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| author | Sam Elliott <selliott@lowrisc.org> | 2019-06-21 10:03:31 +0000 |
|---|---|---|
| committer | Sam Elliott <selliott@lowrisc.org> | 2019-06-21 10:03:31 +0000 |
| commit | 3e53e0e4d48d405890f40777b4be5bd49cfac121 (patch) | |
| tree | 3d71f3dcfaaf1007d64f7332dfd793b071a4e68a /clang/test/Driver/riscv-features.c | |
| parent | 4f7d3e90974a0c778434c3eb893fe251f5a6b4a4 (diff) | |
| download | bcm5719-llvm-3e53e0e4d48d405890f40777b4be5bd49cfac121.tar.gz bcm5719-llvm-3e53e0e4d48d405890f40777b4be5bd49cfac121.zip | |
[RISC-V] Add -msave-restore and -mno-save-restore to clang driver
Summary:
The GCC RISC-V toolchain accepts `-msave-restore` and `-mno-save-restore`
to control whether libcalls are used for saving and restoring the stack within
prologues and epilogues.
Clang currently errors if someone passes -msave-restore or -mno-save-restore.
This means that people need to change build configurations to use clang. This
patch adds these flags, so that clang invocations can now match gcc.
As the RISC-V backend does not currently have a `save-restore` target feature,
we emit a warning if someone requests `-msave-restore`. LLVM does not error if
we pass the (unimplemented) target features `+save-restore` or `-save-restore`.
Reviewers: asb, luismarques
Reviewed By: asb
Subscribers: rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, kito-cheng, shiva0217, jrtc27, zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o, rkruppe, PkmX, jocewei, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D63498
llvm-svn: 364018
Diffstat (limited to 'clang/test/Driver/riscv-features.c')
| -rw-r--r-- | clang/test/Driver/riscv-features.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/clang/test/Driver/riscv-features.c b/clang/test/Driver/riscv-features.c index bdf9ef4084c..edd57c3a790 100644 --- a/clang/test/Driver/riscv-features.c +++ b/clang/test/Driver/riscv-features.c @@ -3,11 +3,23 @@ // CHECK: fno-signed-char +// RUN: %clang -target riscv32-unknown-elf -### %s 2>&1 | FileCheck %s -check-prefix=DEFAULT + // RUN: %clang -target riscv32-unknown-elf -### %s -mrelax 2>&1 | FileCheck %s -check-prefix=RELAX // RUN: %clang -target riscv32-unknown-elf -### %s -mno-relax 2>&1 | FileCheck %s -check-prefix=NO-RELAX -// RUN: %clang -target riscv32-unknown-elf -### %s 2>&1 | FileCheck %s -check-prefix=DEFAULT // RELAX: "-target-feature" "+relax" // NO-RELAX: "-target-feature" "-relax" // DEFAULT: "-target-feature" "+relax" // DEFAULT-NOT: "-target-feature" "-relax" + +// RUN: %clang -target riscv32-unknown-elf -### %s -msave-restore 2>&1 | FileCheck %s -check-prefix=SAVE-RESTORE +// RUN: %clang -target riscv32-unknown-elf -### %s -mno-save-restore 2>&1 | FileCheck %s -check-prefix=NO-SAVE-RESTORE + +// SAVE-RESTORE: warning: the clang compiler does not support '-msave-restore' +// DEFAULT-NOT: warning: the clang compiler does not support + +// SAVE-RESTORE: "-target-feature" "+save-restore" +// NO-SAVE-RESTORE: "-target-feature" "-save-restore" +// DEFAULT: "-target-feature" "-save-restore" +// DEFAULT-NOT: "-target-feature" "+save-restore"
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