.blazerc: Work around gcc/binutils version mismatch

GCC 15+ assembler generates `.sframe` stack trace sections by default.  With
binutils 2.45, the linker fails to handle `.sframe` references correctly during
COMDAT section discarding ("relocation refers to local symbol... which is
defined in a discarded section").  We disable `.sframe` generation in the
assembler to fix the build.  This can be removed when it no longer gives an
error on gLinux Rodete.  gcc 15.2.0 and binutils 2.45 gives an error.

Add --config=host_gcc with this work-around and use it in test_bazel.sh.

Both --config=llvm and --config=gcc are broken now, for different reasons.

PiperOrigin-RevId: 881499803

Author: jmr

.bazelrc

@@ -43,6 +43,15 @@ build:gcc_clang --cxxopt=-Wno-overloaded-virtual
 build:gcc_clang --cxxopt=-Wno-defaulted-function-deleted
 build:gcc_clang --cxxopt=-Wno-nullability-completeness
 
+# WORKAROUND: GCC 15+ assembler generates `.sframe` stack trace sections by
+# default.  The linker fails to handle `.sframe` references correctly during
+# COMDAT section discarding ("relocation refers to local symbol... which is
+# defined in a discarded section").  We disable `.sframe` generation in the
+# assembler to fix the build.  This can be removed when it no longer gives
+# an error on gLinux Rodete.  gcc 15.2.0 and binutils 2.45 gives an error.
+# TOD0: b/491436022 - Try again with binutils 2.46.
+build:host_gcc --cxxopt=-Wa,--gsframe=no
+
 # ------------------------------------------------------------------------------
 # Options for Linux.
 # ------------------------------------------------------------------------------

scripts/test_bazel.sh

@@ -18,8 +18,10 @@ set -euxo pipefail
 
 echo "--- Running Bazel tests ---"
 
-# Mirroring the bazel_x64_linux workflow.
-bazel test -c fastbuild --config=dev \
+# Mirroring the bazel_x64_linux workflow, but we need --config=gcc
+# to be safe and work around the gcc/binutils version mismatch.
+# (See .bazelrc.)
+bazel test -c fastbuild --config=dev --config=host_gcc \
   --test_size_filters=-enormous \
   --test_output=errors \
   //openfst/...