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Fix bug in llvm::sys::argumentsFitWithinSystemLimits().

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This patch fixes a subtle bug in the UNIX implementation of
llvm::sys::argumentsFitWithinSystemLimits() regarding the misuse of a static
variable. This bug causes our cached number that stores the system command line
maximum length to be halved after each call to the function. With a sufficient
number of calls to this function, it will eventually report any given command
line string to be over system limits.

Patch by Rafael Auler.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216415 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2014-08-25 22:53:21 +00:00
parent 476f2435f5
commit c33fe1b296
1 changed files with 2 additions and 2 deletions
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4
lib/Support/Unix/Program.inc
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@ -448,13 +448,13 @@ bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {
return true;
// Conservatively account for space required by environment variables.
ArgMax /= 2;
long HalfArgMax = ArgMax / 2;
size_t ArgLength = 0;
for (ArrayRef<const char*>::iterator I = Args.begin(), E = Args.end();
I != E; ++I) {
ArgLength += strlen(*I) + 1;
if (ArgLength > size_t(ArgMax)) {
if (ArgLength > size_t(HalfArgMax)) {
return false;
}
}