From d2013ee5952bbcf88906a832748783e372f3a939 Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Mon, 29 May 2023 16:07:24 +0200
Subject: gcc: list warn/opt

---
 src/development/gcc.md | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/development')

diff --git a/src/development/gcc.md b/src/development/gcc.md
index 39ae753..f2bd8a0 100644
--- a/src/development/gcc.md
+++ b/src/development/gcc.md
@@ -12,6 +12,8 @@ gcc -E [-dM] ...
 - `-dM` list only `#define` statements
 - `-###` dry-run, outputting exact compiler/linker invocations
 - `-print-multi-lib` print available multilib configurations
+- `--help=<class>` print description of cmdline options for given class, eg
+  `warnings`, `optimizers`, `target`, `c`, `c++`
 
 ### Target options
 ```bash
@@ -22,6 +24,17 @@ gcc --help=target
 gcc -march=native -Q --help=target
 ```
 
+### Warnings / optimizations
+```bash
+# List available warnings with short description.
+gcc --help=warnings
+# List available optimizations with short description.
+gcc --help=optimizers
+
+# Prepend --help with `-Q` to print wheter options are enabled or disabled
+# instead showing their description.
+```
+
 ## [Builtins][builtins]
 
 ### `__builtin_expect(expr, cond)`
-- 
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