Probably the same issue as what I ran into with dbcool(4) last week.
Look in files.acpi for a line that looks like
define acpi {}
and remove it (or comment it out).
On Wed, 21 Feb 2018, John D. Baker wrote:
Shortly after i386-current switched to GCC-6, my first (non-update) build
went fine. Since then, something changed and now configs which include:
tpm* at acpi?
fail with:
[...]
--- tpm_acpi.o ---
/x/current/src/sys/dev/acpi/tpm_acpi.c:88:27: error: 'tpm_acpi_ids' defined
but not used [-Werror=unused-const-variable=]
static const char * const tpm_acpi_ids[] = {
^~~~~~~~~~~~
[...]
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