From 56148fd2bc5ddbf32b89bbf94034ea4b14c6716d Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 20 Jun 2012 11:04:35 -0400
Subject: [PATCH] Do not crash on SHARED library without language (#13324)

Since commit e1409ac5 (Support building shared libraries or modules
without soname, 2012-04-22) CMake crashes on the code

 add_library(foo SHARED foo.nolang)

because the logic to lookup the language's soname flag was moved from
cmTarget::GetLibraryNames to cmMakefile::GetSONameFlag without its check
for a NULL language.  Restore the check for NULL.

Add RunCMake.Languages test to cover language error cases like this one.
---
 Source/cmMakefile.cxx                            | 8 ++++++--
 Tests/RunCMake/CMakeLists.txt                    | 1 +
 Tests/RunCMake/Languages/CMakeLists.txt          | 3 +++
 Tests/RunCMake/Languages/NoLangSHARED-result.txt | 1 +
 Tests/RunCMake/Languages/NoLangSHARED-stderr.txt | 1 +
 Tests/RunCMake/Languages/NoLangSHARED.cmake      | 1 +
 Tests/RunCMake/Languages/RunCMakeTest.cmake      | 3 +++
 Tests/RunCMake/Languages/foo.nolang              | 0
 8 files changed, 16 insertions(+), 2 deletions(-)
 create mode 100644 Tests/RunCMake/Languages/CMakeLists.txt
 create mode 100644 Tests/RunCMake/Languages/NoLangSHARED-result.txt
 create mode 100644 Tests/RunCMake/Languages/NoLangSHARED-stderr.txt
 create mode 100644 Tests/RunCMake/Languages/NoLangSHARED.cmake
 create mode 100644 Tests/RunCMake/Languages/RunCMakeTest.cmake
 create mode 100644 Tests/RunCMake/Languages/foo.nolang

diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 0a709ae90..1d78b3a02 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -2197,8 +2197,12 @@ bool cmMakefile::PlatformIs64Bit() const
 
 const char* cmMakefile::GetSONameFlag(const char* language) const
 {
-  std::string name = "CMAKE_SHARED_LIBRARY_SONAME_";
-  name += language;
+  std::string name = "CMAKE_SHARED_LIBRARY_SONAME";
+  if(language)
+    {
+    name += "_";
+    name += language;
+    }
   name += "_FLAG";
   return GetDefinition(name.c_str());
 }
diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index 1c6db390e..23fc086d8 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -45,6 +45,7 @@ macro(add_RunCMake_test test)
     )
 endmacro()
 
+add_RunCMake_test(Languages)
 add_RunCMake_test(ObjectLibrary)
 
 add_RunCMake_test(build_command)
diff --git a/Tests/RunCMake/Languages/CMakeLists.txt b/Tests/RunCMake/Languages/CMakeLists.txt
new file mode 100644
index 000000000..e8db6b05b
--- /dev/null
+++ b/Tests/RunCMake/Languages/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 2.8)
+project(${RunCMake_TEST} NONE)
+include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/Languages/NoLangSHARED-result.txt b/Tests/RunCMake/Languages/NoLangSHARED-result.txt
new file mode 100644
index 000000000..d00491fd7
--- /dev/null
+++ b/Tests/RunCMake/Languages/NoLangSHARED-result.txt
@@ -0,0 +1 @@
+1
diff --git a/Tests/RunCMake/Languages/NoLangSHARED-stderr.txt b/Tests/RunCMake/Languages/NoLangSHARED-stderr.txt
new file mode 100644
index 000000000..3f93cf86c
--- /dev/null
+++ b/Tests/RunCMake/Languages/NoLangSHARED-stderr.txt
@@ -0,0 +1 @@
+CMake Error: CMake can not determine linker language for target:NoLang
diff --git a/Tests/RunCMake/Languages/NoLangSHARED.cmake b/Tests/RunCMake/Languages/NoLangSHARED.cmake
new file mode 100644
index 000000000..de6adf7cb
--- /dev/null
+++ b/Tests/RunCMake/Languages/NoLangSHARED.cmake
@@ -0,0 +1 @@
+add_library(NoLang SHARED foo.nolang)
diff --git a/Tests/RunCMake/Languages/RunCMakeTest.cmake b/Tests/RunCMake/Languages/RunCMakeTest.cmake
new file mode 100644
index 000000000..a99548f05
--- /dev/null
+++ b/Tests/RunCMake/Languages/RunCMakeTest.cmake
@@ -0,0 +1,3 @@
+include(RunCMake)
+
+run_cmake(NoLangSHARED)
diff --git a/Tests/RunCMake/Languages/foo.nolang b/Tests/RunCMake/Languages/foo.nolang
new file mode 100644
index 000000000..e69de29bb