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- #!/bin/sh
- # This script (and the embedded C code) will check that the actual
- # headers version match the user told us they were:
- #
- # - if both versions are the same, all is well.
- #
- # - if the actual headers are older than the user told us, this is
- # an error.
- #
- # - if the actual headers are more recent than the user told us, and
- # we are doing a strict check, then this is an error.
- #
- # - if the actual headers are more recent than the user told us, and
- # we are doing a loose check, then a warning is printed, but this is
- # not an error.
- BUILDDIR="${1}"
- SYSROOT="${2}"
- # Make sure we have enough version components
- HDR_VER="${3}.0.0"
- CHECK="${4}" # 'strict' or 'loose'
- HDR_M="${HDR_VER%%.*}"
- HDR_V="${HDR_VER#*.}"
- HDR_m="${HDR_V%%.*}"
- # Exit on any error, so we don't try to run an unexisting program if the
- # compilation fails.
- set -e
- # Set the clean-up trap in advance to prevent a race condition in which we
- # create the file but get a SIGTERM before setting it. Notice that we don't
- # need to care about EXEC being empty, since 'rm -f ""' does nothing.
- trap 'rm -f "${EXEC}"' EXIT
- EXEC="$(mktemp -p "${BUILDDIR}" -t .check-headers.XXXXXX)"
- # We do not want to account for the patch-level, since headers are
- # not supposed to change for different patchlevels, so we mask it out.
- # This only applies to kernels >= 3.0, but those are the only one
- # we actually care about; we treat all 2.6.x kernels equally.
- ${HOSTCC} -imacros "${SYSROOT}/usr/include/linux/version.h" \
- -x c -o "${EXEC}" - <<_EOF_
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- int main(int argc __attribute__((unused)),
- char** argv __attribute__((unused)))
- {
- int l = LINUX_VERSION_CODE & ~0xFF;
- int h = KERNEL_VERSION(${HDR_M},${HDR_m},0);
- if ((l >= h) && !strcmp("${CHECK}", "loose"))
- return 0;
- if (l != h) {
- printf("Incorrect selection of kernel headers: ");
- printf("expected %d.%d.x, got %d.%d.x\n", ${HDR_M}, ${HDR_m},
- ((LINUX_VERSION_CODE>>16) & 0xFF),
- ((LINUX_VERSION_CODE>>8) & 0xFF));
- return 1;
- }
- return 0;
- }
- _EOF_
- "${EXEC}"
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