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Use the FindProgramByName fallback only with known absolute paths.

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I wasn't able to convince myself that all GetMainExecutable
implementations always return absolute paths; this prevents
unexpected behavior in case they ever don't.

llvm-svn: 112888
This commit is contained in:
Dan Gohman 2010-09-02 22:32:38 +00:00
parent 2fe6cd2026
commit 603d00d632
1 changed files with 10 additions and 4 deletions
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14
lib/Support/SystemUtils.cpp
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@ -49,10 +49,16 @@ sys::Path llvm::FindExecutable(const std::string &ExeName,
Result.appendComponent(ExeName);
if (Result.canExecute())
return Result;
// Expect to retrieve the pathname with suffix .exe.
Result = sys::Program::FindProgramByName(Result.str());
if (!Result.empty())
return Result;
// If the path is absolute (and it usually is), call FindProgramByName to
// allow it to try platform-specific logic, such as appending a .exe suffix
// on Windows. Don't do this if we somehow have a relative path, because
// we don't want to go searching the PATH and accidentally find an unrelated
// version of the program.
if (Result.isAbsolute()) {
Result = sys::Program::FindProgramByName(Result.str());
if (!Result.empty())
return Result;
}
}
return sys::Path();