llvm-cov: Implement the preserve-paths flag
Until now, when a path in a gcno file included a directory, we would
emit our .gcov file in that directory, whereas gcov always emits the
file in the current directory. In doing so, this implements gcov's
strange name-mangling -p flag, which is needed to avoid clobbering
files when two with the same name exist in different directories.
The path mangling is a bit ugly and only handles unix-like paths, but
it's simple, and it doesn't make any guesses as to how it should
behave outside of what gcov documents. If we decide this should be
cross platform later, we can consider the compatibility implications
then.
llvm-svn: 200754
diff --git a/llvm/test/tools/llvm-cov/llvm-cov.test b/llvm/test/tools/llvm-cov/llvm-cov.test
index 2391082..c52a981 100644
--- a/llvm/test/tools/llvm-cov/llvm-cov.test
+++ b/llvm/test/tools/llvm-cov/llvm-cov.test
@@ -21,6 +21,18 @@
RUN: diff -aub test_objdir.cpp.gcov test.cpp.gcov
RUN: diff -aub test_objdir.h.gcov test.h.gcov
+# Preserve paths. This mangles the output filenames.
+RUN: mkdir -p %t/srcdir/nested_dir
+RUN: cp test.cpp test.h %t/srcdir
+RUN: llvm-cov -p test_paths.cpp | diff -u test_preserve_paths.output -
+RUN: diff -aub test_paths.cpp.gcov srcdir#nested_dir#^#test.cpp.gcov
+RUN: diff -aub test_paths.h.gcov srcdir#nested_dir#^#test.h.gcov
+
+# Don't preserve paths. Same results as preserve paths, but no mangling.
+RUN: llvm-cov test_paths.cpp | diff -u test_no_preserve_paths.output -
+RUN: diff -aub test_paths.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_paths.h.gcov test.h.gcov
+
# Function summaries. This changes stdout, but not the gcov files.
RUN: llvm-cov test.c -f | diff -u test_-f.output -
RUN: diff -aub test_no_options.cpp.gcov test.cpp.gcov