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[Clang][ARM]Ensure both -mno-unaligned-access and -munaligned-access are passed to multilib selection logic #134099

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Merged
merged 5 commits into from
Apr 3, 2025
Merged

[Clang][ARM]Ensure both -mno-unaligned-access and -munaligned-access are passed to multilib selection logic #134099

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7f63020
Refine multilib selection to handle alignment based on architecture f…
simpal01 Apr 2, 2025
0242cea
fixup! Test that test -mstrict-align/-mno-strict-align too passed to …
simpal01 Apr 2, 2025
6fd1608
fixup! Address review comments by canonicalizing to -mno-unaligned-ac…
simpal01 Apr 3, 2025
7484160
fixup! Remove braces on single statement if else to align with LLVM c…
simpal01 Apr 3, 2025
24597d0
fixup! Remove braces on single statement if else to align with LLVM c…
simpal01 Apr 3, 2025
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24 changes: 12 additions & 12 deletions clang/lib/Driver/ToolChain.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -239,12 +239,12 @@ static void getAArch64MultilibFlags(const Driver &D,
Result.push_back(BranchProtectionArg->getAsString(Args));
}

if (Arg *AlignArg = Args.getLastArg(
options::OPT_mstrict_align, options::OPT_mno_strict_align,
options::OPT_mno_unaligned_access, options::OPT_munaligned_access)) {
if (AlignArg->getOption().matches(options::OPT_mstrict_align) ||
AlignArg->getOption().matches(options::OPT_mno_unaligned_access))
Result.push_back(AlignArg->getAsString(Args));
if (FeatureSet.contains("+strict-align")) {
Result.push_back("-mno-unaligned-access");
Result.push_back("-mstrict-align");
} else {
Result.push_back("-munaligned-access");
Result.push_back("-mno-strict-align");
}

if (Arg *Endian = Args.getLastArg(options::OPT_mbig_endian,
Expand Down Expand Up @@ -313,12 +313,12 @@ static void getARMMultilibFlags(const Driver &D,
Result.push_back(BranchProtectionArg->getAsString(Args));
}

if (Arg *AlignArg = Args.getLastArg(
options::OPT_mstrict_align, options::OPT_mno_strict_align,
options::OPT_mno_unaligned_access, options::OPT_munaligned_access)) {
if (AlignArg->getOption().matches(options::OPT_mstrict_align) ||
AlignArg->getOption().matches(options::OPT_mno_unaligned_access))
Result.push_back(AlignArg->getAsString(Args));
if (FeatureSet.contains("+strict-align")) {
Result.push_back("-mno-unaligned-access");
Result.push_back("-mstrict-align");
} else {
Result.push_back("-munaligned-access");
Result.push_back("-mno-strict-align");
}

if (Arg *Endian = Args.getLastArg(options::OPT_mbig_endian,
Expand Down
6 changes: 6 additions & 0 deletions clang/test/Driver/print-multi-selection-flags.c
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Original file line number Diff line number Diff line change
Expand Up @@ -69,9 +69,15 @@
// CHECK-BRANCH-PROTECTION: -mbranch-protection=standard

// RUN: %clang -multi-lib-config=%S/Inputs/multilib/empty.yaml -print-multi-flags-experimental --target=arm-none-eabi -mno-unaligned-access | FileCheck --check-prefix=CHECK-NO-UNALIGNED-ACCESS %s
// RUN: %clang -multi-lib-config=%S/Inputs/multilib/empty.yaml -print-multi-flags-experimental --target=arm-none-eabi | FileCheck --check-prefix=CHECK-NO-UNALIGNED-ACCESS %s
// RUN: %clang -multi-lib-config=%S/Inputs/multilib/empty.yaml -print-multi-flags-experimental --target=aarch64-none-elf -mno-unaligned-access | FileCheck --check-prefix=CHECK-NO-UNALIGNED-ACCESS %s
// CHECK-NO-UNALIGNED-ACCESS: -mno-unaligned-access

// RUN: %clang -multi-lib-config=%S/Inputs/multilib/empty.yaml -print-multi-flags-experimental --target=arm-none-eabi -munaligned-access | FileCheck --check-prefix=CHECK-UNALIGNED-ACCESS %s
// RUN: %clang -multi-lib-config=%S/Inputs/multilib/empty.yaml -print-multi-flags-experimental --target=aarch64-none-elf | FileCheck --check-prefix=CHECK-UNALIGNED-ACCESS %s
// RUN: %clang -multi-lib-config=%S/Inputs/multilib/empty.yaml -print-multi-flags-experimental --target=aarch64-none-elf -munaligned-access | FileCheck --check-prefix=CHECK-UNALIGNED-ACCESS %s
// CHECK-UNALIGNED-ACCESS: -munaligned-access

// RUN: %clang -multi-lib-config=%S/Inputs/multilib/empty.yaml -print-multi-flags-experimental --target=arm-none-eabi -mbig-endian | FileCheck --check-prefix=CHECK-BIG-ENDIAN %s
// RUN: %clang -multi-lib-config=%S/Inputs/multilib/empty.yaml -print-multi-flags-experimental --target=aarch64-none-elf -mbig-endian | FileCheck --check-prefix=CHECK-BIG-ENDIAN %s
// CHECK-BIG-ENDIAN: -mbig-endian
Expand Down
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