AIX: Add an option to disable automatic exports from shared libraries

Since commit 0f150b69d3 (AIX: Explicitly compute shared object exports
for both XL and GNU, 2019-07-11, v3.16.0-rc1~418^2~2) we always export
all symbols from shared libraries by default.  Add a new target property
called `AIX_EXPORT_ALL_SYMBOLS` that can be explicitly set to OFF to
suppress this behavior and export no symbols by default.

Fixes: #20290

1 files changed, 3 insertions, 0 deletions

diff --git a/Source/cmMakefileExecutableTargetGenerator.cxx b/Source/cmMakefileExecutableTargetGenerator.cxx
index 1df5410..0471a45 100644
--- a/Source/cmMakefileExecutableTargetGenerator.cxx
+++ b/Source/cmMakefileExecutableTargetGenerator.cxx
@@ -196,6 +196,8 @@ void cmMakefileExecutableTargetGenerator::WriteDeviceExecutableRule(
     this->CreateObjectLists(useLinkScript, false, useResponseFileForObjects,
                             buildObjs, depends, useWatcomQuote);
 
+    std::string const& aixExports = this->GetAIXExports(this->GetConfigName());
+
     cmRulePlaceholderExpander::RuleVariables vars;
     std::string objectDir = this->GeneratorTarget->GetSupportDirectory();
 
@@ -219,6 +221,7 @@ void cmMakefileExecutableTargetGenerator::WriteDeviceExecutableRule(
                                                   cmOutputConverter::SHELL);
 
     vars.Language = linkLanguage.c_str();
+    vars.AIXExports = aixExports.c_str();
     vars.Objects = buildObjs.c_str();
     vars.ObjectDir = objectDir.c_str();
     vars.Target = target.c_str();