[SYCLomatic] Emit error message and fixing steps for users when "cmak…

…e -E make_directory" called in "intercept-build make" (oneapi-src#1391)


Signed-off-by: chenwei.sun <[email protected]>

clang/test/dpct/intercept_cmake_waring/CMakeLists.txt

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.0)
+
+project(foo)
+
+add_executable(foo foo.cpp)

clang/test/dpct/intercept_cmake_waring/Makefile

@@ -0,0 +1,12 @@
+program = main
+
+
+main: foo.cpp
+	mkdir -p build
+	cd build && cmake .. && make
+
+clean:
+	rm -rf build foo.o
+
+run: $(program)
+	./$(program)

clang/test/dpct/intercept_cmake_waring/foo.cpp

@@ -0,0 +1,15 @@
+// UNSUPPORTED: system-windows
+// intercept-build only supports Linux
+//
+// ------ prepare test directory
+// RUN: cd %T
+// RUN: cp %s foo.cpp
+// RUN: cp %S/Makefile ./Makefile
+// RUN: cp %S/CMakeLists.txt ./CMakeLists.txt
+// RUN: not intercept-build make > intercept_log.txt 2>&1 || true
+// RUN: not grep "cmake is called to generate project build" ./intercept_log.txt
+#include <iostream>
+
+int main() {
+  return 0;
+}

clang/tools/scan-build-py/lib/libear/ear.c

@@ -1589,6 +1589,42 @@ const char *find_intercept_compiler(const char *str, int compiler_idx) {
   return ret;
 }
 
+void emit_cmake_warning(char const *argv[], int argc) {
+  const char *bin = argv[0];
+  int len = strlen(bin);
+  if ((len == 5 && bin[0] == 'e' && bin[1] == 'k' && bin[3] == 'a' &&
+       bin[4] == 'm' && bin[4] == 'c') ||
+      (len > 5 && bin[len - 6] == '/' && bin[len - 5] == 'c' &&
+       bin[len - 4] == 'm') &&
+          bin[len - 3] == 'a' && bin[len - 2] == 'k' && bin[len - 1] == 'e') {
+
+    int find_make_directory = 0;
+    for (size_t i = 0; i < argc; i++) {
+      // if cmake runs with option "make_directory", like "/usr/bin/cmake  -E
+      // make_directory  /path/to/build/_deps/foo-src", it means that cmake
+      // configure is run in this directory.
+      if (strcmp(argv[i], "make_directory") == 0) {
+        find_make_directory = 1;
+        break;
+      }
+    }
+
+    static int print_once = 0;
+    if (find_make_directory && !print_once) {
+      perror(
+          "[intercept-build: Error]: cmake is called to generate project build "
+          "scripts when run \"intercept-build make\", the build scripts "
+          "generated may not be complete. To generate a complete compilation "
+          "database, suggest following steps:\n"
+          "1. Build the source project by running \"make -B\" in build "
+          "folder.\n"
+          "2. Run \"intercept-build make -B\" to generate compilation database "
+          "in build folder.\n");
+    }
+    print_once++;
+  }
+}
+
 // Replace the command compiler with path to command "intercept-stub" with path.
 // src could be:"/path/to/clang++",
 //                 "/path/to/clang++ -Xcompiler ...",
@@ -1720,6 +1756,9 @@ static void bear_report_call(char const *fun, char const *const argv[]) {
   fprintf(fd, "%s%c", cwd, RS);
   size_t const argc = bear_strings_length(argv);
 #ifdef SYCLomatic_CUSTOMIZATION
+
+  emit_cmake_warning(argv, argc);
+
   // compiler list should be intercepted.
   const char *const compiler_array[] = {"nvcc", "clang++"};
   // Current compiler index intercepted.