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Modified the linker so that it always links in an object from an archive 

that defines the symbol "main."  This is a hack that ensures that programs
that place their main function in a library and then link it in
(i.e. Apache 2.x) get their main function linked in.

There is probably a more correct way to do this, but this works for now.

llvm-svn: 10594
This commit is contained in:
John Criswell 2003-12-23 17:37:06 +00:00
parent bd03ac8567
commit b6d3cb9449
1 changed files with 21 additions and 11 deletions
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32
llvm/tools/gccld/Linker.cpp
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@ -200,17 +200,27 @@ static bool LinkInArchive(Module *M,
const std::set<std::string> &DefSymbols = DefinedSymbols[i];
bool ObjectRequired = false;
for (std::set<std::string>::iterator I = UndefinedSymbols.begin(),
E = UndefinedSymbols.end(); I != E; ++I)
if (DefSymbols.count(*I)) {
if (Verbose)
std::cerr << " Found object '"
<< Objects[i]->getModuleIdentifier ()
<< "' providing symbol '" << *I << "'...\n";
ObjectRequired = true;
break;
}
//
// If the object defines main(), then it is automatically required.
// Otherwise, look to see if it defines a symbol that is currently
// undefined.
//
if ((DefSymbols.find ("main")) == DefSymbols.end()) {
for (std::set<std::string>::iterator I = UndefinedSymbols.begin(),
E = UndefinedSymbols.end(); I != E; ++I)
if (DefSymbols.count(*I)) {
if (Verbose)
std::cerr << " Found object '"
<< Objects[i]->getModuleIdentifier ()
<< "' providing symbol '" << *I << "'...\n";
ObjectRequired = true;
break;
}
} else {
ObjectRequired = true;
}
// We DO need to link this object into the program...
if (ObjectRequired) {
if (LinkModules(M, Objects[i], &ErrorMessage))