# vlibc — benchmark harnesses (musts/BENCHMARKING.md).

# Build-dir include FIRST (generated features.h lives there in VPATH builds).
AM_CPPFLAGS = -I$(top_builddir)/include -I$(top_srcdir)/include
AM_CFLAGS = @VLIBC_CFLAGS@

# Built only on demand (via `make bench`), so `make all` does not need the
# library to be built first.
EXTRA_PROGRAMS = bench_vlibc bench_string
bench_vlibc_SOURCES = bench_vlibc.c
bench_string_SOURCES = bench_string.c

# Both harness TUs are system-headers-only translation units (they time
# whichever libc they are linked against), so they must NOT inherit
# AM_CPPFLAGS: -I include would pull vlibc's self-contained
# <stdarg.h>/<stddef.h>/<string.h> into the same TU as the system
# <stdio.h>/<time.h> and double-define size_t/NULL/offsetof (or hide the
# compiler's internal <stdarg.h> behind vlibc's). The vlibc function under
# test is reached through the adapter TU bench_vlibc_under.c, which is
# compiled with vlibc's headers and exposes the call to the harness through
# its own declaration (see that file).
bench_vlibc_CPPFLAGS =
bench_string_CPPFLAGS =

# Adapter TU for bench_vlibc: vlibc's headers only, so it must NOT inherit
# the (empty) per-target CPPFLAGS above; it gets the include path back
# explicitly.
bench_vlibc_under.o: bench_vlibc_under.c
	$(AM_V_CC)$(CC) -I$(top_srcdir)/include $(CPPFLAGS) $(AM_CFLAGS) \
	    $(CFLAGS) -c -o $@ $<

# By default benchmarks link against vlibc itself. --with-libc=glibc links the
# same harness against the system glibc; --with-libc=musl builds it with
# musl-gcc for the musl reference.
if BENCH_LINK_VLIBC
bench_vlibc_LDADD = bench_vlibc_under.o ../libvlibc.la
bench_string_LDADD = ../libvlibc.la
else
bench_vlibc_LDADD =
bench_string_LDADD =
endif

if BENCH_LINK_MUSL
CC = $(MUSL_CC)
endif

# Relink whenever the configuration changes (autogen.sh reruns configure and
# rewrites config.status). --with-libc only affects the link (LDADD), and the
# objects are compile-time identical, so make would otherwise reuse a stale
# binary from the previous configuration and the wrong libc would be measured.
EXTRA_bench_string_DEPENDENCIES = $(top_builddir)/config.status
EXTRA_bench_vlibc_DEPENDENCIES = $(top_builddir)/config.status
bench_vlibc_DEPENDENCIES = bench_vlibc_under.o

# The adapter TU is built by a hand-rolled rule (per-TU include paths), so it
# is not picked up by automake's automatic distribution/cleaning.
EXTRA_DIST = bench_vlibc_under.c
CLEANFILES = bench_vlibc_under.o

# bench_vlibc.c calls vlibc_version(), which exists only in vlibc — under
# --with-libc=glibc/musl it cannot link, so it is built and run only in the
# vlibc build. bench_string links either way and runs always.
if BENCH_LINK_VLIBC
bench: bench_vlibc bench_string
	./bench_vlibc
	./bench_string
else
bench: bench_string
	./bench_string
endif

.PHONY: bench