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-rw-r--r--CMake/CurlSymbolHiding.cmake61
1 files changed, 61 insertions, 0 deletions
diff --git a/CMake/CurlSymbolHiding.cmake b/CMake/CurlSymbolHiding.cmake
new file mode 100644
index 000000000..9f7d29633
--- /dev/null
+++ b/CMake/CurlSymbolHiding.cmake
@@ -0,0 +1,61 @@
+include(CheckCSourceCompiles)
+
+option(CURL_HIDDEN_SYMBOLS "Set to ON to hide libcurl internal symbols (=hide all symbols that aren't officially external)." ON)
+mark_as_advanced(CURL_HIDDEN_SYMBOLS)
+
+if(CURL_HIDDEN_SYMBOLS)
+ set(SUPPORTS_SYMBOL_HIDING FALSE)
+
+ if(CMAKE_C_COMPILER_ID MATCHES "Clang")
+ set(SUPPORTS_SYMBOL_HIDING TRUE)
+ set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
+ set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
+ elseif(CMAKE_COMPILER_IS_GNUCC)
+ if(NOT CMAKE_VERSION VERSION_LESS 2.8.10)
+ set(GCC_VERSION ${CMAKE_C_COMPILER_VERSION})
+ else()
+ execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpversion
+ OUTPUT_VARIABLE GCC_VERSION)
+ endif()
+ if(NOT GCC_VERSION VERSION_LESS 3.4)
+ # note: this is considered buggy prior to 4.0 but the autotools don't care, so let's ignore that fact
+ set(SUPPORTS_SYMBOL_HIDING TRUE)
+ set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
+ set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
+ endif()
+ elseif(CMAKE_C_COMPILER_ID MATCHES "SunPro" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.0)
+ set(SUPPORTS_SYMBOL_HIDING TRUE)
+ set(_SYMBOL_EXTERN "__global")
+ set(_CFLAG_SYMBOLS_HIDE "-xldscope=hidden")
+ elseif(CMAKE_C_COMPILER_ID MATCHES "Intel" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 9.0)
+ # note: this should probably just check for version 9.1.045 but I'm not 100% sure
+ # so let's to it the same way autotools do.
+ set(SUPPORTS_SYMBOL_HIDING TRUE)
+ set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
+ set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
+ check_c_source_compiles("#include <stdio.h>
+ int main (void) { printf(\"icc fvisibility bug test\"); return 0; }" _no_bug)
+ if(NOT _no_bug)
+ set(SUPPORTS_SYMBOL_HIDING FALSE)
+ set(_SYMBOL_EXTERN "")
+ set(_CFLAG_SYMBOLS_HIDE "")
+ endif()
+ elseif(MSVC)
+ set(SUPPORTS_SYMBOL_HIDING TRUE)
+ endif()
+
+ set(HIDES_CURL_PRIVATE_SYMBOLS ${SUPPORTS_SYMBOL_HIDING})
+elseif(MSVC)
+ if(NOT CMAKE_VERSION VERSION_LESS 3.7)
+ set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE) #present since 3.4.3 but broken
+ set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
+ else()
+ message(WARNING "Hiding private symbols regardless CURL_HIDDEN_SYMBOLS being disabled.")
+ set(HIDES_CURL_PRIVATE_SYMBOLS TRUE)
+ endif()
+elseif()
+ set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
+endif()
+
+set(CURL_CFLAG_SYMBOLS_HIDE ${_CFLAG_SYMBOLS_HIDE})
+set(CURL_EXTERN_SYMBOL ${_SYMBOL_EXTERN})