```bash
make build_envoy
#BUILD_WITH_CONTAINER=1 make build_envoy

#dry run
make -n build

#log
make V=1 build

make build BAZEL_STARTUP_ARGS='' BAZEL_BUILD_ARGS='-s  --explain=explain.txt --config=debug' BAZEL_TARGETS='//src/envoy:envoy'


make build BAZEL_STARTUP_ARGS='' BAZEL_BUILD_ARGS='-s  --explain=explain.txt --config=debug --sandbox_debug' BAZEL_TARGETS='//src/envoy:envoy'


make build BAZEL_STARTUP_ARGS='' BAZEL_BUILD_ARGS='-s  --explain=explain.txt --config=debug  --cxxopt="-fno-stack-protector" --copt="-fno-stack-protector"' BAZEL_TARGETS='//src/envoy:envoy' 2>&1 | tee bazel-log.log



```

> Makefile.core.mk
```makefile
build_envoy:
	export PATH=$(PATH) CC=$(CC) CXX=$(CXX) && \
	bazel $(BAZEL_STARTUP_ARGS) build $(BAZEL_BUILD_ARGS) $(BAZEL_CONFIG_REL) @com_googlesource_chromium_v8//:build && \
	bazel $(BAZEL_STARTUP_ARGS) build $(BAZEL_BUILD_ARGS) $(BAZEL_CONFIG_REL) //src/envoy:envoy
```


```bash
bazel info //src/envoy:envoy

bazel build //src/envoy:envoy


bazel query 'deps(//src/envoy:envoy)'

bazel query --notool_deps --noimplicit_deps  'deps(//src/envoy:envoy)' --output graph


```

#### show_args

```makefile
show_args:
	/bin/echo \
	export PATH=$(PATH) CC=$(CC) CXX=$(CXX)  \
	bazel $(BAZEL_STARTUP_ARGS) build $(BAZEL_BUILD_ARGS) $(BAZEL_CONFIG_REL) @com_googlesource_chromium_v8//:build  \
	bazel $(BAZEL_STARTUP_ARGS) build $(BAZEL_BUILD_ARGS) $(BAZEL_CONFIG_REL) //src/envoy:envoy
```


```bash
make show_args

export PATH=/usr/lib/llvm-10/bin:/root/.vscode-server/bin/6cba118ac49a1b88332f312a8f67186f7f3c1643/bin:/root/.vscode-server/bin/6cba118ac49a1b88332f312a8f67186f7f3c1643/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin CC=clang CXX=clang++ 
bazel build --config=libc++ --config=release @com_googlesource_chromium_v8//:build 
bazel build --config=libc++ --config=release //src/envoy:envoy
```


#### .bazelrc

##### strip

```bazel
build:release --strip=always
build:release-symbol -c opt
```

> https://docs.bazel.build/versions/main/user-manual.html#flag--strip

###### `--strip (always|never|sometimes)`[](https://docs.bazel.build/versions/main/user-manual.html#flag--strip)

This option determines whether Bazel will strip debugging information from all binaries and shared libraries, by invoking the linker with the `-Wl,--strip-debug` option. `--strip=always` means always strip debugging information. `--strip=never` means never strip debugging information. The default value of `--strip=sometimes` means strip if the `--compilation_mode` is `fastbuild`.

```bash
  % bazel build --strip=always //foo:bar
```

will compile the target while stripping debugging information from all generated binaries.

Note that if you want debugging information, it's not enough to disable stripping; you also need to make sure that the debugging information was generated by the compiler, which you can do by using either `-c dbg` or `--copt -g`.

Note also that Bazel's `--strip` option corresponds with ld's `--strip-debug` option: it only strips debugging information. If for some reason you want to strip _all_ symbols, not just _debug_ symbols, you would need to use ld's `--strip-all` option, which you can do by passing `--linkopt=-Wl,--strip-all` to Bazel. Also be aware that setting Bazel's `--strip` flag will override `--linkopt=-Wl,--strip-all`, so you should only set one or the other. If you are only building a single binary and want all symbols stripped, you could also pass `--stripopt=--strip-all` and explicitly build the `//foo:bar.stripped` version of the target. As described in the section on `--stripopt`, this applies a strip action after the final binary is linked rather than including stripping in all of the build's link actions.

###### `--stripopt=strip-option`[](https://docs.bazel.build/versions/main/user-manual.html#flag--stripopt)

This is an additional option to pass to the `strip` command when generating a [`*.stripped` binary](https://docs.bazel.build/versions/main/be/c-cpp.html#cc_binary_implicit_outputs). The default is `-S -p`. This option can be used multiple times.

Note that `--stripopt` does not apply to the stripping of the main binary with `[--strip](https://docs.bazel.build/versions/main/user-manual.html#flag--strip)=(always|sometimes)`


#### compilation_mode
##### `--compilation_mode (fastbuild|opt|dbg)` (-c)[](https://docs.bazel.build/versions/main/user-manual.html#flag--compilation_mode)

The `--compilation_mode` option (often shortened to `-c`, especially `-c opt`) takes an argument of `fastbuild`, `dbg` or `opt`, and affects various C/C++ code-generation options, such as the level of optimization and the completeness of debug tables. Bazel uses a different output directory for each different compilation mode, so you can switch between modes without needing to do a full rebuild _every_ time.

- `fastbuild` means build as fast as possible: generate minimal debugging information (`-gmlt -Wl,-S`), and don't optimize. This is the default. Note: `-DNDEBUG` will **not** be set.
- `dbg` means build with debugging enabled (`-g`), so that you can use gdb (or another debugger).
- `opt` means build with optimization enabled and with `assert()` calls disabled (`-O2 -DNDEBUG`). Debugging information will not be generated in `opt` mode unless you also pass `--copt -g`.



## misc
```bash
/usr/lib/llvm/bin/clang -U_FORTIFY_SOURCE -fstack-protector -Wall -Wthread-safety -Wself-assign -fcolor-diagnostics -fno-omit-frame-pointer -g '-stdlib=libc++' '-DG3_BUILD_TARGET="bazel-out/k8-dbg/bin/src/envoy/envoy"' '-DG3_TARGET_NAME="//src/envoy:envoy"' '-DBUILD_COVERAGE_ENABLED=0' '-DGPLATFORM="local"' -include bazel-out/k8-dbg/include/build-info-nonvolatile.h -include bazel-out/k8-dbg/include/build-info-volatile.h -I. -fPIC -DNULL_PLUGIN '-std=c++17' -Wnon-virtual-dtor -Wformat -Wformat-security -no-canonical-prefixes -Wno-builtin-macro-redefined '-D__DATE__="redacted"' '-D__TIMESTAMP__="redacted"' '-D__TIME__="redacted"' -c external/envoy/source/common/version/version_linkstamp.cc -o bazel-out/k8-dbg/bin/src/envoy/_objs/envoy/source/common/version/version_linkstamp.o)        


ls -lh ./bazel-bin/src/envoy/envoy
```

```
  /usr/lib/llvm/bin/clang -U_FORTIFY_SOURCE -fstack-protector -Wall -Wthread-safety -Wself-assign -fcolor-diagnostics -fno-omit-frame-pointer -g '-stdlib=libc++' '-DG3_BUILD_TARGET="bazel-out/k8-dbg/bin/src/envoy/envoy"' '-DG3_TARGET_NAME="//src/envoy:envoy"' '-DBUILD_COVERAGE_ENABLED=0' '-DGPLATFORM="local"' -include bazel-out/k8-dbg/include/build-info-nonvolatile.h -include bazel-out/k8-dbg/include/build-info-volatile.h -I. -fPIC -DNULL_PLUGIN -fno-stack-protector -fno-stack-protector -fno-stack-protector '-std=c++17' -fno-stack-protector -Wnon-virtual-dtor -Wformat -Wformat-security -fno-stack-protector -fno-stack-protector -no-canonical-prefixes -Wno-builtin-macro-redefined '-D__DATE__="redacted"' '-D__TIMESTAMP__="redacted"' '-D__TIME__="redacted"' -c external/envoy/source/common/version/version_linkstamp.cc -o bazel-out/k8-dbg/bin/src/envoy/_objs/envoy/source/common/version/version_linkstamp.o)
SUBCOMMAND: # //src/envoy:envoy [action 'Linking src/envoy/envoy', configuration: f5ecda082602d21e6681cd558254477f2008e75bb608ae4c9a8a3fcc2aa44de8, execution platform: @local_config_platform//:host]
(cd /home/.cache/bazel/_bazel_root/9fdd49e4743c3f8ee04d8f2b39e01600/execroot/io_istio_proxy && \

```