Implemented the code to make llvm-nm’s -g option work.

While llvm-nm parses the -g option and has help that describes it as:

  -extern-only            - Show only external symbols

There is no code in the program to use the boolean valve it sets from the
command line.

rdar://23261095

llvm-svn: 251718

4 files changed, 9 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-nm/X86/Inputs/hello.obj.macho-x86_64 b/llvm/test/tools/llvm-nm/X86/Inputs/hello.obj.macho-x86_64
new file mode 100644
index 00000000000..2b59a1cfc63
--- /dev/null
+++ b/llvm/test/tools/llvm-nm/X86/Inputs/hello.obj.macho-x86_64
diff --git a/llvm/test/tools/llvm-nm/X86/externalonly.test b/llvm/test/tools/llvm-nm/X86/externalonly.test
new file mode 100644
index 00000000000..c3741298786
--- /dev/null
+++ b/llvm/test/tools/llvm-nm/X86/externalonly.test
@@ -0,0 +1,4 @@
+# RUN: llvm-nm -g %p/Inputs/hello.obj.macho-x86_64 | FileCheck %s
+
+# CHECK-NOT: EH_frame0
+# CHECK: _main
diff --git a/llvm/test/tools/llvm-nm/lit.local.cfg b/llvm/test/tools/llvm-nm/lit.local.cfg
new file mode 100644
index 00000000000..c8625f4d9d2
--- /dev/null
+++ b/llvm/test/tools/llvm-nm/lit.local.cfg
@@ -0,0 +1,2 @@
+if not 'X86' in config.root.targets:
+    config.unsupported = True
diff --git a/llvm/tools/llvm-nm/llvm-nm.cpp b/llvm/tools/llvm-nm/llvm-nm.cpp
index a0b5e9b4eaa..9d0cc575843 100644
--- a/llvm/tools/llvm-nm/llvm-nm.cpp
+++ b/llvm/tools/llvm-nm/llvm-nm.cpp
@@ -529,6 +529,9 @@ static void sortAndPrintSymbolList(SymbolicFile &Obj, bool printName,
       continue;
     if (Undefined && DefinedOnly)
       continue;
+    bool Global = SymFlags & SymbolRef::SF_Global;
+    if (!Global && ExternalOnly)
+      continue;
     if (SizeSort && !PrintAddress)
       continue;
     if (PrintFileName) {