diff options
Diffstat (limited to 'llvm/lib/Support/Unix')
| -rw-r--r-- | llvm/lib/Support/Unix/Program.inc | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/llvm/lib/Support/Unix/Program.inc b/llvm/lib/Support/Unix/Program.inc index 5344adf9c3f..04840bf4448 100644 --- a/llvm/lib/Support/Unix/Program.inc +++ b/llvm/lib/Support/Unix/Program.inc @@ -436,13 +436,24 @@ llvm::sys::writeFileWithEncoding(StringRef FileName, StringRef Contents, bool llvm::sys::commandLineFitsWithinSystemLimits(StringRef Program, ArrayRef<const char *> Args) { static long ArgMax = sysconf(_SC_ARG_MAX); + // POSIX requires that _POSIX_ARG_MAX is 4096, which is the lowest possible + // value for ARG_MAX on a POSIX compliant system. + static long ArgMin = _POSIX_ARG_MAX; + + // This the same baseline used by xargs. + long EffectiveArgMax = 128 * 1024; + + if (EffectiveArgMax > ArgMax) + EffectiveArgMax = ArgMax; + else if (EffectiveArgMax < ArgMin) + EffectiveArgMax = ArgMin; // System says no practical limit. if (ArgMax == -1) return true; // Conservatively account for space required by environment variables. - long HalfArgMax = ArgMax / 2; + long HalfArgMax = EffectiveArgMax / 2; size_t ArgLength = Program.size() + 1; for (const char* Arg : Args) { |
