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Fix -fmacro-backtrace-limit=0 to show the entire macro backtrace.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148930 91177308-0d34-0410-b5e6-96231b3b80d8
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commit cf2362b76b624b90e2649497ab8019bcce959bf4 1 parent 3b6b61e
@krememek krememek authored
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3  lib/Frontend/DiagnosticRenderer.cpp
@@ -260,7 +260,8 @@ void DiagnosticRenderer::emitMacroExpansionsAndCarets(
Loc = getImmediateMacroCalleeLoc(SM, Loc);
unsigned MacroSkipStart = 0, MacroSkipEnd = 0;
- if (MacroDepth > DiagOpts.MacroBacktraceLimit) {
+ if (MacroDepth > DiagOpts.MacroBacktraceLimit &&
+ DiagOpts.MacroBacktraceLimit != 0) {
MacroSkipStart = DiagOpts.MacroBacktraceLimit / 2 +
DiagOpts.MacroBacktraceLimit % 2;
MacroSkipEnd = MacroDepth - DiagOpts.MacroBacktraceLimit / 2;
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53 test/Misc/diag-macro-backtrace.c
@@ -0,0 +1,53 @@
+// RUN: %clang -fsyntax-only -fmacro-backtrace-limit=0 %s 2>&1 | FileCheck %s
+
+#define FOO 1+"hi"
+#define BAR FOO
+#define BAZ BAR
+#define QUZ BAZ
+#define TAZ QUZ
+#define ABA TAZ
+#define BAB ABA
+#define ZAZ BAB
+#define WAZ ZAZ
+#define DROOL WAZ
+#define FOOL DROOL
+
+FOOL
+
+// CHECK: :15:1: error: expected identifier or '('
+// CHECK: FOOL
+// CHECK: ^
+// CHECK: :13:14: note: expanded from macro 'FOOL'
+// CHECK: #define FOOL DROOL
+// CHECK: ^
+// CHECK: :12:15: note: expanded from macro 'DROOL'
+// CHECK: #define DROOL WAZ
+// CHECK: ^
+// CHECK: :11:13: note: expanded from macro 'WAZ'
+// CHECK: #define WAZ ZAZ
+// CHECK: ^
+// CHECK: :10:13: note: expanded from macro 'ZAZ'
+// CHECK: #define ZAZ BAB
+// CHECK: ^
+// CHECK: :9:13: note: expanded from macro 'BAB'
+// CHECK: #define BAB ABA
+// CHECK: ^
+// CHECK: :8:13: note: expanded from macro 'ABA'
+// CHECK: #define ABA TAZ
+// CHECK: ^
+// CHECK: :7:13: note: expanded from macro 'TAZ'
+// CHECK: #define TAZ QUZ
+// CHECK: ^
+// CHECK: :6:13: note: expanded from macro 'QUZ'
+// CHECK: #define QUZ BAZ
+// CHECK: ^
+// CHECK: :5:13: note: expanded from macro 'BAZ'
+// CHECK: #define BAZ BAR
+// CHECK: ^
+// CHECK: :4:13: note: expanded from macro 'BAR'
+// CHECK: #define BAR FOO
+// CHECK: ^
+// CHECK: :3:13: note: expanded from macro 'FOO'
+// CHECK: #define FOO 1+"hi"
+// CHECK: ^
+// CHECK: 1 error generated.
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