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scotthart merged 2 commits into from
Feb 11, 2026
Merged

impl(v3): update opentelemetry quickstart #15955

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aa49592
impl(v3): update opentelemetry quickstart
scotthart Feb 11, 2026
9c8aacd
updated cmake flag name
scotthart Feb 11, 2026
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17 changes: 0 additions & 17 deletions google/cloud/opentelemetry/quickstart/.bazelrc
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Original file line number Diff line number Diff line change
Expand Up @@ -15,12 +15,9 @@
# Use host-OS-specific config lines from bazelrc files.
build --enable_platform_specific_config=true



build:linux --cxxopt=-std=c++17
build:macos --cxxopt=-std=c++17


build:linux --host_cxxopt=-std=c++17
build:macos --host_cxxopt=-std=c++17

Expand All @@ -29,20 +26,6 @@ build:macos --host_cxxopt=-std=c++17
# the project separately.
build --experimental_convenience_symlinks=ignore

# Enable OpenTelemetry tracing instrumentation for google-cloud-cpp.
build --@google_cloud_cpp//:enable_opentelemetry

# OpenTelemetry versions < v1.16.0 are not compatible with Abseil
# out-of-the-box. If you are using a version of OpenTelemetry < v1.16.0,
# uncomment the following configuration:
#
# ```
# build --@io_opentelemetry_cpp//api:with_abseil
# ```
#
# Note that the flag is not required for OpenTelemetry versions >= v1.16.0. In
# fact, the flag may be removed in future versions of OpenTelemetry.

#Our quickstarts do not yet support bzlmod
build --noenable_bzlmod
build --enable_workspace
16 changes: 8 additions & 8 deletions google/cloud/opentelemetry/quickstart/README.md
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Expand Up @@ -42,12 +42,11 @@ observability into their operation at runtime. To enable tracing,
OpenTelemetry provides full [install instructions][opentelemetry-cpp-install].
We will highlight the important points.

### Compatibility with Abseil
### Standard Template Library (STL) types

OpenTelemetry vendors-in Abseil types, defining them in `namespace absl`. The
Google Cloud client libraries depends on Abseil, which also defines these types
in the same namespace. In order to avoid ambiguous symbols, we must set certain
flags when compiling `opentelemetry-cpp`.
OpenTelemetry provides implementations for some STL types via several sources:
Abseil, its own `nostd` implementation, and the STL bundled with your compiler.
The `google-cloud-cpp` libraries require using the STL implementation.

## Using with Bazel

Expand Down Expand Up @@ -117,7 +116,7 @@ To enable these features, add the following to your CMake configuration command:

#### Details

We must supply the `-DWITH_ABSEIL=ON` flag when compiling `opentelemetry-cpp`
We must supply the `-DWITH_STL=CXX17` flag when compiling `opentelemetry-cpp`
for compatibility with Abseil.

We must also ensure that the `-DCMAKE_CXX_STANDARD` used to compile
Expand All @@ -126,8 +125,9 @@ We must also ensure that the `-DCMAKE_CXX_STANDARD` used to compile
OpenTelemetry defaults the language standard if it is not explicitly set. So it
is good practice to explicitly set the language standard.

While OpenTelemetry supports C++>=11, `google-cloud-cpp` requires C++>=14. So
you can use `-DCMAKE_CXX_STANDARD=14`, `-DCMAKE_CXX_STANDARD=17`, or higher.
While OpenTelemetry supports C++>=11, `google-cloud-cpp` requires C++>=17. So
you can use `-DCMAKE_CXX_STANDARD=17`, or higher, just make sure it matches the
standard value in the `-DWITH_STL=CXXnn` flag.

### Package Managers

Expand Down