Merge topic 'compiler-links-statically'

8b4873a1 Disable shared library support when compiler links statically
e90f463a Drop executable symbol export if platform does not support shared libs

Modules/CMakeCCompiler.cmake.in

@@ -2,6 +2,7 @@ set(CMAKE_C_COMPILER "@CMAKE_C_COMPILER@")
 set(CMAKE_C_COMPILER_ARG1 "@CMAKE_C_COMPILER_ARG1@")
 set(CMAKE_C_COMPILER_ID "@CMAKE_C_COMPILER_ID@")
 set(CMAKE_C_COMPILER_VERSION "@CMAKE_C_COMPILER_VERSION@")
+set(CMAKE_C_COMPILER_LINKS_STATICALLY "@CMAKE_C_COMPILER_LINKS_STATICALLY@")
 set(CMAKE_C_STANDARD_COMPUTED_DEFAULT "@CMAKE_C_STANDARD_COMPUTED_DEFAULT@")
 set(CMAKE_C_COMPILE_FEATURES "@CMAKE_C_COMPILE_FEATURES@")
 set(CMAKE_C90_COMPILE_FEATURES "@CMAKE_C90_COMPILE_FEATURES@")

Modules/CMakeCInformation.cmake

@@ -75,6 +75,10 @@ if(CMAKE_C_SIZEOF_DATA_PTR)
   unset(CMAKE_C_ABI_FILES)
 endif()
 
+if(CMAKE_C_COMPILER_LINKS_STATICALLY)
+  set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS FALSE)
+endif()
+
 # This should be included before the _INIT variables are
 # used to initialize the cache.  Since the rule variables
 # have if blocks on them, users can still define them here.

Modules/CMakeCXXCompiler.cmake.in

@@ -2,6 +2,7 @@ set(CMAKE_CXX_COMPILER "@CMAKE_CXX_COMPILER@")
 set(CMAKE_CXX_COMPILER_ARG1 "@CMAKE_CXX_COMPILER_ARG1@")
 set(CMAKE_CXX_COMPILER_ID "@CMAKE_CXX_COMPILER_ID@")
 set(CMAKE_CXX_COMPILER_VERSION "@CMAKE_CXX_COMPILER_VERSION@")
+set(CMAKE_CXX_COMPILER_LINKS_STATICALLY "@CMAKE_CXX_COMPILER_LINKS_STATICALLY@")
 set(CMAKE_CXX_STANDARD_COMPUTED_DEFAULT "@CMAKE_CXX_STANDARD_COMPUTED_DEFAULT@")
 set(CMAKE_CXX_COMPILE_FEATURES "@CMAKE_CXX_COMPILE_FEATURES@")
 set(CMAKE_CXX98_COMPILE_FEATURES "@CMAKE_CXX98_COMPILE_FEATURES@")

Modules/CMakeCXXInformation.cmake

@@ -74,6 +74,10 @@ if(CMAKE_CXX_SIZEOF_DATA_PTR)
   unset(CMAKE_CXX_ABI_FILES)
 endif()
 
+if(CMAKE_CXX_COMPILER_LINKS_STATICALLY)
+  set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS FALSE)
+endif()
+
 # This should be included before the _INIT variables are
 # used to initialize the cache.  Since the rule variables
 # have if blocks on them, users can still define them here.

Modules/CMakeDetermineCompilerId.cmake

@@ -106,6 +106,7 @@ function(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
   set(MSVC_${lang}_ARCHITECTURE_ID "${MSVC_${lang}_ARCHITECTURE_ID}"
     PARENT_SCOPE)
   set(CMAKE_${lang}_CL_SHOWINCLUDES_PREFIX "${CMAKE_${lang}_CL_SHOWINCLUDES_PREFIX}" PARENT_SCOPE)
+  set(CMAKE_${lang}_COMPILER_LINKS_STATICALLY "${CMAKE_${lang}_COMPILER_LINKS_STATICALLY}" PARENT_SCOPE)
   set(CMAKE_${lang}_COMPILER_VERSION "${CMAKE_${lang}_COMPILER_VERSION}" PARENT_SCOPE)
   set(CMAKE_${lang}_SIMULATE_ID "${CMAKE_${lang}_SIMULATE_ID}" PARENT_SCOPE)
   set(CMAKE_${lang}_SIMULATE_VERSION "${CMAKE_${lang}_SIMULATE_VERSION}" PARENT_SCOPE)
@@ -529,6 +530,13 @@ function(CMAKE_DETERMINE_COMPILER_ID_CHECK lang file)
       endif()
     endif()
 
+    if(UNIX)
+      execute_process(COMMAND file "${file}" OUTPUT_VARIABLE out ERROR_VARIABLE out)
+      if(out MATCHES "statically linked")
+        set(CMAKE_${lang}_COMPILER_LINKS_STATICALLY 1 PARENT_SCOPE)
+      endif()
+    endif()
+
     # Check if a valid compiler and platform were found.
     if(COMPILER_ID AND NOT COMPILER_ID_TWICE)
       set(CMAKE_${lang}_COMPILER_ID "${COMPILER_ID}")

Modules/CMakeFortranCompiler.cmake.in

@@ -2,6 +2,7 @@ set(CMAKE_Fortran_COMPILER "@CMAKE_Fortran_COMPILER@")
 set(CMAKE_Fortran_COMPILER_ARG1 "@CMAKE_Fortran_COMPILER_ARG1@")
 set(CMAKE_Fortran_COMPILER_ID "@CMAKE_Fortran_COMPILER_ID@")
 set(CMAKE_Fortran_COMPILER_VERSION "@CMAKE_Fortran_COMPILER_VERSION@")
+set(CMAKE_Fortran_COMPILER_LINKS_STATICALLY "@CMAKE_Fortran_COMPILER_LINKS_STATICALLY@")
 set(CMAKE_Fortran_PLATFORM_ID "@CMAKE_Fortran_PLATFORM_ID@")
 set(CMAKE_Fortran_SIMULATE_ID "@CMAKE_Fortran_SIMULATE_ID@")
 set(CMAKE_Fortran_SIMULATE_VERSION "@CMAKE_Fortran_SIMULATE_VERSION@")

Modules/CMakeFortranInformation.cmake

@@ -51,6 +51,10 @@ if(CMAKE_Fortran_SIZEOF_DATA_PTR)
   unset(CMAKE_Fortran_ABI_FILES)
 endif()
 
+if(CMAKE_Fortran_COMPILER_LINKS_STATICALLY)
+  set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS FALSE)
+endif()
+
 # This should be included before the _INIT variables are
 # used to initialize the cache.  Since the rule variables
 # have if blocks on them, users can still define them here.

Source/cmLocalGenerator.cxx

@@ -1542,7 +1542,9 @@ void cmLocalGenerator::OutputLinkLibraries(std::string& linkLibraries,
     this->Makefile->GetSafeDefinition("CMAKE_LIBRARY_PATH_TERMINATOR");
 
   // Flags to link an executable to shared libraries.
-  if( tgt.GetType() == cmTarget::EXECUTABLE )
+  if (tgt.GetType() == cmTarget::EXECUTABLE &&
+      this->StateSnapshot.GetState()->
+        GetGlobalPropertyAsBool("TARGET_SUPPORTS_SHARED_LIBS"))
     {
     bool add_shlib_flags = false;
     switch(tgt.Target->GetPolicyStatusCMP0065())