selfcheck.sh: also run with system includes made available

.github/workflows/CI-unixish.yml

@@ -36,10 +36,10 @@ jobs:
           sudo apt-get install valgrind
 
     - name: Install missing software on ubuntu (clang++)
-      if: matrix.os == 'ubuntu-24.04' && matrix.compiler == 'clang++'
+      if: contains(matrix.os, 'ubuntu') && matrix.compiler == 'clang++'
       run: |
         sudo apt-get update
-        sudo apt-get install libc++-18-dev
+        sudo apt-get install libc++-dev
 
       # coreutils contains "nproc"
     - name: Install missing software on macos

Makefile

@@ -22,7 +22,7 @@ test:	testrunner	simplecpp
 	python3 -m pytest integration_test.py -vv
 
 selfcheck:	simplecpp
-	./selfcheck.sh
+	CXX=$(CXX) ./selfcheck.sh
 
 simplecpp:	main.o simplecpp.o
 	$(CXX) $(LDFLAGS) main.o simplecpp.o -o simplecpp

main.cpp

@@ -43,6 +43,11 @@ int main(int argc, char **argv)
             }
             case 'I': { // include path
                 const char * const value = arg[2] ? (argv[i] + 2) : argv[++i];
+                std::ifstream f(value);
+                if (!f.is_open()) {
+                    std::cout << "error: include path '" << value << "' does not exist" << std::endl;
+                    std::exit(1);
+                }
                 dui.includePaths.push_back(value);
                 found = true;
                 break;

selfcheck.sh

@@ -4,8 +4,113 @@ output=$(./simplecpp simplecpp.cpp -e -f 2>&1)
 ec=$?
 errors=$(echo "$output" | grep -v 'Header not found: <')
 if [ $ec -ne 0 ]; then
-  # only fail if got errors which do not refer to missing system includes
+  # only fail if we got errors which do not refer to missing system includes
   if [ ! -z "$errors" ]; then
     exit $ec
   fi
-fi
+fi
+
+if [ -z "$CXX" ]; then
+  exit 0
+fi
+
+cxx_type=$($CXX --version | head -1 | cut -d' ' -f1)
+if [ "$cxx_type" = "Ubuntu" ]; then
+  cxx_type=$($CXX --version | head -1 | cut -d' ' -f2)
+fi
+# TODO: how to get built-in include paths from compiler?
+if [ "$cxx_type" = "g++" ]; then
+  gcc_ver=$($CXX -dumpversion)
+  defs=
+  defs="$defs -D__GNUC__"
+  defs="$defs -D__STDC__"
+  defs="$defs -D__STDC_HOSTED__"
+  defs="$defs -D__CHAR_BIT__=8"
+  defs="$defs -D__x86_64__"
+  defs="$defs -D__has_builtin(x)=(1)"
+  defs="$defs -D__has_cpp_attribute(x)=(1)"
+  defs="$defs -D__has_attribute(x)=(1)"
+  # some required include paths might differ per distro
+  inc=
+  inc="$inc -I/usr/include"
+  inc="$inc -I/usr/include/linux"
+  inc="$inc -I/usr/include/c++/$gcc_ver"
+  if [ -d "/usr/include/c++/$gcc_ver/x86_64-pc-linux-gnu" ]; then
+    inc="$inc -I/usr/include/c++/$gcc_ver/x86_64-pc-linux-gnu"
+  fi
+  if [ -d "/usr/lib/gcc/x86_64-pc-linux-gnu/$gcc_ver/include" ]; then
+    inc="$inc -I/usr/lib/gcc/x86_64-pc-linux-gnu/$gcc_ver/include"
+  fi
+  if [ -d "/usr/lib/gcc/x86_64-linux-gnu/$gcc_ver/include" ]; then
+    inc="$inc -I/usr/lib/gcc/x86_64-linux-gnu/$gcc_ver/include"
+  fi
+  if [ -d "/usr/include/x86_64-linux-gnu" ]; then
+    inc="$inc -I/usr/include/x86_64-linux-gnu"
+    inc="$inc -I/usr/include/x86_64-linux-gnu/c++/$gcc_ver"
+  fi
+  ./simplecpp simplecpp.cpp -e -f -std=gnu++11 $defs $inc
+  ec=$?
+  if [ $ec -ne 0 ]; then
+    exit $ec
+  fi
+elif [ "$cxx_type" = "clang" ]; then
+  clang_ver=$($CXX -dumpversion)
+  clang_ver=${clang_ver%%.*}
+  defs=
+  defs="$defs -D__BYTE_ORDER__"
+  defs="$defs -D__linux__"
+  defs="$defs -D__x86_64__"
+  defs="$defs -D__SIZEOF_SIZE_T__=8"
+  defs="$defs -D__has_feature(x)=(1)"
+  defs="$defs -D__has_extension(x)=(1)"
+  defs="$defs -D__has_attribute(x)=(0)"
+  defs="$defs -D__has_cpp_attribute(x)=(0)"
+  defs="$defs -D__has_include_next(x)=(0)"
+  defs="$defs -D__has_builtin(x)=(1)"
+  # some required include paths might differ per distro
+  inc=
+  if [ -d "/usr/include/c++/v1" ]; then
+    inc="$inc -I/usr/include/c++/v1"
+  fi
+  if [ -d "/usr/lib/llvm-$clang_ver/include/c++/v1" ]; then
+    inc="$inc -I/usr/lib/llvm-$clang_ver/include/c++/v1"
+  fi
+  inc="$inc -I/usr/include"
+  inc="$inc -I/usr/lib/clang/$clang_ver/include"
+  if [ -d "/usr/include/x86_64-linux-gnu" ]; then
+    inc="$inc -I/usr/include/x86_64-linux-gnu"
+  fi
+  ./simplecpp simplecpp.cpp -e -f -std=gnu++11 $defs $inc
+  ec=$?
+  if [ $ec -ne 0 ]; then
+    exit $ec
+  fi
+elif [ "$cxx_type" = "Apple" ]; then
+  xcode_path="/Applications/Xcode_16.4.app"
+  if [ ! -d "$xcode_path" ]; then
+    xcode_path="/Applications/Xcode_15.2.app"
+  fi
+  sdk_path="$xcode_path/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk"
+  defs=
+  defs="$defs -D__BYTE_ORDER__"
+  defs="$defs -D__APPLE__"
+  defs="$defs -D__GNUC__=15"
+  defs="$defs -D__x86_64__"
+  defs="$defs -D__has_feature(x)=(1)"
+  defs="$defs -D__has_extension(x)=(1)"
+  defs="$defs -D__has_attribute(x)=(0)"
+  defs="$defs -D__has_cpp_attribute(x)=(0)"
+  defs="$defs -D__has_include_next(x)=(0)"
+  inc=
+  inc="$inc -I$sdk_path/usr/include/c++/v1"
+  inc="$inc -I$sdk_path/usr/include"
+  inc="$inc -I$sdk_path/usr/include/i386"
+  ./simplecpp simplecpp.cpp -e -f -std=gnu++11 $defs $inc
+  ec=$?
+  if [ $ec -ne 0 ]; then
+    exit $ec
+  fi
+else
+  echo "unknown compiler '$cxx_type'"
+  exit 1
+fi