Skip to content

[PS5] Enable support for DTLTO in the PS5 Clang driver #158041

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
Sep 16, 2025
Merged

[PS5] Enable support for DTLTO in the PS5 Clang driver #158041

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
5575350
[PS5] Enable support for DTLTO in the PS5 Clang driver
bd1976bris Sep 11, 2025
44fdeb9
Improve loop over getAllArgValues
bd1976bris Sep 11, 2025
6fa31fd
Remove the addLTOOptions as it is unrelated to the purpose of this PR.
bd1976bris Sep 16, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
12 changes: 12 additions & 0 deletions clang/lib/Driver/ToolChains/PS4CPU.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -343,6 +343,18 @@ void tools::PS5cpu::Linker::ConstructJob(Compilation &C, const JobAction &JA,
// whether or not that will be the case at this point. So, unconditionally
// pass LTO options to ensure proper codegen, metadata production, etc if
// LTO indeed occurs.

if (const Arg *A = Args.getLastArg(options::OPT_fthinlto_distributor_EQ)) {
CmdArgs.push_back(
Args.MakeArgString("--thinlto-distributor=" + Twine(A->getValue())));
CmdArgs.push_back(Args.MakeArgString("--thinlto-remote-compiler=" +
Twine(D.getClangProgramPath())));

for (const auto &A :
Args.getAllArgValues(options::OPT_Xthinlto_distributor_EQ))
CmdArgs.push_back(Args.MakeArgString("--thinlto-distributor-arg=" + A));
}

if (Args.hasFlag(options::OPT_funified_lto, options::OPT_fno_unified_lto,
true))
CmdArgs.push_back(D.getLTOMode() == LTOK_Thin ? "--lto=thin"
Expand Down
45 changes: 45 additions & 0 deletions clang/test/Driver/DTLTO/ps5-dtlto.c
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,45 @@
// REQUIRES: lld

/// Check DTLTO options are forwarded to the linker.

/// Check that options are forwarded as expected with --thinlto-distributor=.
// RUN: %clang -flto=thin %s -### --target=x86_64-sie-ps5 \
// RUN: -Xthinlto-distributor=a1 -Xthinlto-distributor=a2,a3 \
// RUN: -fthinlto-distributor=d.exe -Werror 2>&1 | \
// RUN: FileCheck %s --check-prefix=FORWARD

// FORWARD: prospero-lld
// FORWARD-SAME: "--thinlto-distributor=d.exe"
// FORWARD-SAME: "--thinlto-remote-compiler={{[^"]+}}"
// FORWARD-SAME: "--thinlto-distributor-arg=a1"
// FORWARD-SAME: "--thinlto-distributor-arg=a2"
// FORWARD-SAME: "--thinlto-distributor-arg=a3"

/// Check that options are not added without --thinlto-distributor= and
/// that a warning is issued for unused -Xthinlto-distributor options.
// RUN: %clang -flto=thin %s -### --target=x86_64-sie-ps5 \
// RUN: -Xthinlto-distributor=a1 -Xthinlto-distributor=a2,a3 2>&1 | \
// RUN: FileCheck %s --check-prefix=NODIST --implicit-check-not=distributor \
// RUN: --implicit-check-not=remote-compiler

// NODIST: warning: argument unused during compilation: '-Xthinlto-distributor=a1'
// NODIST: warning: argument unused during compilation: '-Xthinlto-distributor=a2,a3'
// NODIST: prospero-lld

/// Check the expected arguments are forwarded by default with only
/// --thinlto-distributor=.
// RUN: %clang -flto=thin %s -### --target=x86_64-sie-ps5 \
// RUN: -fthinlto-distributor=d.exe -Werror 2>&1 | \
// RUN: FileCheck %s --check-prefix=DEFAULT --implicit-check-not=distributor \
// RUN: --implicit-check-not=remote-compiler

// DEFAULT: prospero-lld
// DEFAULT-SAME: "--thinlto-distributor=d.exe"
// DEFAULT-SAME: "--thinlto-remote-compiler={{.*}}clang{{[^\"]*}}"

/// Check that the arguments are forwarded unconditionally even when the
/// compiler is not in LTO mode.
Comment on lines +40 to +41
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Will "unused argument" warnings be produced, and should we check for them?

Copy link
Collaborator Author

@bd1976bris bd1976bris Sep 11, 2025 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

No. Unlike most drivers we consume the arguments even if we are not in LTO mode (-flto is not specified). -Xthinlto-distributor= arguments are not consumed if '-fthinlto-distributor=' is not supplied but we check for that on line 25 of this test. These arguments are not consumed if we are not linking e.g. -c is specified, but that's in common with all the arguments that are processed here in Linker::ConstructJob.

// RUN: %clang %s -### --target=x86_64-sie-ps5 \
// RUN: -fthinlto-distributor=d.exe -Werror 2>&1 | \
// RUN: FileCheck %s --check-prefix=DEFAULT --implicit-check-not=distributor \
// RUN: --implicit-check-not=remote-compiler