------- Additional Comments From todd dot veldhuizen at logicblox dot com
2010-07-28 22:05 -------
Here is a C++ program that will create a bunch of .c files, compile and then
link them, hitting the bug. It links very quickly without the -O1 option, and
with the -O1 option it takes a very long time.
---==== cut-here
#include <stdlib.h>
#include <stdio.h>
#include <string>
#include <map>
int main()
{
const int num_symbols = 199933;
const int ref_symbol_delta = 37199;
const int num_files = 25;
char tbuf[128];
srand(1);
std::string objfiles;
int ref_symbol = 0;
int i = 0;
for (int j=0; j < num_files; ++j)
{
int symbols_ceil = (num_symbols*(j+1))/num_files;
sprintf(tbuf, "many_symbols%03d.c", j+1);
FILE* dst = fopen(tbuf, "w");
std::map<int,int> sites;
for (; i < symbols_ceil; ++i)
{
ref_symbol = (ref_symbol + ref_symbol_delta) % num_symbols;
sites[i] = ref_symbol;
fprintf(dst, "void foo%d();\n", ref_symbol);
}
for (std::map<int,int>::iterator iter = sites.begin();
iter != sites.end(); ++iter)
{
fprintf(dst, "void foo%d() { foo%d(); }\n", iter->first,
iter->second);
}
fclose(dst);
sprintf(tbuf, "gcc -c -fPIC many_symbols%03d.c -o many_symbols%03d.o",
j+1, j+1);
printf("%s\n", tbuf);
system(tbuf);
sprintf(tbuf, "many_symbols%03d.o", j+1);
objfiles += ((j > 0) ? " " : "") + std::string(tbuf);
}
system("time ld -O1 many_symbols???.o -shared -o libxxx.so");
}
---==== cut-here
--
http://sourceware.org/bugzilla/show_bug.cgi?id=11843
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