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-rw-r--r--docs/manual/adding-packages-directory.txt14
1 files changed, 14 insertions, 0 deletions
diff --git a/docs/manual/adding-packages-directory.txt b/docs/manual/adding-packages-directory.txt
index b9596a28ca..aa9f4e81f4 100644
--- a/docs/manual/adding-packages-directory.txt
+++ b/docs/manual/adding-packages-directory.txt
@@ -279,6 +279,20 @@ use in the comment.
** Dependency symbol: +BR2_ARCH_HAS_ATOMICS+
** Comment string: no comment to be added
+* Gcc +__sync_*+ built-ins used for atomic operations. They are
+ available in variants operating on 1 byte, 2 bytes, 4 bytes and 8
+ bytes. Since different architectures support atomic operations on
+ different sizes, one dependency symbol is available for each size:
+** Dependency symbol: +BR2_TOOLCHAIN_HAS_SYNC_1+ for 1 byte,
+ +BR2_TOOLCHAIN_HAS_SYNC_2+ for 2 bytes,
+ +BR2_TOOLCHAIN_HAS_SYNC_4+ for 4 bytes, +BR2_TOOLCHAIN_HAS_SYNC_8+
+ for 8 bytes.
+** Comment string: no comment to be added
+
+* Gcc +__atomic_*+ built-ins used for atomic operations.
+** Dependency symbol: +BR2_TOOLCHAIN_HAS_ATOMIC+.
+** Comment string: no comment to be added
+
* Kernel headers
** Dependency symbol: +BR2_TOOLCHAIN_HEADERS_AT_LEAST_X_Y+, (replace
+X_Y+ with the proper version, see +toolchain/toolchain-common.in+)
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