Thanks for your answer. I additionaly checked the binaries produced on
i386 (the binary produced with -integrated-as is identical to the one
produced with no additional options but different from the one
produces with -no-integrated-as). I also found that on aarch64, GNU as
is not installed at all (I falsely assumed it would be there because
the corresponding man page is there). This confirms what you are
saying.
Regards
Stanislav
On Mi, 1 Mär 2023 14:20:34 -0000 (UTC)
Stuart Henderson <[email protected]> wrote:
On 2023-03-01, Stanislav Syekirin
<[email protected]> wrote:
Hi,
clang can use its integrated assembler or some other assembler (GNU
as, I presume). How do I find out which one is used by default? The
man page only says: "Whether the integrated assembler is on by
default
is target dependent". My platforms are aarch64 and i386, if it
helps.
AFAIK the OpenBSD architectures which use clang to compile the main
OS are all also using the integrated assembler. (Not sure if sparc64
does but in that case, while LLVM/clang are built, they aren't yet
used to build the OS).
I'm not sure if it's documented anywhere, I didn't find it.
But llvm/lib/MC/MCAsmInfo.cpp has this comment
// - Solaris always enables the integrated assembler by default
// - SparcELFMCAsmInfo and X86ELFMCAsmInfo are handling this case
// - Windows always enables the integrated assembler by default
// - MCAsmInfoCOFF is handling this case, should it be
MCAsmInfoMicrosoft?
// - MachO targets always enables the integrated assembler by
default
// - MCAsmInfoDarwin is handling this case
// - Generic_GCC toolchains enable the integrated assembler on a
per
// architecture basis.
// - The target subclasses for AArch64, ARM, and X86 handle these
cases
and clang/lib/Driver/ToolChains/Gnu.cpp has
bool Generic_GCC::IsIntegratedAssemblerDefault() const {
switch (getTriple().getArch()) {
case llvm::Triple::x86:
case llvm::Triple::x86_64:
case llvm::Triple::aarch64:
case llvm::Triple::aarch64_be:
case llvm::Triple::arm:
case llvm::Triple::armeb:
case llvm::Triple::avr:
case llvm::Triple::bpfel:
case llvm::Triple::bpfeb:
case llvm::Triple::thumb:
case llvm::Triple::thumbeb:
case llvm::Triple::ppc:
case llvm::Triple::ppcle:
case llvm::Triple::ppc64:
case llvm::Triple::ppc64le:
case llvm::Triple::riscv32:
case llvm::Triple::riscv64:
case llvm::Triple::systemz:
case llvm::Triple::mips:
case llvm::Triple::mipsel:
case llvm::Triple::mips64:
case llvm::Triple::mips64el:
case llvm::Triple::msp430:
case llvm::Triple::m68k:
return true;
case llvm::Triple::sparc:
case llvm::Triple::sparcel:
case llvm::Triple::sparcv9:
if (getTriple().isOSFreeBSD() ||
getTriple().isOSSolaris())
return true;
return false;
default:
return false;
}
}
--
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