Disable shared library support when compiler links statically

When a user or a compiler wrapper adds '-static' to the compiler flags
then it will always link static binaries.  Detect this from the compiler
id binary and disable TARGET_SUPPORTS_SHARED_LIBS.  This will prevent
projects from accidentally adding shared libraries when the toolchain
does not support them.  It also helps CMake avoid linking with flags
that require shared libraries to be supported.

7 files changed, 23 insertions, 0 deletions

diff --git a/Modules/CMakeCCompiler.cmake.in b/Modules/CMakeCCompiler.cmake.in
index c72e338..a1bfc70 100644
--- a/Modules/CMakeCCompiler.cmake.in
+++ b/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@")
diff --git a/Modules/CMakeCInformation.cmake b/Modules/CMakeCInformation.cmake
index d2417aa..0d102a1 100644
--- a/Modules/CMakeCInformation.cmake
+++ b/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.
diff --git a/Modules/CMakeCXXCompiler.cmake.in b/Modules/CMakeCXXCompiler.cmake.in
index 52e44f6..4218a6d 100644
--- a/Modules/CMakeCXXCompiler.cmake.in
+++ b/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@")
diff --git a/Modules/CMakeCXXInformation.cmake b/Modules/CMakeCXXInformation.cmake
index 091627b..dad7969 100644
--- a/Modules/CMakeCXXInformation.cmake
+++ b/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.
diff --git a/Modules/CMakeDetermineCompilerId.cmake b/Modules/CMakeDetermineCompilerId.cmake
index df6daf3..591ecb8 100644
--- a/Modules/CMakeDetermineCompilerId.cmake
+++ b/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}")
diff --git a/Modules/CMakeFortranCompiler.cmake.in b/Modules/CMakeFortranCompiler.cmake.in
index 14fdd60..6b984e5 100644
--- a/Modules/CMakeFortranCompiler.cmake.in
+++ b/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@")
diff --git a/Modules/CMakeFortranInformation.cmake b/Modules/CMakeFortranInformation.cmake
index 79393d3..aa48df7 100644
--- a/Modules/CMakeFortranInformation.cmake
+++ b/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.