Blame sysdeps/x86/configure.ac
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GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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# Local configure fragment for sysdeps/x86.
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if test x"$enable_cet" = xyes; then
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# Check if CET can be enabled.
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AC_CACHE_CHECK(whether CET can be enabled,
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libc_cv_x86_cet_available, [dnl
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cat > conftest.c <
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#if !defined __CET__ || __CET__ != 3
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# error CET isn't available.
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#endif
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EOF
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if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS -fcf-protection -include cet.h conftest.c 1>&AS_MESSAGE_LOG_FD); then
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libc_cv_x86_cet_available=yes
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else
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libc_cv_x86_cet_available=no
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fi
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rm -rf conftest*])
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if test $libc_cv_x86_cet_available = yes; then
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enable_cet=yes
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else
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if test x"$enable_cet" = xdefault; then
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enable_cet=no
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else
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AC_MSG_ERROR([$CC doesn't support CET])
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fi
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fi
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fi
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if test $enable_cet = yes; then
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# Check if assembler supports CET.
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AC_CACHE_CHECK(whether $AS supports CET,
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libc_cv_x86_cet_as, [dnl
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cat > conftest.s <
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incsspd %ecx
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EOF
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if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s -o conftest.o 1>&AS_MESSAGE_LOG_FD); then
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libc_cv_x86_cet_as=yes
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else
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libc_cv_x86_cet_as=no
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fi
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rm -rf conftest*])
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if test $libc_cv_x86_cet_as = no; then
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AC_MSG_ERROR([$AS doesn't support CET])
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fi
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fi
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LIBC_CONFIG_VAR([enable-cet], [$enable_cet])
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