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x11-drivers/nvidia-drivers: add basic clang+thinlto kernel support

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Only adding this experimental support to >=465.31, still very little
testing has been done but should be better than always failing.

To use this there's no need to do anything beside having a kernel
built with clang+(thin)lto (normally through LLVM=1 LLVM_IAS=1).
Note to not set "LD" as it'll currently fail with USE=tools for
other reasons.

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>
This commit is contained in:
Ionen Wolkens
2021-06-11 12:57:43 -04:00
parent 9560eb198a
commit 9cca413557
1 changed files with 19 additions and 3 deletions
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22
x11-drivers/nvidia-drivers/nvidia-drivers-465.31.ebuild
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@@ -101,8 +101,6 @@ pkg_setup() {
Cannot be directly selected in the kernel's menuconfig, so enable
options such as CONFIG_DRM_FBDEV_EMULATION instead."
BUILD_PARAMS='NV_VERBOSE=1 IGNORE_CC_MISMATCH=yes SYSSRC="${KV_DIR}" SYSOUT="${KV_OUT_DIR}"'
BUILD_TARGETS="modules" # defaults' clean sometimes deletes modules
MODULE_NAMES="
nvidia(video:kernel)
nvidia-drm(video:kernel)
@@ -112,7 +110,25 @@ pkg_setup() {
linux-mod_pkg_setup
if [[ ${MERGE_TYPE} != binary ]] && kernel_is -gt ${NV_KERNEL_MAX/./ }; then
[[ ${MERGE_TYPE} == binary ]] && return
BUILD_PARAMS='NV_VERBOSE=1 IGNORE_CC_MISMATCH=yes SYSSRC="${KV_DIR}" SYSOUT="${KV_OUT_DIR}"'
BUILD_TARGETS="modules" # defaults' clean sometimes deletes modules
if linux_chkconfig_present CC_IS_CLANG; then
ewarn "Warning: building ${PN} with a clang-built kernel is experimental."
BUILD_PARAMS+=' CC=${CHOST}-clang'
if linux_chkconfig_present LD_IS_LLD; then
BUILD_PARAMS+=' LD=ld.lld'
if linux_chkconfig_present LTO_CLANG_THIN; then
# kernel enables cache by default leading to sandbox violations
BUILD_PARAMS+=' ldflags-y=--thinlto-cache-dir= LDFLAGS_MODULE=--thinlto-cache-dir='
fi
fi
fi
if kernel_is -gt ${NV_KERNEL_MAX/./ }; then
ewarn "Kernel ${KV_MAJOR}.${KV_MINOR} is either known to break this version of nvidia-drivers"
ewarn "or was not tested with it. It is recommended to use one of:"
ewarn " <=sys-kernel/gentoo-kernel-${NV_KERNEL_MAX}"