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