http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48333
Summary: -fcompare-debug failure (length) - "memmove" x
"__builtin_memmove"
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: zso...@seznam.cz
CC: aol...@gcc.gnu.org
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 23798
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23798
partially reduced testcase
Compiler output:
$ gcc -O -fkeep-inline-functions -fcompare-debug testcase.ii
testcase.ii: In function ‘std::_Resetiosflags
std::resetiosflags(std::ios_base::fmtflags)’:
testcase.ii:20948:5: warning: extended initializer lists only available with
-std=c++0x or -std=gnu++0x [enabled by default]
testcase.ii: In function ‘std::_Setiosflags
std::setiosflags(std::ios_base::fmtflags)’:
testcase.ii:20966:5: warning: extended initializer lists only available with
-std=c++0x or -std=gnu++0x [enabled by default]
testcase.ii: In function ‘std::_Setbase std::setbase(int)’:
testcase.ii:20984:5: warning: extended initializer lists only available with
-std=c++0x or -std=gnu++0x [enabled by default]
testcase.ii: In function ‘std::_Setfill<_CharT> std::setfill(_CharT)’:
testcase.ii:21010:7: warning: extended initializer lists only available with
-std=c++0x or -std=gnu++0x [enabled by default]
testcase.ii: In function ‘std::_Setprecision std::setprecision(int)’:
testcase.ii:21028:5: warning: extended initializer lists only available with
-std=c++0x or -std=gnu++0x [enabled by default]
testcase.ii: In function ‘std::_Setw std::setw(int)’:
testcase.ii:21046:5: warning: extended initializer lists only available with
-std=c++0x or -std=gnu++0x [enabled by default]
gcc: error: testcase.ii: -fcompare-debug failure (length)
$ diff testcase.*gkd
24071c24071
< (call (mem:QI (symbol_ref:DI ("memmove") [flags 0x41] <function_decl
# memmove>) [ memmove S1 A8])
---
> (call (mem:QI (symbol_ref:DI ("memmove") [flags 0x41] <function_decl
> # memmove>) [ __builtin_memmove S1 A8])
Reducing the testcase is very slow. I met this problem several times, but never
with a small testcase.
