Add AsmPrinter support for emitting a directive to declare that

the code being generated does not require an executable stack.

Also, add target-specific code to make use of this on Linux
on x86. 

llvm-svn: 50634

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86Subtarget.cpp b/llvm/lib/Target/X86/X86Subtarget.cpp
index e0f350c5a1c..e555079738f 100644
--- a/llvm/lib/Target/X86/X86Subtarget.cpp
+++ b/llvm/lib/Target/X86/X86Subtarget.cpp
@@ -278,6 +278,8 @@ X86Subtarget::X86Subtarget(const Module &M, const std::string &FS, bool is64Bit)
         DarwinVers = atoi(&TT[Pos+7]);
       else
         DarwinVers = 8;  // Minimum supported darwin is Tiger.
+    } else if (TT.find("linux") != std::string::npos) {
+      TargetType = isELFLinux;
     } else if (TT.find("cygwin") != std::string::npos) {
       TargetType = isCygwin;
     } else if (TT.find("mingw") != std::string::npos) {
@@ -302,6 +304,9 @@ X86Subtarget::X86Subtarget(const Module &M, const std::string &FS, bool is64Bit)
     
 #elif defined(_WIN32) || defined(_WIN64)
     TargetType = isWindows;
+#elif defined(__linux__)
+    // Linux doesn't imply ELF, but we don't currently support anything else.
+    TargetType = isELFLinux;
 #endif
   }