[llvm-cov] Assume repeat architectures for universal binaries

In the case you pass multiple universal binaries to llvm-cov, assume
that if only 1 architecture is passed, it should be used for all the
passed binaries.

This makes it easier to use multiple multi-arch binaries, since it's
likely very rare that your architectures mismatch significantly if you
also have multiple binaries in a single llvm-cov invocation. If the
architecture is invalid for any of the passed binaries, it will still
fail later.

Differential Revision: https://reviews.llvm.org/D121667

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/tools/llvm-cov/CodeCoverage.cpp b/llvm/tools/llvm-cov/CodeCoverage.cpp
index 33874e3..b333f7f 100644
--- a/llvm/tools/llvm-cov/CodeCoverage.cpp
+++ b/llvm/tools/llvm-cov/CodeCoverage.cpp
@@ -883,6 +883,9 @@ int CodeCoverageTool::run(Command Cmd, int argc, const char **argv) {
         }
         CoverageArches.emplace_back(Arch);
       }
+      if (CoverageArches.size() == 1)
+        CoverageArches.insert(CoverageArches.end(), ObjectFilenames.size() - 1,
+                              CoverageArches[0]);
       if (CoverageArches.size() != ObjectFilenames.size()) {
         error("Number of architectures doesn't match the number of objects");
         return 1;