https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69769
Bug ID: 69769
Summary: arithmetic operation on pointer to a function
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: wolfgang.roe...@gi-de.com
Target Milestone: ---
Hi,
I would like to post a bug report for the GNU C/C++ compiler 6.0.0.
We use the compiler to generate code for a PowerPC processor.
Invokation line for the GNU C++ compiler:
ccppc -c -x c++ -std=gnu++14 -Wall -Werror -g -mcpu=e6500 -m32
-maltivec=be -mvrsave -ftls-model=local-exec -msdata=sysv
-fno-common -fno-openmp -mbig -mmultiple -mno-string -misel
-mstrict-align -fverbose-asm -fno-exceptions -fno-rtti
-ftemplate-backtrace-limit=20 -G 8 -O3
-I<some include paths>
-D<some #define's>
X.CPP -oX.O
// file X.CPP
#include "atomic"
typedef void (T_FUNC) (int);
T_FUNC* getFunc (std::atomic<T_FUNC*>& refPtr)
{
return refPtr.fetch_add(0, std::memory_order_relaxed);
}
The compiler accepts this programm despite of performing an arithmetic
operation on pointer to a function.
I think this is not standard conforming. The C++11 standard, 29.6.5/28
describes the semantic of the atomic fetch functions:
"Atomically replaces the value pointed to [...] by this with the result of
the computation applied to the value pointed to [...] by this and the given
operand." But applying an arithmetic operation on pointer to a function is
not a legal computation.
With kind regards
W. Roehrl
