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[RISCV] Add -mrelax/-mno-relax flags to enable/disable RISCV linker relaxation 

Differential Revision: https://reviews.llvm.org/D44888

llvm-svn: 333385
This commit is contained in:
Shiva Chen 2018-05-29 00:44:15 +00:00
parent bd2e949869
commit f78fc3842f
3 changed files with 21 additions and 0 deletions
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7
clang/include/clang/Driver/Options.td
View File

@ -151,6 +151,8 @@ def m_wasm_Features_Group : OptionGroup<"<wasm features group>">,
Group<m_Group>, DocName<"WebAssembly">;
def m_x86_Features_Group : OptionGroup<"<x86 features group>">,
Group<m_Group>, Flags<[CoreOption]>, DocName<"X86">;
def m_riscv_Features_Group : OptionGroup<"<riscv features group>">,
Group<m_Group>, DocName<"RISCV">;
def m_libc_Group : OptionGroup<"<m libc group>">, Group<m_mips_Features_Group>,
Flags<[HelpHidden]>;
@ -1947,6 +1949,11 @@ def mno_rtd: Flag<["-"], "mno-rtd">, Group<m_Group>;
def mno_soft_float : Flag<["-"], "mno-soft-float">, Group<m_Group>;
def mno_stackrealign : Flag<["-"], "mno-stackrealign">, Group<m_Group>;
def mrelax : Flag<["-"], "mrelax">, Group<m_riscv_Features_Group>,
HelpText<"Enable linker relaxation">;
def mno_relax : Flag<["-"], "mno-relax">, Group<m_riscv_Features_Group>,
HelpText<"Disable linker relaxation">;
def munaligned_access : Flag<["-"], "munaligned-access">, Group<m_arm_Features_Group>,
HelpText<"Allow memory accesses to be unaligned (AArch32/AArch64 only)">;
def mno_unaligned_access : Flag<["-"], "mno-unaligned-access">, Group<m_arm_Features_Group>,

5
clang/lib/Driver/ToolChains/Arch/RISCV.cpp
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@ -15,6 +15,7 @@
#include "llvm/Option/ArgList.h"
#include "llvm/Support/TargetParser.h"
#include "llvm/Support/raw_ostream.h"
#include "ToolChains/CommonArgs.h"
using namespace clang::driver;
using namespace clang::driver::tools;
@ -363,6 +364,10 @@ void riscv::getRISCVTargetFeatures(const Driver &D, const ArgList &Args,
// Handle all other types of extensions.
getExtensionFeatures(D, Args, Features, MArch, OtherExts);
}
// Now add any that the user explicitly requested on the command line,
// which may override the defaults.
handleTargetFeaturesGroup(Args, Features, options::OPT_m_riscv_Features_Group);
}
StringRef riscv::getRISCVABI(const ArgList &Args, const llvm::Triple &Triple) {

9
clang/test/Driver/riscv-features.c
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@ -2,3 +2,12 @@
// RUN: %clang -target riscv64-unknown-elf -### %s -fsyntax-only 2>&1 | FileCheck %s
// CHECK: fno-signed-char
// 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-NOT: "-target-feature" "+relax"
// DEFAULT-NOT: "-target-feature" "-relax"