From 2610acf808799cdc1f4fa730ef549bba0402363a Mon Sep 17 00:00:00 2001
From: Chris Denton <chris@chrisdenton.dev>
Date: Thu, 4 Jan 2024 19:43:05 +0000
Subject: [PATCH] Document `target_abi`

---
 src/conditional-compilation.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/conditional-compilation.md b/src/conditional-compilation.md
index e724b21e2..e245c132d 100644
--- a/src/conditional-compilation.md
+++ b/src/conditional-compilation.md
@@ -166,6 +166,21 @@ Example values:
 * `"musl"`
 * `"sgx"`
 
+### `target_abi`
+
+Key-value option set to further disambiguate the `target_env` with information
+about the target ABI. For historical reasons,
+this value is only defined as not the empty-string when actually needed for
+disambiguation. Thus, for example, on many GNU platforms, this value will be
+empty.
+
+Example values:
+
+* `""`
+* `"llvm"`
+* `"eabihf"`
+* `"abi64"`
+
 ### `target_endian`
 
 Key-value option set once with either a value of "little" or "big" depending