glibc/sysdeps/i386/Makefile

# The mpn functions need a #define for asm syntax flavor.
# Every i386 port in use uses gas syntax (I think).
asm-CPPFLAGS += -DGAS_SYNTAX

# The i386 `long double' is a distinct type we support.
long-double-fcts = yes

ifeq ($(subdir),string)
sysdep_routines += cacheinfo
endif

ifeq ($(subdir),gmon)
sysdep_routines += i386-mcount
endif

ifeq ($(subdir),elf)
CFLAGS-rtld.c += -Wno-uninitialized -Wno-unused
CFLAGS-dl-load.c += -Wno-unused
CFLAGS-dl-reloc.c += -Wno-unused
endif

# Most of the glibc routines don't ever call user defined callbacks
# nor use any FPU or SSE* and as such don't need bigger %esp alignment
# than 4 bytes.
# Lots of routines in math will use FPU, so make math subdir an exception
# here.
# In gcc 4.6 (and maybe earlier?) giving -mpreferred-stack-boundary=2 is
# an error, so don't try to reduce it here like we used to.  We still
# explicit set -mpreferred-stack-boundary=4 the places where it matters,
# in case an older compiler defaulted to 2.
ifeq ($(subdir),math)
sysdep-CFLAGS += -mpreferred-stack-boundary=4
else
ifeq ($(subdir),csu)
sysdep-CFLAGS += -mpreferred-stack-boundary=4
gen-as-const-headers += link-defines.sym
else
# Likewise, any function which calls user callbacks
uses-callbacks += -mpreferred-stack-boundary=4
# Likewise, any stack alignment tests
stack-align-test-flags += -malign-double -mpreferred-stack-boundary=4
endif
endif

# And a couple of other routines
ifeq ($(subdir),stdlib)
CFLAGS-exit.c += -mpreferred-stack-boundary=4
CFLAGS-cxa_finalize.c += -mpreferred-stack-boundary=4
endif
ifeq ($(subdir),elf)
CFLAGS-dl-init.c += -mpreferred-stack-boundary=4
CFLAGS-dl-fini.c += -mpreferred-stack-boundary=4
CFLAGS-dl-open.c += -mpreferred-stack-boundary=4
CFLAGS-dl-close.c += -mpreferred-stack-boundary=4
CFLAGS-dl-error.c += -mpreferred-stack-boundary=4
endif
ifeq ($(subdir),dlfcn)
CFLAGS-dlopen.c += -mpreferred-stack-boundary=4
CFLAGS-dlopenold.c += -mpreferred-stack-boundary=4
CFLAGS-dlclose.c += -mpreferred-stack-boundary=4
CFLAGS-dlerror.c += -mpreferred-stack-boundary=4
endif

ifneq (,$(filter -mno-tls-direct-seg-refs,$(CFLAGS)))
defines += -DNO_TLS_DIRECT_SEG_REFS
endif

ifeq ($(subdir),elf)
sysdep-dl-routines += tlsdesc dl-tlsdesc

tests += tst-audit3
modules-names += tst-auditmod3a tst-auditmod3b

$(objpfx)tst-audit3: $(objpfx)tst-auditmod3a.so
$(objpfx)tst-audit3.out: $(objpfx)tst-auditmod3b.so
tst-audit3-ENV = LD_AUDIT=$(objpfx)tst-auditmod3b.so
endif

ifeq ($(subdir),csu)
gen-as-const-headers += tlsdesc.sym
endif

# Make sure no code in ld.so uses mm/xmm/ymm/zmm registers on i386 since
# the first 3 mm/xmm/ymm/zmm registers are used to pass vector parameters
# which must be preserved.
# With SSE disabled, ensure -fpmath is not set to use sse either.
rtld-CFLAGS += -mno-sse -mno-mmx -mfpmath=387
ifeq ($(subdir),elf)
CFLAGS-.os += $(if $(filter $(@F),$(patsubst %,%.os,$(all-rtld-routines))),\
		   $(rtld-CFLAGS))

tests-special += $(objpfx)tst-ld-sse-use.out
$(objpfx)tst-ld-sse-use.out: ../sysdeps/i386/tst-ld-sse-use.sh $(objpfx)ld.so
	@echo "Checking ld.so for SSE register use.  This will take a few seconds..."
	$(BASH) $< $(objpfx) '$(NM)' '$(OBJDUMP)' '$(READELF)' > $@; \
	$(evaluate-test)
else
CFLAGS-.os += $(if $(filter rtld-%.os,$(@F)), $(rtld-CFLAGS))
endif