| # fidl_api_diff |
| |
| The program `fidl_api_diff` computes the difference between two FIDL API |
| summaries produced by `fidl_api_summarize`. Its focus is API, but it also has |
| limited support for detecting breaking ABI changes. It wraps the |
| `//tools/fidl/lib/apidiff` library. |
| |
| ## Build |
| |
| ``` |
| fx set core.qemu-x64 --with //tools/fidl |
| fx build host-tools/fidl_api_diff |
| ``` |
| |
| ## Example use |
| |
| ``` |
| summarize() { |
| echo "$1" > test.fidl |
| $(fx get-build-dir)/host_x64/fidlc --json test.json --files test.fidl |
| fx fidl_api_summarize --output-file /dev/stdout --fidl-ir-file test.json |
| } |
| |
| summarize "library l; type T = table {};" > before.json |
| summarize "library l; type T = table { 1: b bool; };" > after.json |
| |
| fx fidl_api_diff --api-diff-file /dev/stdout \ |
| --before-file before.json --after-file after.json |
| ``` |
