Blame sysdeps/ieee754/ldbl-opt/configure.ac
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sinclude(./aclocal.m4)dnl Autoconf lossage
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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/ieee754/ldbl-opt/.
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AC_CACHE_CHECK(whether $CC $CFLAGS supports -mlong-double-128,
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libc_cv_mlong_double_128, [dnl
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save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -mlong-double-128"
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AC_TRY_COMPILE(, [
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#ifndef __LONG_DOUBLE_128__
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# error "compiler did not predefine __LONG_DOUBLE_128__ as expected"
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#endif
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long double foobar (long double x) { return x; }],
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libc_cv_mlong_double_128=yes,
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libc_cv_mlong_double_128=no)
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CFLAGS="$save_CFLAGS"])
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if test "$libc_cv_mlong_double_128" = no; then
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AC_MSG_ERROR([this configuration requires -mlong-double-128 support])
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fi
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