llvm-cov: Fix reading gcov data that does not have function names

In order for recent gcov versions to read the coverage data, you have
to use UseCfgChecksum=true and FunctionNamesInData=false options for
coverage profiling pass. This is because gcov is expecting the
function section in .gcda to be exactly 3 words in size, containing
ident and two checksums.

While llvm-cov is compatible with UseCfgChecksum=true, it always
expects a function name in .gcda function sections (it's not
compatible with FunctionNamesInData=false). Thus it's currently
impossible to generate one set of coverage files that works with both
gcov and llvm-cov.

This change fixes the reading of coverage information to only read the
function name if it's present.

Patch by Arseny Kapoulkine. Thanks!

llvm-svn: 260162

2 files changed, 0 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-cov/Inputs/gcov47_compatibility.gcda b/llvm/test/tools/llvm-cov/Inputs/gcov47_compatibility.gcda
new file mode 100644
index 00000000000..825156ba63a
--- /dev/null
+++ b/llvm/test/tools/llvm-cov/Inputs/gcov47_compatibility.gcda
diff --git a/llvm/test/tools/llvm-cov/Inputs/gcov47_compatibility.gcno b/llvm/test/tools/llvm-cov/Inputs/gcov47_compatibility.gcno
new file mode 100644
index 00000000000..90e3bd277a9
--- /dev/null
+++ b/llvm/test/tools/llvm-cov/Inputs/gcov47_compatibility.gcno