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configure: Override the os default with --disable-pie

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Some distributions, e.g. Ubuntu 19.10, enable PIE by default.
If for some reason one wishes to build a non-pie binary, we
must provide additional options to override.

At the same time, reorg the code to an elif chain.

Backports commit 2c674109c2da3f2e17b69f39e0b93b3f3d3dfa59 from qemu
This commit is contained in:
Richard Henderson 2020-04-30 07:07:37 -04:00 committed by Lioncash
parent 598083421b
commit f08ba73e78
1 changed files with 12 additions and 18 deletions
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30
qemu/configure vendored
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@ -865,24 +865,18 @@ if compile_prog "-Werror -fno-pie" "-no-pie"; then
LDFLAGS_NOPIE="-no-pie"
fi
if test "$pie" != "no" ; then
if compile_prog "-fPIE -DPIE" "-pie"; then
QEMU_CFLAGS="-fPIE -DPIE $QEMU_CFLAGS"
LDFLAGS="-pie $LDFLAGS"
pie="yes"
else
if test "$pie" = "yes"; then
error_exit "PIE not available due to missing toolchain support"
else
echo "Disabling PIE due to missing toolchain support"
pie="no"
fi
fi
if compile_prog "-fno-pie" "-nopie"; then
CFLAGS_NOPIE="-fno-pie"
LDFLAGS_NOPIE="-nopie"
fi
if test "$pie" = "no"; then
QEMU_CFLAGS="$CFLAGS_NOPIE $QEMU_CFLAGS"
QEMU_LDFLAGS="$LDFLAGS_NOPIE $QEMU_LDFLAGS"
elif compile_prog "-fPIE -DPIE" "-pie"; then
QEMU_CFLAGS="-fPIE -DPIE $QEMU_CFLAGS"
QEMU_LDFLAGS="-pie $QEMU_LDFLAGS"
pie="yes"
elif test "$pie" = "yes"; then
error_exit "PIE not available due to missing toolchain support"
else
echo "Disabling PIE due to missing toolchain support"
pie="no"
fi
# Detect support for PT_GNU_RELRO + DT_BIND_NOW.