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Added the -native option.

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With this option, gccld links the program into LLVM bytecode and a native code
binary.  This allows llvmgcc to correctly tell GNU configure scripts when
things aren't defined properly (because the native link will fail).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8570 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
John Criswell 2003-09-16 21:27:35 +00:00
parent d16afe9d3e
commit dabaf7de39
1 changed files with 125 additions and 7 deletions
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132
tools/gccld/gccld.cpp
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@ -30,6 +30,9 @@
#include <set>
#include <algorithm>
// This is the environment given to the program.
extern char ** environ;
namespace {
cl::list<std::string>
InputFilenames(cl::Positional, cl::desc("<input bytecode files>"),
@ -64,6 +67,9 @@ namespace {
LinkAsLibrary("link-as-library", cl::desc("Link the .bc files together as a"
" library, not an executable"));
cl::opt<bool>
Native("native", cl::desc("Generate a native binary instead of a shell script"));
// Compatibility options that are ignored, but support by LD
cl::opt<std::string>
CO3("soname", cl::Hidden, cl::desc("Compatibility option: ignored"));
@ -313,6 +319,69 @@ static int PrintAndReturn(const char *progname, const std::string &Message,
return 1;
}
//
// Function: remove_env()
//
// Description:
// Remove the specified environment variable from the environment array.
//
// Inputs:
// name - The name of the variable to remove. It cannot be NULL.
// envp - The array of environment variables. It cannot be NULL.
//
// Outputs:
// envp - The pointer to the specified variable name is removed.
//
// Return value:
// None.
//
// Notes:
// This is mainly done because functions to remove items from the environment
// are not available across all platforms. In particular, Solaris does not
// seem to have an unsetenv() function or a setenv() function (or they are
// undocumented if they do exist).
//
static void
remove_env (const char * name, char ** envp)
{
// Pointer for scanning arrays
register char * p;
// Index for selecting elements of the environment array
register int index;
for (index=0; envp[index] != NULL; index++)
{
//
// Find the first equals sign in the array and make it an EOS character.
//
p = strchr (envp[index], '=');
if (p == NULL)
{
continue;
}
else
{
*p = '\0';
}
//
// Compare the two strings. If they are equal, zap this string.
// Otherwise, restore it.
//
if (!strcmp (name, envp[index]))
{
envp[index] = NULL;
}
else
{
*p = '=';
}
}
return;
}
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm linker for GCC\n");
@ -432,13 +501,62 @@ int main(int argc, char **argv) {
Out.close();
if (!LinkAsLibrary) {
// Output the script to start the program...
std::ofstream Out2(OutputFilename.c_str());
if (!Out2.good())
return PrintAndReturn(argv[0], "error opening '" + OutputFilename +
"' for writing!");
Out2 << "#!/bin/sh\nlli -q $0.bc $*\n";
Out2.close();
//
// If the user wants to generate a native executable, compile it from the
// bytecode file.
//
// Otherwise, create a script that will run the bytecode through the JIT.
//
if (Native)
{
// Name of the output assembly file
std::string AssemblyFile = OutputFilename + ".s";
// Name of the command to execute
std::string cmd;
//
// Create an executable file from the bytecode file.
//
remove_env ("LIBRARY_PATH", environ);
remove_env ("COLLECT_GCC_OPTIONS", environ);
remove_env ("GCC_EXEC_PREFIX", environ);
remove_env ("COMPILER_PATH", environ);
remove_env ("COLLECT_GCC", environ);
//
// Run LLC to convert the bytecode file into assembly code.
//
cmd = "llc -f -o " + AssemblyFile + " " + RealBytecodeOutput;
if ((system (cmd.c_str())) == -1)
{
return PrintAndReturn (argv[0], "Failed to compile bytecode");
}
//
// Run GCC to assemble and link the program into native code.
//
// Note:
// We can't just assemble and link the file with the system assembler
// and linker because we don't know where to put the _start symbol.
// GCC mysteriously knows how to do it.
//
cmd = "gcc -o " + OutputFilename + " " + AssemblyFile;
if ((system (cmd.c_str())) == -1)
{
return PrintAndReturn (argv[0], "Failed to link native code file");
}
}
else
{
// Output the script to start the program...
std::ofstream Out2(OutputFilename.c_str());
if (!Out2.good())
return PrintAndReturn(argv[0], "error opening '" + OutputFilename +
"' for writing!");
Out2 << "#!/bin/sh\nlli -q $0.bc $*\n";
Out2.close();
}
// Make the script executable...
MakeFileExecutable (OutputFilename);