Skip to content

[Driver] -fno-plt: warn for unsupported targets #124081

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
Jan 23, 2025
Merged

[Driver] -fno-plt: warn for unsupported targets #124081

Show file tree
Hide file tree
Changes from 2 commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
a38b6ae
[𝘀𝗽𝗿] initial version
MaskRay Jan 23, 2025
45665f2
.
MaskRay Jan 23, 2025
e0b459c
update test
MaskRay Jan 23, 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
5 changes: 2 additions & 3 deletions clang/lib/Driver/ToolChains/Clang.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -6141,9 +6141,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
CmdArgs.push_back("-fno-direct-access-external-data");
}

if (Args.hasFlag(options::OPT_fno_plt, options::OPT_fplt, false)) {
CmdArgs.push_back("-fno-plt");
}
if (Triple.isOSBinFormatELF() && (Triple.isAArch64() || Triple.isX86()))
Args.addOptOutFlag(CmdArgs, options::OPT_fplt, options::OPT_fno_plt);

// -fhosted is default.
// TODO: Audit uses of KernelOrKext and see where it'd be more appropriate to
Expand Down
9 changes: 9 additions & 0 deletions clang/test/Driver/fno-plt.c
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
// RUN: %clang -### -c --target=aarch64 -fno-plt -Werror %s 2>&1 | FileCheck %s
// RUN: %clang -### -c --target=x86_64 -fno-plt -Werror %s 2>&1 | FileCheck %s
// RUN: %clang -### -c --target=aarch64 -fno-plt -fplt -Werror %s 2>&1 | FileCheck %s --check-prefix=NO
Copy link
Member

Choose a reason for hiding this comment

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

There's quite many negations involved in this check line, can you rename the NO prefix to e.g. PLT or something like that, to signify the case when -fplt is in effect? Then again, using --check-prefix=PLT for the aarch64-windows target feels a bit misleading as well. Perhaps if we'd rename CHECK into NOPLT and NO into DEFAULT?

// RUN: %clang -### -c --target=powerpc64 -fno-plt %s 2>&1 | FileCheck %s --check-prefixes=WARN,NO
// RUN: %clang -### -c --target=aarch64-windows -fno-plt %s 2>&1 | FileCheck %s --check-prefixes=WARN,NO

// WARN: warning: argument unused during compilation: '-fno-plt' [-Wunused-command-line-argument]
// CHECK: "-fno-plt"
// NO-NOT: "-fno-plt"
Loading