-*
     tags:
       - releases/gcc-*
   pull_request:
     branches: 
       - master
-      - releases/gcc-*
-    tags:
+      - me/*
       - releases/gcc-*
 
 concurrency:
@@ -21,6 +21,7 @@ jobs:
   build:
     name: ${{ matrix.name }}-build
     runs-on: ubuntu-latest
+    timeout-minutes: 720
     strategy:
       matrix:
         include:
@@ -29,85 +30,158 @@ jobs:
 
       fail-fast: false
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 2
 
       - name: Install dependencies
         run: |
           sudo apt-get -qq update
-          sudo apt install -y gcc-multilib build-essential flex zlib1g-dev gnat gdc
+          sudo apt install -y gcc-multilib build-essential flex zlib1g-dev gnat gdc expect dejagnu libc-dev libc-devtools texlive findutils binutils autogen gettext autopoint libasprintf-dev libgettextpo-dev mailutils mailutils-mh procmail emacs exim4-base msmtp bsd-mailx
 
       - name: Install dependencies for aarch64
         if: success() && contains(matrix.target, 'aarch64')
         run: |
           sudo apt-get -y install gcc-aarch64-linux-gnu g++-aarch64-linux-gnu binutils-aarch64-linux-gnu
 
+      - name: Stamp
+        if: success()
+        env:
+          revision: ${{ github.head_ref }}
+        run: |
+          if test -z "${revision}"; then revision=0; fi
+          {
+              date
+              echo "$(TZ=UTC date) (revision ${revision})"
+          } > LAST_UPDATED
+
+      - name: Cache
+        id: cache-deps
+        uses: actions/cache@v3
+        env:
+          cache-name: cache-downloaded-prerequisites
+        with:
+          path: ../build
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('LAST_UPDATED') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+            ${{ runner.os }}-build-
+            ${{ runner.os }}-
+
       - name: Download prerequisites
         if: success()
         run: |
-          ./contrib/download_prerequisites    
+          ./contrib/download_prerequisites
+          ls
 
       - name: Configure x86_64
         if: success() && matrix.target == 'x86_64'
         run: |
-          unset ADA_INCLUDE_PATH
-          unset ADA_OBJECT_PATH
+          if test -n "${ADA_INCLUDE_PATH}"; then unset ADA_INCLUDE_PATH; fi
+          if test -n "${ADA_OBJECT_PATH}"; then unset ADA_OBJECT_PATH; fi
           cd ../
-          mkdir build
+          if test ! -d build; then mkdir build; fi
           cd build
           ../gcc/configure \
-                --enable-languages=c,c++,go,d,fortran,objc,obj-c++,m2 \
+                --enable-languages=c,c++,lto,objc,obj-c++ \
                 --prefix=/usr \
                 --with-gcc-major-version-only \
                 --program-prefix=x86_64-linux-gnu- \
-                --enable-shared \
-                --enable-linker-build-id \
                 --libexecdir=/usr/lib \
                 --without-included-gettext \
                 --enable-threads=posix \
                 --libdir=/usr/lib \
-                --enable-nls \
-                --enable-clocale=gnu \
-                --enable-libstdcxx-debug \
-                --enable-libstdcxx-time=yes \
-                --with-default-libstdcxx-abi=new \
-                --enable-gnu-unique-object \
                 --disable-vtable-verify \
-                --enable-plugin \
-                --enable-default-pie \
                 --with-system-zlib \
                 --with-target-system-zlib=auto \
-                --enable-objc-gc=auto \
-                --enable-multiarch \
+                --disable-bootstrap \
                 --disable-werror \
-                --with-arch-32=i686 \
-                --with-abi=m64 \
-                --with-multilib-list=m32,m64,mx32 \
-                --enable-multilib \
                 --with-tune=generic \
                 --without-cuda-driver \
                 --enable-checking=release \
+                --enable-silent-rules \
                 --build=x86_64-linux-gnu \
                 --host=x86_64-linux-gnu \
                 --target=x86_64-linux-gnu
 
-      - name: Make bootstrap
+      - name: Make
         if: success()
         run: |
           cd ../build
-          make bootstrap -j$(nproc)
+          if test -x "$(which nproc)"; then echo "nproc says that we can use $(nproc) build jobs"; else echo "error: missing nproc!" >&2 && exit 1; fi
+          time (make -j"$(nproc)" | tee build.log)
+          if test -e build.log; then stat build.log && wc -l build.log; fi
 
-      - name: Make install
+      - name: Debug failure
+        if: failure()
+        run: |
+          if test -r build.log; then grep -i "error:" build.log; \
+          elif test -r ../build/build.log; then grep -i "error:" ../build/build.log; \
+          elif test -e ../build/Makefile; then \
+            sudo apt install remake; \
+            cd ../build; \
+            remake -dpPw --trace=full; \
+          elif test -d ../build; then \
+            cd ../build && ls; \
+          else \
+            pwd && ls; \
+          fi
+
+      - name: Make docs (post-build)
+        if: success()
+        run: |
+          cd ../build
+          echo "make info" && (time make info) && find . -name "*.info" -print
+          echo "make dvi" && (time make dvi) && find . -name "*.dvi" -print
+          echo "make pdf" && (time make pdf) && find . -name "*.pdf" -print
+          echo "make html" && (time make html) && find . -name "*.html" -print
+
+      - name: Make install (plus docs)
         if: success()
         run: |
           cd ../build
           sudo make install
+          sudo make install-info
+          sudo make install-dvi
+          sudo make install-pdf
+          sudo make install-html
+          sudo make dir.info
 
       - name: Tests
         if: success()
         run: |
-          /usr/bin/x86_64-linux-gnu-gcc --version
-          /usr/bin/x86_64-linux-gnu-gcc -v
+          if test -x /usr/bin/x86_64-linux-gnu-gcc; then /usr/bin/x86_64-linux-gnu-gcc --version; elif test -x ../build/gcc/xgcc; then ../build/gcc/xgcc --version; fi
+          if test -x /usr/bin/x86_64-linux-gnu-gcc; then /usr/bin/x86_64-linux-gnu-gcc -v; elif test -x ../build/gcc/xgcc; then ../build/gcc/xgcc --v; fi
           cd ../build
-          make -k check
+          if test -e build.log; then make warning.log; fi
+          time (make -k -j"$(nproc)" check RUNTESTFLAGS="compile.exp dg-torture.exp execute.exp old-deja.exp" | tee testsuite_output.log)
+          if test -e warning.log; then make mail-report-with-warnings.log; else make mail-report.log; fi
+          if test -x "$(which Mail)"; then \
+            if test -x mail-report-with-warnings.log; then \
+              echo "attempting to send mail-report-with-warnings.log"; \
+              ./mail-report-with-warnings.log; \
+              stat mail-report-with-warnings.log; \
+            elif test -x mail-report.log; then \
+              echo "attempting to send mail-report.log"; \
+              ./mail-report.log; \
+              stat mail-report.log; \
+            elif test -e testsuite_output.log; then \
+              echo "TODO: figure out a way to send testsuite_output.log"; \
+            else \
+              echo "Nothing to send."; \
+            fi; \
+          else \
+            echo "Warning: \"Mail\" program is missing, so skipping emailing of testresults!"; \
+          fi
+
+      - name: Upload a Build Artifact
+        uses: actions/[email protected]
+        with:
+          # Artifact name
+          name: logfiles
+          # A file, directory or wildcard pattern that describes what to upload
+          path: |
+            *.log
+            build/*.log
+            path/*.log
+            testsuite/*.log