From fca69e308d25759a144b933ab231229fa48967e8 Mon Sep 17 00:00:00 2001
From: Vasyl Gello <vasek.gello@gmail.com>
Date: Sun, 29 Sep 2024 23:56:04 +0300
Subject: [PATCH] Ensure Android private functions dont show up

... for external consumers like tests

Signed-off-by: Vasyl Gello <vasek.gello@gmail.com>
---
 CMakeLists.txt    |  1 +
 include/date/tz.h | 12 ++++++++----
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index be0acc0..9b4bb20 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -112,6 +112,7 @@ endif()
 #]===================================================================]
 if( BUILD_TZ_LIB )
     add_library( date-tz )
+    target_compile_definitions( date-tz PRIVATE BUILD_TZ_LIB=1 )
     target_sources( date-tz
       PUBLIC
         $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>/date/tz.h
diff --git a/include/date/tz.h b/include/date/tz.h
index e2def47..f056849 100644
--- a/include/date/tz.h
+++ b/include/date/tz.h
@@ -139,10 +139,12 @@ namespace date
 
 enum class choose {earliest, latest};
 
-#if defined(ANDROID) || defined(__ANDROID__)
+#if defined(BUILD_TZ_LIB)
+# if defined(ANDROID) || defined(__ANDROID__)
 struct tzdb;
 static std::unique_ptr<tzdb> init_tzdb();
-#endif // defined(ANDROID) || defined(__ANDROID__)
+# endif // defined(ANDROID) || defined(__ANDROID__)
+#endif // defined(BUILD_TZ_LIB)
 
 namespace detail
 {
@@ -827,9 +829,11 @@ public:
 #if !USE_OS_TZDB
     DATE_API void add(const std::string& s);
 #else
-#if defined(ANDROID) || defined(__ANDROID__)
+# if defined(BUILD_TZ_LIB)
+#  if defined(ANDROID) || defined(__ANDROID__)
     friend std::unique_ptr<tzdb> init_tzdb();
-#endif // defined(ANDROID) || defined(__ANDROID__)
+#  endif // defined(ANDROID) || defined(__ANDROID__)
+# endif // defined(BUILD_TZ_LIB)
 #endif  // !USE_OS_TZDB
 
 private: