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Much like we silence warnings about -flto in many cases to facilitate 

simplicity in build systems, silence '-stdlib=libc++' when linking. Even
if we're not linking C++ code per-se, we may be passing this flag so
that when we are linking C++ code we pick up the desired standard
library. While most build systems already provide separate C and C++
compile flags, many conflate link flags. Sadly, CMake is among them
causing this warning in a libc++ selfhost.

llvm-svn: 231559
This commit is contained in:
Chandler Carruth 2015-03-07 10:01:29 +00:00
parent df397c520d
commit 7e7dd47fc2
2 changed files with 19 additions and 0 deletions
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2
clang/lib/Driver/Tools.cpp
View File

@ -7704,6 +7704,8 @@ void gnutools::Link::ConstructJob(Compilation &C, const JobAction &JA,
CmdArgs.push_back("-Bdynamic");
CmdArgs.push_back("-lm");
}
// Silence warnings when linking C code with a C++ '-stdlib' argument.
Args.ClaimAllArgs(options::OPT_stdlib_EQ);
if (!Args.hasArg(options::OPT_nostdlib)) {
if (!Args.hasArg(options::OPT_nodefaultlibs)) {

17
clang/test/Driver/linux-ld.c
View File

@ -417,6 +417,23 @@
// CHECK-BASIC-LIBCXX-INSTALL: "--sysroot=[[SYSROOT]]"
// CHECK-BASIC-LIBCXX-INSTALL: "-L[[SYSROOT]]/usr/bin/../lib"
//
// Test that we can use -stdlib=libc++ in a build system even when it
// occasionally links C code instead of C++ code.
// RUN: %clang -no-canonical-prefixes -x c %s -### -o %t.o 2>&1 \
// RUN: -target x86_64-unknown-linux-gnu \
// RUN: -stdlib=libc++ \
// RUN: -ccc-install-dir %S/Inputs/basic_linux_libcxx_tree/usr/bin \
// RUN: --gcc-toolchain="" \
// RUN: --sysroot=%S/Inputs/basic_linux_libcxx_tree \
// RUN: | FileCheck --check-prefix=CHECK-BASIC-LIBCXX-C-LINK %s
// CHECK-BASIC-LIBCXX-C-LINK-NOT: warning:
// CHECK-BASIC-LIBCXX-C-LINK: "{{[^"]*}}clang{{[^"]*}}" "-cc1"
// CHECK-BASIC-LIBCXX-C-LINK: "-isysroot" "[[SYSROOT:[^"]+]]"
// CHECK-BASIC-LIBCXX-C-LINK-NOT: "-internal-isystem" "[[SYSROOT]]/usr/bin/../include/c++/v1"
// CHECK-BASIC-LIBCXX-C-LINK: "-internal-isystem" "[[SYSROOT]]/usr/local/include"
// CHECK-BASIC-LIBCXX-C-LINK: "--sysroot=[[SYSROOT]]"
// CHECK-BASIC-LIBCXX-C-LINK: "-L[[SYSROOT]]/usr/bin/../lib"
//
// Test a very broken version of multiarch that shipped in Ubuntu 11.04.
// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
// RUN: --target=i386-unknown-linux \