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Implement PR315: abort, don't warn, when missing external functions encountered

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This fixes some critical problems building libstdc++ on cygwin.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13934 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-06-01 21:49:00 +00:00
parent 7124771c5d
commit abf1cd3ada
1 changed files with 17 additions and 9 deletions
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24
lib/ExecutionEngine/JIT/Intercept.cpp
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@ -60,8 +60,13 @@ void *FunctionPointers[] = {
};
#endif // __linux__
// NoopFn - Used if we have nothing else to call...
static void NoopFn() {}
// __mainFunc - If the program does not have a linked in __main function, allow
// it to run, but print a warning.
static void __mainFunc() {
fprintf(stderr, "WARNING: Program called __main but was not linked to "
"libcrtend.a.\nThis probably won't hurt anything unless the "
"program is written in C++.\n");
}
// jit_exit - Used to intercept the "exit" library call.
static void jit_exit(int Status) {
@ -86,13 +91,16 @@ void *JIT::getPointerToNamedFunction(const std::string &Name) {
if (Name == "exit") return (void*)&jit_exit;
if (Name == "atexit") return (void*)&jit_atexit;
// If the program does not have a linked in __main function, allow it to run,
// but print a warning.
if (Name == "__main") return (void*)&__mainFunc;
// If it's an external function, look it up in the process image...
void *Ptr = GetAddressOfSymbol(Name);
if (Ptr == 0) {
std::cerr << "WARNING: Cannot resolve fn '" << Name
<< "' using a dummy noop function instead!\n";
Ptr = (void*)NoopFn;
}
if (Ptr) return Ptr;
return Ptr;
std::cerr << "ERROR: Program used external function '" << Name
<< "' which could not be resolved!\n";
abort();
return 0;
}