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qemu: disable fno-semantic-interposition for old gcc

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We can only set disable fno-semantic-interposition if the
gcc used to build qemu is 5.3 or newer.
CentOS provides an older gcc, then we need to not enable this
option if it is the case.

Fixes #32.

Signed-off-by: Salvador Fuentes <salvador.fuentes@intel.com>
This commit is contained in:
Salvador Fuentes 2018-05-15 16:23:27 -05:00
parent 3295f8a5db
commit b78ecea3a2
1 changed files with 12 additions and 1 deletions
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13
scripts/configure-hypervisor.sh
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@ -196,6 +196,14 @@ main()
[ -n "${qemu_version_minor}" ] \
|| die "cannot determine qemu minor version from file $qemu_version_file"
local gcc_version_major=$(gcc -dumpversion | cut -f1 -d.)
local gcc_version_minor=$(gcc -dumpversion | cut -f2 -d.)
[ -n "${gcc_version_major}" ] \
|| die "cannot determine gcc major version, please ensure it is installed"
[ -n "${gcc_version_minor}" ] \
|| die "cannot determine gcc minor version, please ensure it is installed"
arch=$(arch)
# Array of configure options.
@ -362,7 +370,10 @@ main()
# Improve code quality by assuming identical semantics for interposed
# synmbols.
_qemu_cflags+=" -fno-semantic-interposition"
# Only enable if gcc is 5.3 or newer
if [ "${gcc_version_major}" -ge 5 ] && [ "${gcc_version_minor}" -ge 3 ]; then
_qemu_cflags+=" -fno-semantic-interposition"
fi
# Performance optimisation
_qemu_cflags+=" -falign-functions=32"