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[clang-cl] Add support for CL and _CL_ environment variables

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cl uses 'CL' and '_CL_' to prepend and append command line options to
the given argument vector.  There is an additional quirk whereby '#' is
transformed into '='.

Differential Revision: http://reviews.llvm.org/D11896

llvm-svn: 244473
This commit is contained in:
David Majnemer 2015-08-10 18:16:32 +00:00
parent 1a1e1ca949
commit 3a4f95867f
2 changed files with 38 additions and 0 deletions
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6
clang/test/Driver/cl-options.c
View File

@ -379,6 +379,12 @@
// RUN: %clang_cl -fmsc-version=1900 -TP -### -- %s 2>&1 | FileCheck -check-prefix=CXX14 %s
// CXX14: -std=c++14
// RUN: env CL="/Gy" %clang_cl -### -- %s 2>&1 | FileCheck -check-prefix=ENV-CL %s
// ENV-CL: "-ffunction-sections"
// RUN: env CL="/Gy" _CL_="/Gy- -- %s" %clang_cl -### 2>&1 | FileCheck -check-prefix=ENV-_CL_ %s
// ENV-_CL_-NOT: "-ffunction-sections"
// Accept "core" clang options.
// (/Zs is for syntax-only, -Werror makes it fail hard on unknown options)
// RUN: %clang_cl \

32
clang/tools/driver/driver.cpp
View File

@ -300,6 +300,15 @@ static void insertArgsFromProgramName(StringRef ProgName,
}
}
static void getCLEnvVarOptions(std::string &EnvValue, llvm::StringSaver &Saver,
SmallVectorImpl<const char *> &Opts) {
llvm::cl::TokenizeWindowsCommandLine(EnvValue, Saver, Opts);
// The first instance of '#' should be replaced with '=' in each option.
for (const char *Opt : Opts)
if (char *NumberSignPtr = const_cast<char *>(::strchr(Opt, '#')))
*NumberSignPtr = '=';
}
static void SetBackdoorDriverOutputsFromEnvVars(Driver &TheDriver) {
// Handle CC_PRINT_OPTIONS and CC_PRINT_OPTIONS_FILE.
TheDriver.CCPrintOptions = !!::getenv("CC_PRINT_OPTIONS");
@ -445,6 +454,29 @@ int main(int argc_, const char **argv_) {
}
}
// Handle CL and _CL_ which permits additional command line options to be
// prepended or appended.
if (Tokenizer == &llvm::cl::TokenizeWindowsCommandLine) {
// Arguments in "CL" are prepended.
llvm::Optional<std::string> OptCL = llvm::sys::Process::GetEnv("CL");
if (OptCL.hasValue()) {
SmallVector<const char *, 8> PrependedOpts;
getCLEnvVarOptions(OptCL.getValue(), Saver, PrependedOpts);
// Insert right after the program name to prepend to the argument list.
argv.insert(argv.begin() + 1, PrependedOpts.begin(), PrependedOpts.end());
}
// Arguments in "_CL_" are appended.
llvm::Optional<std::string> Opt_CL_ = llvm::sys::Process::GetEnv("_CL_");
if (Opt_CL_.hasValue()) {
SmallVector<const char *, 8> AppendedOpts;
getCLEnvVarOptions(Opt_CL_.getValue(), Saver, AppendedOpts);
// Insert at the end of the argument list to append.
argv.append(AppendedOpts.begin(), AppendedOpts.end());
}
}
std::set<std::string> SavedStrings;
// Handle CCC_OVERRIDE_OPTIONS, used for editing a command line behind the
// scenes.