Adjust CMake for Houdini 20 release

.github/scripts/houdini.py

@@ -91,13 +91,18 @@ def install_sidefx_houdini():
     releases_list = sidefx_service.download.get_daily_builds_list(product=sidefx_product,
                                                                   platform=sidefx_platform,
                                                                   only_production=True)
-    latest_production_release = releases_list[0]
+    # Switch to new gcc version starting with H20
+    for release in releases_list:
+        if release["version"] == "20.0":
+            if not release["platform"].endswith("gcc11.2"):
+                continue
+        latest_production_release = release
+        break
     latest_production_release_download = sidefx_service.download.get_daily_build_download(product='houdini',
                                                                                           version=latest_production_release["version"],
                                                                                           build=latest_production_release["build"],
                                                                                           platform=sidefx_platform)
 
-
     # Download latest production release
     logging.info('Downloading Houdini build {version}.{build}'.format(version=latest_production_release["version"], 
                                                                       build=latest_production_release["build"]))

CMakeLists.txt

@@ -72,7 +72,11 @@ else()
 endif()
 # Houdini
 set(AR_HOUDINI_ROOT $ENV{HFS} CACHE PATH "Houdini install directory")
-set(AR_HOUDINI_LIB_DIR ${AR_HOUDINI_ROOT}/custom/houdini/dsolib)
+if (WIN32)
+    set(AR_HOUDINI_LIB_DIR ${AR_HOUDINI_ROOT}/custom/houdini/dsolib)
+else()
+    set(AR_HOUDINI_LIB_DIR ${AR_HOUDINI_ROOT}/dsolib)
+endif()
 set(AR_HOUDINI_INCLUDE_DIR ${AR_HOUDINI_ROOT}/toolkit/include)
 # Usd
 if (WIN32)
@@ -82,11 +86,26 @@ else()
     set(AR_PXR_LIB_DIR ${AR_HOUDINI_ROOT}/dsolib)
     set(AR_PXR_LIB_PREFIX "pxr_")
 endif()
-
 set(AR_PXR_INCLUDE_DIR ${AR_HOUDINI_INCLUDE_DIR})
 # Python
-set(AR_PYTHON_LIB python3.9)
-set(AR_PYTHON_LIB_NUMBER python39)
+if (WIN32)
+    if(EXISTS "${AR_HOUDINI_ROOT}/python310")
+        set(AR_PYTHON_LIB python3.10)
+        set(AR_PYTHON_LIB_NUMBER python310)
+    else()
+        set(AR_PYTHON_LIB python3.9)
+        set(AR_PYTHON_LIB_NUMBER python39)
+    endif()
+else()
+    if(EXISTS "${AR_HOUDINI_ROOT}/python/bin/python3.10")
+        set(AR_PYTHON_LIB python3.10)
+        set(AR_PYTHON_LIB_NUMBER python310)
+    else()
+        set(AR_PYTHON_LIB python3.9)
+        set(AR_PYTHON_LIB_NUMBER python39)
+    endif()
+endif()
+
 if (WIN32)
     set(AR_PYTHON_LIB_DIR ${AR_HOUDINI_ROOT}/${AR_PYTHON_LIB_NUMBER}/libs)
     set(AR_PYTHON_LIB_SITEPACKAGES ${AR_HOUDINI_ROOT}/${AR_PYTHON_LIB_NUMBER}/lib/site-packages)
@@ -111,9 +130,14 @@ project(${AR_PROJECT_NAME} VERSION 1.0.0 LANGUAGES CXX)
 ### CPP Settings ###
 set(BUILD_SHARED_LIBS ON)
 # Preprocessor Defines (Same as #define)
-add_compile_definitions(_GLIBCXX_USE_CXX11_ABI=0 HBOOST_ALL_NO_LIB BOOST_ALL_NO_LIB)
+add_compile_definitions(HBOOST_ALL_NO_LIB BOOST_ALL_NO_LIB)
 if (WIN32)
     add_compile_definitions(NOMINMAX)
+else()
+    # Notes:
+    # Houdini 20 - Switched to the new C++11 ABI for Linux https://www.sidefx.com/docs/houdini/news/20/platforms.html
+    # For Houdini versions that use gcc 9.3, please set this to _GLIBCXX_USE_CXX11_ABI=0
+    add_compile_definitions(_GLIBCXX_USE_CXX11_ABI=1)
 endif()
 # Compiler Options
 # This is the same as set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DHBOOST_ALL_NO_LIB -D_GLIBCXX_USE_CXX11_ABI=0")

docs/src/installation/building.md

@@ -36,6 +36,17 @@ set RESOLVER_NAME=fileResolver
 ## Running the build
 To run the build, run:
 
+~~~admonish warning title="Houdini GCC ABI Change"
+Starting with Houdini 20, SideFX is offering gcc 11 builds. Our automatic builds use this version.
+If you still want to use gcc 9, then you'll have to set the below in our main CMakeLists.txt file.
+See the official [Release Notes](https://www.sidefx.com/docs/houdini/news/20/platforms.html) for more information.
+```bash
+    ...
+    add_compile_definitions(_GLIBCXX_USE_CXX11_ABI=0)
+    ...
+```
+~~~
+
 ~~~admonish info title=""
 ```bash
 # Linux

setup.sh

@@ -8,7 +8,7 @@ then
     export RESOLVER_NAME=cachedResolver
     export RESOLVER_NAME_UPPERCASE=$(echo ${RESOLVER_NAME} | tr '[:lower:]' '[:upper:]')
     # Source Houdini (This defines what Houdini version to compile against)
-    pushd /opt/hfs19.5 > /dev/null
+    pushd /opt/hfs20.0 > /dev/null
     source houdini_setup
     popd > /dev/null
     export HOUDINI_LMINFO_VERBOSE=1