From c82d84bb86f9769a4f9d958f40e86cd99e071bc7 Mon Sep 17 00:00:00 2001
From: Cory Fields <cory-nospam-@coryfields.com>
Date: Wed, 2 Jul 2025 15:18:06 +0000
Subject: [PATCH] build: add CMake option for disabling symbol visibility
 attributes

Co-authored-by: Tim Ruffing <me@real-or-random.org>
---
 CMakeLists.txt     | 3 +++
 src/CMakeLists.txt | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 26cc49b1..98c51ac1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,6 +42,8 @@ endif()
 
 option(SECP256K1_INSTALL "Enable installation." ${PROJECT_IS_TOP_LEVEL})
 
+option(SECP256K1_ENABLE_API_VISIBILITY_ATTRIBUTES "Enable visibility attributes in the API." ON)
+
 ## Modules
 
 # We declare all options before processing them, to make sure we can express
@@ -312,6 +314,7 @@ else()
   set(cross_status "FALSE")
 endif()
 message("Cross compiling ....................... ${cross_status}")
+message("API visibility attributes ............. ${SECP256K1_ENABLE_API_VISIBILITY_ATTRIBUTES}")
 message("Valgrind .............................. ${SECP256K1_VALGRIND}")
 get_directory_property(definitions COMPILE_DEFINITIONS)
 string(REPLACE ";" " " definitions "${definitions}")
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 8f1d2ee3..f9ede8b6 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -54,6 +54,10 @@ add_library(secp256k1_precomputed OBJECT EXCLUDE_FROM_ALL
 # from being exported.
 target_sources(secp256k1 PRIVATE secp256k1.c $<TARGET_OBJECTS:secp256k1_precomputed>)
 
+if(NOT SECP256K1_ENABLE_API_VISIBILITY_ATTRIBUTES)
+  target_compile_definitions(secp256k1 PRIVATE SECP256K1_NO_API_VISIBILITY_ATTRIBUTES)
+endif()
+
 # Create a helper lib that parent projects can use to link secp256k1 into a
 # static lib.
 add_library(secp256k1_objs INTERFACE)