ci: unbreak CI for OIIO auto-build of OCIO for icx case (#1849)

Some explanation is needed:

OIIO master recently added the ability to auto-build OCIO when a new
enough one is not found at its build time, and bumped the minimum OCIO
to 2.2.

Sometimes this is triggered by OSL's CI, when OCIO < 2.2, so building
OIIO also triggers building of OCIO.

All fine, except for the case when we are testing Intel's icx
compiler, which OCIO's build system does not recognize and fails to
build. So we make a little modification here that lets us, just for
that case, ensure that OCIO is pre-built with gcc even though we're
building OIIO and OSL with icx.

Signed-off-by: Larry Gritz <[email protected]>

Author: lgritz

.github/workflows/ci.yml

@@ -147,6 +147,7 @@ jobs:
             simd: avx2,f16c
             batched: b8_AVX2_noFMA
             setenvs: export OSL_CMAKE_FLAGS="-DSTOP_ON_WARNING=OFF" USE_OPENVDB=0
+                            OPENCOLORIO_VERSION=v2.3.2 OPENCOLORIO_CXX=g++
           - desc: gcc11/C++17 llvm15 py3.10 boost1.80 exr3.1 oiio-rel avx2
             nametag: linux-vfx2023
             runner: ubuntu-latest

src/build-scripts/build_opencolorio.bash

@@ -19,6 +19,7 @@ OPENCOLORIO_SOURCE_DIR=${OPENCOLORIO_SOURCE_DIR:=${LOCAL_DEPS_DIR}/OpenColorIO}
 OPENCOLORIO_BUILD_DIR=${OPENCOLORIO_BUILD_DIR:=${LOCAL_DEPS_DIR}/OpenColorIO-build}
 OPENCOLORIO_INSTALL_DIR=${OPENCOLORIO_INSTALL_DIR:=${LOCAL_DEPS_DIR}/dist}
 OPENCOLORIO_BUILD_TYPE=${OPENCOLORIO_BUILD_TYPE:=Release}
+OPENCOLORIO_CXX=${OPENCOLORIO_CXX:=g++}
 OPENCOLORIO_CXX_FLAGS=${OPENCOLORIO_CXX_FLAGS:="-Wno-unused-function -Wno-deprecated-declarations -Wno-cast-qual -Wno-write-strings"}
 # Just need libs:
 OPENCOLORIO_BUILDOPTS="-DOCIO_BUILD_APPS=OFF -DOCIO_BUILD_NUKE=OFF \
@@ -48,6 +49,7 @@ echo "Building OpenColorIO from commit" `git rev-parse --short HEAD`
 time cmake -S . -B ${OPENCOLORIO_BUILD_DIR} \
            -DCMAKE_BUILD_TYPE=${OPENCOLORIO_BUILD_TYPE} \
            -DCMAKE_INSTALL_PREFIX=${OPENCOLORIO_INSTALL_DIR} \
+           -DCMAKE_CXX_COMPILER=${OPENCOLORIO_CXX} \
            -DCMAKE_CXX_FLAGS="${OPENCOLORIO_CXX_FLAGS}" \
            ${OPENCOLORIO_BUILDOPTS}
 time cmake --build ${OPENCOLORIO_BUILD_DIR} --config Release --target install