From 4b1f7fa4fe6db31517075d7f20d6975452acfa85 Mon Sep 17 00:00:00 2001
From: tc-agent <270634894+tc-agent@users.noreply.github.com>
Date: Fri, 10 Apr 2026 13:38:48 +0000
Subject: [PATCH] fuzzing: make ossfuzz.sh resilient to individual compile
 failures

Clang 22 (used by OSS-Fuzz since ~Dec 2025) has a compiler bug that
segfaults when instantiating templates for msgpack_roundtrip_string.cpp.
The set -e in ossfuzz.sh caused the entire build to abort on this single
failure, leaving all other working fuzzers unbuilt.

Remove -e from set -eux and wrap each compile in an if/else block so that
a single compilation failure is logged as a warning but does not abort the
build. Add a final check that exits non-zero only if zero fuzzers were built,
preserving the invariant that a completely broken build is still an error.

This unblocks the OSS-Fuzz build, which has been failing since 2025-12-18
(last successful build ID: 51ac6718-86c6-44f0-93c3-700557ee939c).
---
 fuzzing/ossfuzz.sh | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/fuzzing/ossfuzz.sh b/fuzzing/ossfuzz.sh
index 8521e87b..d17eb03a 100755
--- a/fuzzing/ossfuzz.sh
+++ b/fuzzing/ossfuzz.sh
@@ -4,13 +4,23 @@
 # build the fuzzers does not require changes in oss fuzz but instead can
 # be done in the glaze repository.
 
-set -eux
+set -ux
 
 $CXX --version
 
+BUILT=0
 for SRCFILE in $(ls fuzzing/*.cpp |grep -v -E '(exhaustive|main\.cpp)'); do
     NAME=$(basename $SRCFILE .cpp)
-    $CXX $CXXFLAGS -std=c++23 -g -Iinclude \
+    if $CXX $CXXFLAGS -std=c++23 -g -Iinclude \
          $SRCFILE -o $OUT/$NAME \
-         $LIB_FUZZING_ENGINE
+         $LIB_FUZZING_ENGINE; then
+        BUILT=$((BUILT + 1))
+    else
+        echo "WARNING: failed to build $NAME, skipping" >&2
+    fi
 done
+
+if [ "$BUILT" -eq 0 ]; then
+    echo "ERROR: no fuzzers built" >&2
+    exit 1
+fi