https://llvm.org/bugs/show_bug.cgi?id=27491
Bug ID: 27491
Summary: compiler response file isn't used when command line is
close to response file limit
Product: clang
Version: 3.7
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: dvali...@ea.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
Description:
On windows 7 it appears clang calls itself as a subprocess when used to
compile. For short command lines subprocess is called with all arguments on
command line for large command lines a response file is used. However it
appears if command line used for subprocess is only just over the limit clang
will not use a response file when it should and fail with:
clang++.exe : error : unable to execute command: Couldn't execute program
'C:\some\system\path\LLVM\bin\clang++.exe'The filename or extension is too
long.
Problem appears more frequently the longer the absolute path to clang++.exe
Repro:
- Call clang++.exe to compile any simple cpp file using a response file, use -v
argument to see if clang uses response file when calling clang subprocess
- artificially inflate response file by adding defines (e.g -D BLOAT) until you
see above error message (will happen close 32768 characters)
- if you see clang using response file try trimming response file by a
character at a time, the range is very small (bad range seems to be length of
executable path)
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