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7c7bcf3634
Teach the linker that __mcount_internal, __sigjmp_save_symbol, __syscall_error and __GI_exit do not use r2, so that it does not need to recover r2 after the call. Test at configure time if the assembler supports @notoc and define USE_PPC64_NOTOC.
35 lines
1.1 KiB
Plaintext
35 lines
1.1 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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# Local configure fragment for sysdeps/powerpc/powerpc64.
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AC_CACHE_CHECK(for support for overlapping .opd entries,
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libc_cv_overlapping_opd, [dnl
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libc_cv_overlapping_opd=no
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echo 'void foo (void) {}' > conftest.c
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if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
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changequote(,)dnl
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if grep '\.TOC\.@tocbase' conftest.s > /dev/null; then
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if grep '\.TOC\.@tocbase[ ]*,[ ]*0' conftest.s > /dev/null; then
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:
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else
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libc_cv_overlapping_opd=yes
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fi
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fi
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changequote([,])dnl
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fi
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rm -f conftest.c conftest.s
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])
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if test x$libc_cv_overlapping_opd = xyes; then
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AC_DEFINE(USE_PPC64_OVERLAPPING_OPD)
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fi
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# @notoc started to be supported in GNU Binutils 2.31.
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AC_CACHE_CHECK([if the assembler supports @notoc],
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libc_cv_ppc64_notoc, [
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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void foo (void) {asm("b foo@notoc");}
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])],
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[libc_cv_ppc64_notoc=yes],
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[libc_cv_ppc64_notoc=no])])
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AS_IF([test x$libc_cv_ppc64_notoc = xyes],
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[AC_DEFINE(USE_PPC64_NOTOC)])
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