WIP: CMake (#3326)

* More robust input and output selection in generator tools

* Add cmake build system

* Get slang-test running with cmake

* Bump lz4 and miniz dependencies

* Make cmake build more declarative

* Correct preprocessor logic in slang.h

* Add cuda test to compute/simple

* Remove empty cmake files

* output placement for cmake, and commenting

* Correct include paths in spirv-embed-generator

* Format cmake with gersemi

* Make cmake build clerer

* Neaten header generation

Also work around https://gitlab.kitware.com/cmake/cmake/-/issues/18399
by introducing correct_generated_properties to set the GENERATED flag in
the correct scope

* remove unused files

* use 3.20 to set GENERATOR property properly

* spelling

* more flexible linker arg setting

* replace slang-static with obj collection

* Set rpath and linker path correctly

* neaten generated file generation

* tests working with cmake build

* fix premake5 build

* comment and neaten cmake

* remove unnecessary dependency

* Build aftermath example only when aftermath is enabled

* Add slang-llvm and other dependencies

* Put modules alongside binaries

* Find slang-glslang correctly

* Better option handling

* comments

* add llvm build test

* Better option handling

* cmake wobble

* use UNICODE and _UNICODE

* remove other workflows

* use ccache

* neaten

* limit parallel for llvm build

* use ninja for build

* Windows and Darwin slang-llvm builds

* cache key

* verbose llvm build

* cl on windows

* sccache and cl.exe

* use cl.exe

* Correct package detection

* less verbosity

* Simplify miniz inclusion

* fix build with sccache

* Neaten llvm building

* neaten

* Neaten slang-llvm fetching

* more surgical workarounds

* Add ci action

* Get version from git

* better variable naming

* add missing include

* clean up after premake in cmake

* more docs on cmake build

* ci wobble

* add imgui target

* more selective source

* do not download swiftshader

* Some missing dependencies

* only build llvm on dispatch

* Disable /Zi in CI where sccache is present

* simplify

* set PIC for miniz

* set policies before project

* reengage workaround

* more runs on ci

* Add cmake presets

* Add cpack

* move iterator debug level to preset

* Correct lib flag

* simplify action

* Neaten cmake init

* Add todo

* Add simple test wrapper

* Add tests to workflow presets

* rename packing preset

* Correctly set definitions

* docs

* correct preset names

* Make slang-test depend on test-server/test-process

* neaten

* use workflow in actions

* install docs

* Correct module install dir

* debug dist workflow

* Install headers

* neaten header globbing

* Neaten dependency handling

* make lib and bin variables

* Do not set compiler for vs builds, unnecessary

* docs

* allow setting explicit source for target

* maintain archive subdir

* cmake docs

* install headers

* place targets into folders

* cmake docs

* nest external projects in folder

* remove name clash

* Neater external packages

* meta targets in folder structure

* cleaner slang-glslang dll

* Add missing static directive to slang-no-embedded-stdlib

* more robust module copying

* make slang-test the startup project

* folder tweak

* Make FETCH_BINARY the default on all platforms

* Set DEBUG_DIR

* add natvis files to source

* skip spirv tests

* remove test step from debug dist

* Add build to .gitignore

* redo warnings to be more like premake

* Update imgui

* clean more premake files

* Disable PCH for glslang, gcc throws a warning

* Add /MP for msvc builds

* warning wobble

* Add script to build llvm

* Add slang-llvm and generators components

* Build slang-llvm in ci

* comments

* fetch llvm with git

* better abi approximation for cache

* better sccache key

* formatting

* Correct logic around disabling problematic debug info for ccache

* exclude gcc and clang from windows ci

* Make dist workflows use system llvm

* naming

* restore normal dist builds

* formatting

* run tests in ci

* Correct slang-llvm url setting

* Rely on the system to find the test tool library

* actions matrix wiggle

* cope with OSX ancient bash

* Correct compilers on windows

* more ci debugging

* Correct rpath handling on OSX

* neaten

* correct path to slang-llvm

* Correct rpath separator on osx

* Find slang-llvm correctly

* smoke tests only on osx

* ci wobble

* Give MacOS module a dylib suffix

* get swiftshader correctly

* cope with bsd cp

* remove debug output

* full tests on osx

* ci wobble

* Add some vk tests to expected failures

* simplify ci

* ci wobble

* exclude dx12 tests from github ci

* remove cmake code for building llvm

* warnings

* warnings as errors for cl

* spirv-tools in path

* add aarch64 ci build

* Add SLANG_GENERATORS_PATH option for prebuilt generators

* neaten

* Correct generator target name

* remove yaml anchors because github actions does not support them

* Demote CMake in docs

Also add info on cross compiling

* Restore premake CI

* use minimal ci for cmake

* Write miniz_export for premake build

and .gitignore it

* Mention build config tool options in docs

* Remove redefined macro for miniz

* regenerate vs project

1 files changed, 38 insertions, 8 deletions

diff --git a/tools/slang-generate/main.cpp b/tools/slang-generate/main.cpp
index af81385dd..d84e594e8 100644
--- a/tools/slang-generate/main.cpp
+++ b/tools/slang-generate/main.cpp
@@ -697,7 +697,7 @@ void emitTemplateNodes(
 
 void usage(char const* appName)
 {
-    fprintf(stderr, "usage: %s <input>\n", appName);
+    fprintf(stderr, "usage: %s [FILE]... [--target-directory FILE]\n", appName);
 }
 
 SlangResult readAllText(char const * fileName, String& outString)
@@ -804,6 +804,11 @@ SourceFile* parseSourceFile(const String& path)
 {
     FILE* inputStream;
     fopen_s(&inputStream, path.getBuffer(), "rb");
+    if(!inputStream)
+    {
+        fprintf(stderr, "unable to read input file: %s\n", path.getBuffer());
+        return nullptr;
+    }
     fseek(inputStream, 0, SEEK_END);
     size_t inputSize = ftell(inputStream);
     fseek(inputStream, 0, SEEK_SET);
@@ -845,6 +850,7 @@ int main(
 {
     // Parse command-line arguments.
     List<String> inputPaths;
+    String outputDir;
     char const* appName = "slang-generate";
 
     {
@@ -855,12 +861,27 @@ int main(
         {
             appName = *argCursor++;
         }
-        // Copy the input paths
+        // Parse arguments
         for (; argCursor != argEnd; ++argCursor)
         {
-            // We simplify here because doing so also means paths separators are set to /
-            // and that makes path emitting work correctly
-            inputPaths.add(Path::simplify(UnownedStringSlice(*argCursor)));
+            const auto arg = UnownedStringSlice(*argCursor);
+            if(arg == "--target-directory")
+            {
+                argCursor++;
+                if(argCursor == argEnd)
+                {
+                    usage(appName);
+                    fprintf(stderr, "--target-directory expects an argument\n");
+                    exit(1);
+                }
+                outputDir = Path::simplify(UnownedStringSlice(*argCursor));
+            }
+            else
+            {
+                // We simplify here because doing so also means paths separators are set to /
+                // and that makes path emitting work correctly
+                inputPaths.add(Path::simplify(arg));
+            }
         }
     }
 
@@ -875,9 +896,15 @@ int main(
     for (auto& inputPath: inputPaths)
     {
         SourceFile* sourceFile = parseSourceFile(inputPath);
-        if (sourceFile)
+        gSourceFiles.add(sourceFile);
+    }
+
+    for (auto sourceFile : gSourceFiles)
+    {
+        if(!sourceFile)
         {
-            gSourceFiles.add(sourceFile);
+            fprintf(stderr, "failed to parse source files\n");
+            exit(1);
         }
     }
 
@@ -901,7 +928,10 @@ int main(
 
         // update final output only when content has changed
         StringBuilder outputPathFinal;
-        outputPathFinal << inputPath << ".h";
+        if(outputDir.getLength())
+            outputPathFinal << outputDir << "/" << Slang::Path::getFileName(inputPath) << ".h";
+        else
+            outputPathFinal << inputPath << ".h";
 
         String allTextOld, allTextNew;
         readAllText(outputPathFinal.getBuffer(), allTextOld);