Execution Caching Compiler (RECC) CppCon 2024 September 19, 2024 Shivam Bairoliya Software Engineer© 2024 Bloomberg Finance L.P. All rights reserved. What is RECC? ● Remote Execution Caching Compiler service ○ Encompasses the capabilities of both ccache and distcc ○ Supports remote linking and caching ● Designed to share caches across diverse toolchains ○ Works with many compiler toolchains (GCC Bloomberg Finance L.P. All rights reserved. Caching Action Cache Redis CAS S3 PostgreSQL recc (compiler launcher) Client Host BuildBox-CASD (Local Caching Proxy) Execution buildbox-run- bubblewrap

C++20 Modules: The Packaging and Binary Redistribution StoryScope ● Brief introduction on C++ modules and their advantages ● Focus on named modules ● Using modules today ○ Can we package module-ready |-- fmt-config.cmake | `-- fmt-targets.cmake └── libfmt.{a|so|dylib|lib} Headers Binary library “Usage requirements”C++ 20: The import keyword clang++ -std=c++20 -o hello_world.cpp.o file with module name <> file mappings) The compiler needs to locate and load the binary module interface (BMI) 👇:Binary module interfaces export module fmt; export namespace fmt { … } fmt.cc fmt

Using with fish shell To use conda with fish shell, run the following in your terminal: Add conda binary to $PATH, if not yet added: fish_add_path /condabin Configure fish-shell: which needs to be replaced by the install prefix at installation time. � Note Due to the way the binary replacement works, the placeholder prefix must be longer than the install prefix. Each line of this mode, and path, where: • Placeholder is the build or placeholder prefix. • Mode is either text or binary. • Path is the relative path of the file to be updated. EXAMPLE: On Windows: "Scripts/script1

Using with fish shell To use conda with fish shell, run the following in your terminal: Add conda binary to $PATH, if not yet added: fish_add_path /condabin Configure fish-shell: which needs to be replaced by the install prefix at installation time. � Note Due to the way the binary replacement works, the placeholder prefix must be longer than the install prefix. Each line of this mode, and path, where: • Placeholder is the build or placeholder prefix. • Mode is either text or binary. • Path is the relative path of the file to be updated. EXAMPLE: On Windows: "Scripts/script1

build on composability of bool bool:: control �ow: almost all algorithms and loops, really a lot of caching schemes (or idempotent calculations)bool bool UNDERLIES SO MUCH UNDERLIES SO MUCH It seems so trivial build on composability of bool bool:: control �ow: almost all algorithms and loops, really a lot of caching schemes (or idempotent calculations) polling/non-blocking functionsbool bool UNDERLIES SO MUCH UNDERLIES build on composability of bool bool:: control �ow: almost all algorithms and loops, really a lot of caching schemes (or idempotent calculations) polling/non-blocking functions Chain of Responsibility patternbool

Using with fish shell To use conda with fish shell, run the following in your terminal: Add conda binary to $PATH, if not yet added: fish_add_path /condabin Configure fish-shell: which needs to be replaced by the install prefix at installation time. � Note Due to the way the binary replacement works, the placeholder prefix must be longer than the install prefix. Each line of this mode, and path, where: • Placeholder is the build or placeholder prefix. • Mode is either text or binary. • Path is the relative path of the file to be updated. EXAMPLE: On Windows: "Scripts/script1

Using with fish shell To use conda with fish shell, run the following in your terminal: Add conda binary to $PATH, if not yet added: fish_add_path /condabin Configure fish-shell: which needs to be replaced by the install prefix at installation time. � Note Due to the way the binary replacement works, the placeholder prefix must be longer than the install prefix. Each line of this mode, and path, where: • Placeholder is the build or placeholder prefix. • Mode is either text or binary. • Path is the relative path of the file to be updated. EXAMPLE: On Windows: "Scripts/script1

Using with fish shell To use conda with fish shell, run the following in your terminal: Add conda binary to $PATH, if not yet added: fish_add_path /condabin Configure fish-shell: which needs to be replaced by the install prefix at installation time. Note: Due to the way the binary replacement works, the placeholder prefix must be longer than the install prefix. Each line of this mode, and path, where: • Placeholder is the build or placeholder prefix. • Mode is either text or binary. • Path is the relative path of the file to be updated. EXAMPLE: On Windows: "Scripts/script1

Using with fish shell To use conda with fish shell, run the following in your terminal: Add conda binary to $PATH, if not yet added: fish_add_path /condabin Configure fish-shell: which needs to be replaced by the install prefix at installation time. Note: Due to the way the binary replacement works, the placeholder prefix must be longer than the install prefix. Each line of this mode, and path, where: • Placeholder is the build or placeholder prefix. • Mode is either text or binary. • Path is the relative path of the file to be updated. EXAMPLE: On Windows: "Scripts/script1

Using with fish shell To use conda with fish shell, run the following in your terminal: Add conda binary to $PATH, if not yet added: fish_add_path /condabin Configure fish-shell: which needs to be replaced by the install prefix at installation time. Note: Due to the way the binary replacement works, the placeholder prefix must be longer than the install prefix. Each line of this mode, and path, where: • Placeholder is the build or placeholder prefix. • Mode is either text or binary. • Path is the relative path of the file to be updated. EXAMPLE: On Windows: "Scripts/script1