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[clang] [ToolChains/NetBSD] Support relative libc++ header path 

Support locating the libc++ header files relatively to the clang
executable, in addition to the default system path.  This is meant
to cover two use cases: running just-built clang from the install
directory, and running installed clang from non-standard location
(e.g. /usr/local).

This is the first step towards ensuring that tests of more LLVM projects
can work out-of-the-box within the build tree, and use the correct set
of headers (rather than e.g. mixing just-built clang+libcxx with system
install of libcxx).  It avoids requiring the user to hack around missing
include paths, or LLVM build system to replicate system-specific C++
library defaults in order to append appropriate paths implicitly.

Differential Revision: https://reviews.llvm.org/D58592

llvm-svn: 355282
This commit is contained in:
Michal Gorny 2019-03-03 10:06:34 +00:00
parent ce68659772
commit d3516b51ca
1 changed files with 18 additions and 2 deletions
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20
clang/lib/Driver/ToolChains/NetBSD.cpp
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@ -16,6 +16,7 @@
#include "clang/Driver/Options.h"
#include "clang/Driver/SanitizerArgs.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/VirtualFileSystem.h"
using namespace clang::driver;
using namespace clang::driver::tools;
@ -422,8 +423,23 @@ ToolChain::CXXStdlibType NetBSD::GetDefaultCXXStdlibType() const {
void NetBSD::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const {
addSystemInclude(DriverArgs, CC1Args,
getDriver().SysRoot + "/usr/include/c++/");
const std::string Candidates[] = {
// directory relative to build tree
getDriver().Dir + "/../include/c++/v1",
// system install with full upstream path
getDriver().SysRoot + "/usr/include/c++/v1",
// system install from src
getDriver().SysRoot + "/usr/include/c++",
};
for (const auto &IncludePath : Candidates) {
if (!getVFS().exists(IncludePath + "/__config"))
continue;
// Use the first candidate that looks valid.
addSystemInclude(DriverArgs, CC1Args, IncludePath);
return;
}
}
void NetBSD::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,