[LLVMbugs] [Bug 6381] New: Variable length arrays are not permitted in C++
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Mon Feb 22 03:28:59 PST 2010
http://www.llvm.org/bugs/show_bug.cgi?id=6381
Summary: Variable length arrays are not permitted in C++
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P5
Component: C++
AssignedTo: unassignedclangbugs at nondot.org
ReportedBy: rene at exactcode.de
CC: dgregor at apple.com
Estimated Hours: 0.0
Starting to play with Clang++ I notices this (building our Open Source
ExactImage), currently on x86_64, T2 Linux:
lib/Colorspace.cc:442:22: error: variable length arrays are not permitted in
C++
uint8_t gray_lookup[vmax];
the code is straight forward variable length array, like:
..
const int vmax = 1 << bps;
uint8_t gray_lookup[vmax];
The error already indicates it is intentionally disabled in clang++ for C++
Even old (3.x?) versions of G++ happily accept this.
Is there an std=c99 like option to allow this in Clang++? Maybe it should
accept it by default and warn that it is not portable, GNU extension (but I
think present in C++0x)?
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