zahen created this revision.
zahen added reviewers: rnk, hans, thakis.
Herald added subscribers: cfe-commits, dang.
Herald added a project: clang.
zahen requested review of this revision.
Add an option to directly specify where the msvc toolchain lives for clang-cl
and avoid unwanted file and registry probes.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D85998
Files:
clang/include/clang/Driver/Options.td
clang/lib/Driver/ToolChains/MSVC.cpp
clang/test/Driver/cl-options.c
Index: clang/test/Driver/cl-options.c
===================================================================
--- clang/test/Driver/cl-options.c
+++ clang/test/Driver/cl-options.c
@@ -682,4 +682,7 @@
// CLANG-NOT: "--dependent-lib=libcmt"
// CLANG-NOT: "-vectorize-slp"
+// vctoolsdir is handled by the driver; just check that we don't error. Pass
-c because fakedir isn't a real toolchain path
+// RUN: %clang_cl -c -vctoolsdir fakedir -- %s 2>&1
+
void f() { }
Index: clang/lib/Driver/ToolChains/MSVC.cpp
===================================================================
--- clang/lib/Driver/ToolChains/MSVC.cpp
+++ clang/lib/Driver/ToolChains/MSVC.cpp
@@ -66,6 +66,18 @@
static bool getSystemRegistryString(const char *keyPath, const char *valueName,
std::string &value, std::string *phValue);
+// Check command line arguments to try and find a toolchain.
+static bool findVCToolChainViaCommandLine(const ArgList &Args, std::string
&Path,
+ MSVCToolChain::ToolsetLayout
&VSLayout) {
+ // Trust the value supplied by the user.
+ if (Arg *A = Args.getLastArg(options::OPT__SLASH_vctoolsdir)) {
+ Path = A->getValue();
+ VSLayout = MSVCToolChain::ToolsetLayout::VS2017OrNewer;
+ return true;
+ }
+ return false;
+}
+
// Check various environment variables to try and find a toolchain.
static bool findVCToolChainViaEnvironment(std::string &Path,
MSVCToolChain::ToolsetLayout
&VSLayout) {
@@ -751,7 +763,8 @@
// what they want to use.
// Failing that, just try to find the newest Visual Studio version we can
// and use its default VC toolchain.
- findVCToolChainViaEnvironment(VCToolChainPath, VSLayout) ||
+ findVCToolChainViaCommandLine(Args, VCToolChainPath, VSLayout) ||
+ findVCToolChainViaEnvironment(VCToolChainPath, VSLayout) ||
findVCToolChainViaSetupConfig(VCToolChainPath, VSLayout) ||
findVCToolChainViaRegistry(VCToolChainPath, VSLayout);
}
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -4737,6 +4737,8 @@
def _SLASH_Tp : CLCompileJoinedOrSeparate<"Tp">,
HelpText<"Treat <file> as C++ source file">, MetaVarName<"<file>">;
def _SLASH_TP : CLCompileFlag<"TP">, HelpText<"Treat all source files as C++">;
+def _SLASH_vctoolsdir : CLJoinedOrSeparate<"vctoolsdir">,
+ HelpText<"Path to the VCToolChain">, MetaVarName<"<dir>">;
def _SLASH_volatile_iso : Option<["/", "-"], "volatile:iso", KIND_FLAG>,
Group<_SLASH_volatile_Group>, Flags<[CLOption, DriverOption]>,
HelpText<"Volatile loads and stores have standard semantics">;
Index: clang/test/Driver/cl-options.c
===================================================================
--- clang/test/Driver/cl-options.c
+++ clang/test/Driver/cl-options.c
@@ -682,4 +682,7 @@
// CLANG-NOT: "--dependent-lib=libcmt"
// CLANG-NOT: "-vectorize-slp"
+// vctoolsdir is handled by the driver; just check that we don't error. Pass -c because fakedir isn't a real toolchain path
+// RUN: %clang_cl -c -vctoolsdir fakedir -- %s 2>&1
+
void f() { }
Index: clang/lib/Driver/ToolChains/MSVC.cpp
===================================================================
--- clang/lib/Driver/ToolChains/MSVC.cpp
+++ clang/lib/Driver/ToolChains/MSVC.cpp
@@ -66,6 +66,18 @@
static bool getSystemRegistryString(const char *keyPath, const char *valueName,
std::string &value, std::string *phValue);
+// Check command line arguments to try and find a toolchain.
+static bool findVCToolChainViaCommandLine(const ArgList &Args, std::string &Path,
+ MSVCToolChain::ToolsetLayout &VSLayout) {
+ // Trust the value supplied by the user.
+ if (Arg *A = Args.getLastArg(options::OPT__SLASH_vctoolsdir)) {
+ Path = A->getValue();
+ VSLayout = MSVCToolChain::ToolsetLayout::VS2017OrNewer;
+ return true;
+ }
+ return false;
+}
+
// Check various environment variables to try and find a toolchain.
static bool findVCToolChainViaEnvironment(std::string &Path,
MSVCToolChain::ToolsetLayout &VSLayout) {
@@ -751,7 +763,8 @@
// what they want to use.
// Failing that, just try to find the newest Visual Studio version we can
// and use its default VC toolchain.
- findVCToolChainViaEnvironment(VCToolChainPath, VSLayout) ||
+ findVCToolChainViaCommandLine(Args, VCToolChainPath, VSLayout) ||
+ findVCToolChainViaEnvironment(VCToolChainPath, VSLayout) ||
findVCToolChainViaSetupConfig(VCToolChainPath, VSLayout) ||
findVCToolChainViaRegistry(VCToolChainPath, VSLayout);
}
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -4737,6 +4737,8 @@
def _SLASH_Tp : CLCompileJoinedOrSeparate<"Tp">,
HelpText<"Treat <file> as C++ source file">, MetaVarName<"<file>">;
def _SLASH_TP : CLCompileFlag<"TP">, HelpText<"Treat all source files as C++">;
+def _SLASH_vctoolsdir : CLJoinedOrSeparate<"vctoolsdir">,
+ HelpText<"Path to the VCToolChain">, MetaVarName<"<dir>">;
def _SLASH_volatile_iso : Option<["/", "-"], "volatile:iso", KIND_FLAG>,
Group<_SLASH_volatile_Group>, Flags<[CLOption, DriverOption]>,
HelpText<"Volatile loads and stores have standard semantics">;
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