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[Driver] Make -print-libgcc-file-name print compiler-rt lib when used

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Make the -print-libgcc-file-name option print an appropriate compiler
runtime library, that is libgcc.a if gcc runtime is used
and an appropriate compiler-rt library if that runtime is used.

The main use for this is to allow linking executables built with
-nodefaultlibs (e.g. to avoid linking to the standard C++ library) to
the compiler runtime library, e.g. using:

  clang++ ... -nodefaultlibs $(clang++ ... -print-libgcc-file-name)

in which case currently a program built like this linked to the gcc
runtime unconditionally. The patch fixes it to use compiler-rt libraries
instead when compiler-rt is the active runtime.

Differential Revision: https://reviews.llvm.org/D25338

llvm-svn: 283746
This commit is contained in:
Michal Gorny 2016-10-10 12:23:40 +00:00
parent c9edc2ee8d
commit 7cfe480122
7 changed files with 37 additions and 4 deletions
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3
clang/docs/CommandGuide/clang.rst
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@ -394,7 +394,8 @@ Driver Options
.. option:: -print-libgcc-file-name
Print the library path for "libgcc.a".
Print the library path for the currently used compiler runtime library
("libgcc.a" or "libclang_rt.builtins.*.a").
.. option:: -print-prog-name=<name>

3
clang/include/clang/Driver/Options.td
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@ -1861,7 +1861,8 @@ def print_file_name_EQ : Joined<["-", "--"], "print-file-name=">,
def print_ivar_layout : Flag<["-"], "print-ivar-layout">, Flags<[CC1Option]>,
HelpText<"Enable Objective-C Ivar layout bitmap print trace">;
def print_libgcc_file_name : Flag<["-", "--"], "print-libgcc-file-name">,
HelpText<"Print the library path for \"libgcc.a\"">;
HelpText<"Print the library path for the currently used compiler runtime "
"library (\"libgcc.a\" or \"libclang_rt.builtins.*.a\")">;
def print_multi_directory : Flag<["-", "--"], "print-multi-directory">;
def print_multi_lib : Flag<["-", "--"], "print-multi-lib">;
def print_multi_os_directory : Flag<["-", "--"], "print-multi-os-directory">,

10
clang/lib/Driver/Driver.cpp
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@ -994,7 +994,15 @@ bool Driver::HandleImmediateArgs(const Compilation &C) {
}
if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) {
llvm::outs() << GetFilePath("libgcc.a", TC) << "\n";
ToolChain::RuntimeLibType RLT = TC.GetRuntimeLibType(C.getArgs());
switch (RLT) {
case ToolChain::RLT_CompilerRT:
llvm::outs() << TC.getCompilerRT(C.getArgs(), "builtins") << "\n";
break;
case ToolChain::RLT_Libgcc:
llvm::outs() << GetFilePath("libgcc.a", TC) << "\n";
break;
}
return false;
}

2
clang/test/Driver/montavista-gcc-toolchain.c
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@ -1,6 +1,6 @@
// Test that the montavista gcc-toolchain is correctly detected
//
// RUN: %clang -print-libgcc-file-name 2>&1 \
// RUN: %clang -rtlib=platform -print-libgcc-file-name 2>&1 \
// RUN: --target=i686-montavista-linux \
// RUN: --gcc-toolchain=%S/Inputs/montavista_i686_tree/usr \
// RUN: | FileCheck %s

11
clang/test/Driver/print-libgcc-file-name-clangrt.c Normal file
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@ -0,0 +1,11 @@
// Test that -print-libgcc-file-name correctly respects -rtlib=compiler-rt.
// RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name 2>&1 \
// RUN: --target=x86_64-pc-linux \
// RUN: | FileCheck --check-prefix=CHECK-CLANGRT-X8664 %s
// CHECK-CLANGRT-X8664: libclang_rt.builtins-x86_64.a
// RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name 2>&1 \
// RUN: --target=i686-pc-linux \
// RUN: | FileCheck --check-prefix=CHECK-CLANGRT-I686 %s
// CHECK-CLANGRT-I686: libclang_rt.builtins-i686.a

7
clang/test/Driver/print-libgcc-file-name-libgcc.c Normal file
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@ -0,0 +1,7 @@
// Test that -print-libgcc-file-name correctly respects -rtlib=libgcc.
// REQUIRES: libgcc
// RUN: %clang -rtlib=libgcc -print-libgcc-file-name 2>&1 \
// RUN: | FileCheck --check-prefix=CHECK-LIBGCC %s
// CHECK-LIBGCC: libgcc.a

5
clang/test/lit.cfg
View File

@ -375,6 +375,11 @@ if platform.system() not in ['Windows']:
if platform.system() not in ['Windows']:
config.available_features.add('utf8-capable-terminal')
# Support for libgcc runtime. Used to rule out tests that require
# clang to run with -rtlib=libgcc.
if platform.system() not in ['Darwin', 'Fuchsia']:
config.available_features.add('libgcc')
# Native compilation: Check if triples match.
# FIXME: Consider cases that target can be executed
# even if host_triple were different from target_triple.