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Makefile.flags: add a test for -lrt availability

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2021-04-14 19:01:53 +02:00
parent 7c813fbabf
commit eb1b2902b8
1 changed files with 8 additions and 5 deletions
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13
Makefile.flags
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@ -145,18 +145,21 @@ CFLAGS += --sysroot=$(CONFIG_SYSROOT)
export SYSROOT=$(CONFIG_SYSROOT)
endif
# libm may be needed for dc, awk, ntpd
LDLIBS += m
# Android has no separate crypt library
# gcc-4.2.1 fails if we try to feed C source on stdin:
# echo 'int main(void){return 0;}' | $(CC) $(CFLAGS) -lcrypt -o /dev/null -xc -
# fall back to using a temp file:
CRYPT_AVAILABLE := $(shell echo 'int main(void){return 0;}' >crypttest.c; $(CC) $(CFLAGS) -lcrypt -o /dev/null crypttest.c >/dev/null 2>&1 && echo "y"; rm crypttest.c)
CRYPT_AVAILABLE := $(shell echo 'int main(void){return 0;}' >bb_libtest.c; $(CC) $(CFLAGS) -lcrypt -o /dev/null bb_libtest.c >/dev/null 2>&1 && echo "y"; rm bb_libtest.c)
RT_AVAILABLE := $(shell echo 'int main(void){return 0;}' >bb_libtest.c; $(CC) $(CFLAGS) -lrt -o /dev/null bb_libtest.c >/dev/null 2>&1 && echo "y"; rm bb_libtest.c)
ifeq ($(CRYPT_AVAILABLE),y)
LDLIBS += m rt crypt
else
LDLIBS += m rt
LDLIBS += crypt
endif
# libm may be needed for dc, awk, ntpd
# librt may be needed for clock_gettime()
ifeq ($(RT_AVAILABLE),y)
LDLIBS += rt
endif
# libpam may use libpthread, libdl and/or libaudit.
# On some platforms that requires an explicit -lpthread, -ldl, -laudit.