8 files changed, 198 insertions, 0 deletions
diff --git a/Tests/CMakeLib/CMakeLists.txt b/Tests/CMakeLib/CMakeLists.txt
index 25d2de6..bb50d76 100644
--- a/Tests/CMakeLib/CMakeLists.txt
+++ b/Tests/CMakeLib/CMakeLists.txt
@@ -11,6 +11,7 @@ set(CMakeLib_TESTS
   testCTestResourceAllocator.cxx
   testCTestResourceSpec.cxx
   testCTestResourceGroups.cxx
+  testGccDepfileReader.cxx
   testGeneratedFileStream.cxx
   testRST.cxx
   testRange.cxx
@@ -35,6 +36,7 @@ set(testRST_ARGS ${CMAKE_CURRENT_SOURCE_DIR})
 set(testUVProcessChain_ARGS $<TARGET_FILE:testUVProcessChainHelper>)
 set(testUVStreambuf_ARGS $<TARGET_FILE:cmake>)
 set(testCTestResourceSpec_ARGS ${CMAKE_CURRENT_SOURCE_DIR})
+set(testGccDepfileReader_ARGS ${CMAKE_CURRENT_SOURCE_DIR})
 
 if(WIN32)
   list(APPEND CMakeLib_TESTS
diff --git a/Tests/CMakeLib/testGccDepfileReader.cxx b/Tests/CMakeLib/testGccDepfileReader.cxx
new file mode 100644
index 0000000..924d87b
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader.cxx
@@ -0,0 +1,131 @@
+#include <cstddef>
+#include <iostream>
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "cmsys/FStream.hxx"
+
+#include "cmGccDepfileReader.h"
+#include "cmGccDepfileReaderTypes.h" // for cmGccDepfileContent, cmGccStyle...
+#include "cmSystemTools.h"
+
+namespace {
+
+cmGccDepfileContent readPlainDepfile(const char* filePath)
+{
+  cmGccDepfileContent result;
+  cmsys::ifstream is(filePath);
+  if (!is.is_open())
+    return result;
+  std::string line;
+
+  cmGccStyleDependency dep;
+  bool readingRules = true;
+  while (cmSystemTools::GetLineFromStream(is, line)) {
+    if (line == "--RULES--") {
+      if (!dep.rules.empty()) {
+        result.push_back(std::move(dep));
+        dep = cmGccStyleDependency();
+      }
+      readingRules = true;
+    } else if (line == "--DEPENDENCIES--") {
+      readingRules = false;
+    } else {
+      std::vector<std::string>& dst = readingRules ? dep.rules : dep.paths;
+      dst.push_back(std::move(line));
+      line = std::string();
+    }
+  }
+
+  if (!dep.rules.empty()) {
+    result.push_back(std::move(dep));
+  }
+
+  return result;
+}
+
+bool compare(const std::vector<std::string>& actual,
+             const std::vector<std::string>& expected, const char* msg)
+{
+  if (actual.size() != expected.size()) {
+    std::cerr << msg << "expected " << expected.size() << " entries."
+              << std::endl
+              << "Actual number of entries: " << actual.size() << std::endl;
+    return false;
+  }
+  for (std::size_t i = 0; i < actual.size(); ++i) {
+    if (actual[i] != expected[i]) {
+      std::cerr << msg << std::endl
+                << "expected: " << expected[i] << std::endl
+                << "actual: " << actual[i] << std::endl;
+      return false;
+    }
+  }
+  return true;
+}
+
+bool compare(const cmGccDepfileContent& actual,
+             const cmGccDepfileContent& expected)
+{
+  if (actual.size() != expected.size()) {
+    std::cerr << "Expected " << expected.size() << " entries." << std::endl
+              << "Actual number of entries: " << actual.size() << std::endl;
+    return false;
+  }
+  for (std::size_t i = 0; i < actual.size(); ++i) {
+    if (!compare(actual[i].rules, expected[i].rules, "Rules differ: ") ||
+        !compare(actual[i].paths, expected[i].paths, "Paths differ: ")) {
+      return false;
+    }
+  }
+  return true;
+}
+
+void dump(const char* label, const cmGccDepfileContent& dfc)
+{
+  std::cerr << label << std::endl;
+  for (const auto& entry : dfc) {
+    auto rit = entry.rules.cbegin();
+    if (rit != entry.rules.cend()) {
+      std::cerr << *rit;
+      for (++rit; rit != entry.rules.cend(); ++rit) {
+        std::cerr << "  " << *rit;
+      }
+      std::cerr << ": " << std::endl;
+    }
+    for (const auto& path : entry.paths) {
+      std::cerr << "    " << path << std::endl;
+    }
+  }
+}
+
+} // anonymous namespace
+
+int testGccDepfileReader(int argc, char* argv[])
+{
+  if (argc < 2) {
+    std::cout << "Invalid arguments.\n";
+    return -1;
+  }
+
+  std::string dataDirPath = argv[1];
+  dataDirPath += "/testGccDepfileReader_data";
+  const int numberOfTestFiles = 3;
+  for (int i = 1; i <= numberOfTestFiles; ++i) {
+    const std::string base = dataDirPath + "/deps" + std::to_string(i);
+    const std::string depfile = base + ".d";
+    const std::string plainDepfile = base + ".txt";
+    std::cout << "Comparing " << base << " with " << plainDepfile << std::endl;
+    const auto actual = cmReadGccDepfile(depfile.c_str());
+    const auto expected = readPlainDepfile(plainDepfile.c_str());
+    if (!compare(actual, expected)) {
+      dump("actual", actual);
+      dump("expected", expected);
+      return 1;
+    }
+  }
+
+  return 0;
+}
diff --git a/Tests/CMakeLib/testGccDepfileReader_data/deps1.d b/Tests/CMakeLib/testGccDepfileReader_data/deps1.d
new file mode 100644
index 0000000..9e34863
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader_data/deps1.d
@@ -0,0 +1,20 @@
+main.o: main.cpp /usr/include/stdc-predef.h /usr/include/stdio.h \
+ /usr/include/x86_64-linux-gnu/bits/libc-header-start.h \
+ /usr/include/features.h /usr/include/x86_64-linux-gnu/sys/cdefs.h \
+ /usr/include/x86_64-linux-gnu/bits/wordsize.h \
+ /usr/include/x86_64-linux-gnu/bits/long-double.h \
+ /usr/include/x86_64-linux-gnu/gnu/stubs.h \
+ /usr/include/x86_64-linux-gnu/gnu/stubs-64.h \
+ /usr/lib/gcc/x86_64-linux-gnu/8/include/stddef.h \
+ /usr/lib/gcc/x86_64-linux-gnu/8/include/stdarg.h \
+ /usr/include/x86_64-linux-gnu/bits/types.h \
+ /usr/include/x86_64-linux-gnu/bits/typesizes.h \
+ /usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h \
+ /usr/include/x86_64-linux-gnu/bits/types/__mbstate_t.h \
+ /usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h \
+ /usr/include/x86_64-linux-gnu/bits/types/__FILE.h \
+ /usr/include/x86_64-linux-gnu/bits/types/FILE.h \
+ /usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h \
+ /usr/include/x86_64-linux-gnu/bits/types/cookie_io_functions_t.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio_lim.h \
+ /usr/include/x86_64-linux-gnu/bits/sys_errlist.h
diff --git a/Tests/CMakeLib/testGccDepfileReader_data/deps1.txt b/Tests/CMakeLib/testGccDepfileReader_data/deps1.txt
new file mode 100644
index 0000000..fd2679f
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader_data/deps1.txt
@@ -0,0 +1,26 @@
+--RULES--
+main.o
+--DEPENDENCIES--
+main.cpp
+/usr/include/stdc-predef.h
+/usr/include/stdio.h
+/usr/include/x86_64-linux-gnu/bits/libc-header-start.h
+/usr/include/features.h
+/usr/include/x86_64-linux-gnu/sys/cdefs.h
+/usr/include/x86_64-linux-gnu/bits/wordsize.h
+/usr/include/x86_64-linux-gnu/bits/long-double.h
+/usr/include/x86_64-linux-gnu/gnu/stubs.h
+/usr/include/x86_64-linux-gnu/gnu/stubs-64.h
+/usr/lib/gcc/x86_64-linux-gnu/8/include/stddef.h
+/usr/lib/gcc/x86_64-linux-gnu/8/include/stdarg.h
+/usr/include/x86_64-linux-gnu/bits/types.h
+/usr/include/x86_64-linux-gnu/bits/typesizes.h
+/usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h
+/usr/include/x86_64-linux-gnu/bits/types/__mbstate_t.h
+/usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h
+/usr/include/x86_64-linux-gnu/bits/types/__FILE.h
+/usr/include/x86_64-linux-gnu/bits/types/FILE.h
+/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h
+/usr/include/x86_64-linux-gnu/bits/types/cookie_io_functions_t.h
+/usr/include/x86_64-linux-gnu/bits/stdio_lim.h
+/usr/include/x86_64-linux-gnu/bits/sys_errlist.h
diff --git a/Tests/CMakeLib/testGccDepfileReader_data/deps2.d b/Tests/CMakeLib/testGccDepfileReader_data/deps2.d
new file mode 100644
index 0000000..25f0d78
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader_data/deps2.d
@@ -0,0 +1 @@
+foo.o bar.o: foobar.c
diff --git a/Tests/CMakeLib/testGccDepfileReader_data/deps2.txt b/Tests/CMakeLib/testGccDepfileReader_data/deps2.txt
new file mode 100644
index 0000000..afaf78e
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader_data/deps2.txt
@@ -0,0 +1,5 @@
+--RULES--
+foo.o
+bar.o
+--DEPENDENCIES--
+foobar.c
diff --git a/Tests/CMakeLib/testGccDepfileReader_data/deps3.d b/Tests/CMakeLib/testGccDepfileReader_data/deps3.d
new file mode 100644
index 0000000..d75ceed
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader_data/deps3.d
@@ -0,0 +1,2 @@
+main.o: main.cpp foo\#bar.h foo\\#bar.h foo\ bar.h \
+ foo\\\ bar.h foo\\\\\ bar.h foo\\\\ foo$$bar.h
diff --git a/Tests/CMakeLib/testGccDepfileReader_data/deps3.txt b/Tests/CMakeLib/testGccDepfileReader_data/deps3.txt
new file mode 100644
index 0000000..448f69c
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader_data/deps3.txt
@@ -0,0 +1,11 @@
+--RULES--
+main.o
+--DEPENDENCIES--
+main.cpp
+foo#bar.h
+foo\#bar.h
+foo bar.h
+foo\ bar.h
+foo\\ bar.h
+foo\\\\
+foo$bar.h