From 739b05a3dd4ef97d07e0cbf1e02b828a52e04cb0 Mon Sep 17 00:00:00 2001
From: Dan Bonachea <dobonachea@lbl.gov>
Date: Fri, 19 Jun 2026 07:15:27 -0700
Subject: [PATCH 1/2] CI: Add coverage for GCC 16

---
 .github/workflows/build.yml | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 514ec1075..cbc61a99a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -60,7 +60,7 @@ jobs:
       matrix:
         os: [ macos-14, macos-15, macos-15-intel, macos-26, macos-26-intel, ubuntu-24.04 ]
         compiler: [ gcc ]
-        version: [ 12, 13, 14, 15 ]
+        version: [ 12, 13, 14, 15, 16 ]
         extra_flags: [ -g ]
 
         include:
@@ -163,7 +163,7 @@ jobs:
         sudo apt update
         #sudo apt list -a 'gcc-*'
         sudo apt install -y build-essential autoconf2.69 automake
-        if (( ${COMPILER_VERSION} < 15 )) ; then
+        if [[ ${COMPILER_VERSION} -lt 15 ]] ; then
           sudo apt install -y gcc-${COMPILER_VERSION}
         else
           curl -L https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh -o install-homebrew.sh
@@ -195,6 +195,9 @@ jobs:
         if [[ "${{ matrix.compiler }}@${{ matrix.version }}" == gcc@12 ]] ; then
           brew install gcc@12
         fi
+        if [[ ${{ matrix.compiler }} == 'gcc' && ${COMPILER_VERSION} -gt 15 ]] ; then
+          brew install gcc@${COMPILER_VERSION}
+        fi
 
     - name: Install LLVM on macOS
       if: contains(matrix.os, 'macos') && matrix.compiler == 'clang'

From 656b409cb7964226842031667d3adc12ef1d6b49 Mon Sep 17 00:00:00 2001
From: Dan Bonachea <dobonachea@lbl.gov>
Date: Fri, 19 Jun 2026 05:25:25 -0700
Subject: [PATCH 2/2] CI: silence Homebrew tap trust and Linux sandbox warnings

---
 .github/workflows/build.yml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index cbc61a99a..78ce5ed2a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -170,6 +170,7 @@ jobs:
           chmod +x install-homebrew.sh
           env CI=1 ./install-homebrew.sh
           HOMEBREW_PREFIX="/home/linuxbrew/.linuxbrew"
+          sudo ${HOMEBREW_PREFIX}/bin/brew setup-sandbox
           ${HOMEBREW_PREFIX}/bin/brew install -v gcc@${COMPILER_VERSION} binutils
           ls -al ${HOMEBREW_PREFIX}/bin
           echo "PATH=${HOMEBREW_PREFIX}/bin:${PATH}" >> "$GITHUB_ENV"
@@ -190,6 +191,8 @@ jobs:
     - name: Install macOS Dependencies
       if: contains(matrix.os, 'macos')
       run: |
+        # silence Homebrew tap trust warnings:
+        (set +e ; brew untap -f aws/tap hashicorp/tap 2>&1 | perl -pe 's/#*.warning./warn: /' ; brew trust azure/bicep )
         brew update
         brew install automake # autoconf
         if [[ "${{ matrix.compiler }}@${{ matrix.version }}" == gcc@12 ]] ; then