[Bug middle-end/53776] New: pragma optimize does not support Os

[vincenzo.innocente at cern dot ch]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53776

             Bug #: 53776
           Summary: pragma optimize does not support Os
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: vincenzo.innoce...@cern.ch


I need to compile optimized for size some portion of code.
The easiest is to "inject" pragmas in the source code at building time

unfortunately Os (and I think also Ofast) are not supported in 
pragma optimize (and I think also not by __attribute__)
only numbers works

for instance take

cat optopt.cc
#pragma GCC optimize ("s")

void bar(int);

inline void foo(int i, int j) {
  if (i>0) bar(i);
  if (j>0) bar(j);
  if (i>0) bar(j);
  if (j>0) bar(i);
 };


void foo1(int i, int j) {
  foo(i,j);
}
void foo2(int i, int j) {
  foo(i,j);
}
void foo3(int i, int j) {
  foo(i,j);
}

c++ -O2 -c optopt.cc; nm -C optopt.o
                 U bar(int)
0000000000000000 T foo1(int, int)
0000000000000060 T foo2(int, int)
00000000000000c0 T foo3(int, int)
 c++ -Os -c optopt.cc; nm -C optopt.o
                 U bar(int)
0000000000000000 W foo(int, int)
0000000000000000 T foo1(int, int)
0000000000000005 T foo2(int, int)
000000000000000a T foo3(int, int)

with
#pragma GCC optimize ("1")
one gets what intended
c++ -O2 -c optopt.cc; nm -C optopt.o
                 U bar(int)
0000000000000000 W foo(int, int)
0000000000000000 T foo1(int, int)
0000000000000010 T foo2(int, int)
0000000000000020 T foo3(int, int)