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change macOS to not use "-dead_strip_dylibs" when CUSTOM is defined

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Under macOS, to reduce dependency chains, we remove functions and
data that are unreachable by the entry point or exported symbols.
In particular, the macOS linker is used with "-dead_strip".

While calc on macOS will execute if linker used with "-dead_strip_dylibs"
and CUSTOM is defined, other applications that use libcalc but not
libcustcalc (such as sample_many and sample_rand) will fail to execute
due to missile symbols.  Therefore "-dead_strip_dylibs" is not used
by default when ALLOW_CUSTOM is "-DCUSTOM" under macOS.
This commit is contained in:
Landon Curt Noll
2023-08-14 17:08:28 -07:00
parent af9b052fe9
commit 7d8d4cb5ea
5 changed files with 34 additions and 24 deletions
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15
Makefile.target
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@@ -177,7 +177,22 @@ LIBCUSTCALC_SHLIB= -dynamiclib -undefined dynamic_lookup \
# data that are unreachable by the entry point or exported symbols.
#
COMMON_LDFLAGS+= -Wl,-dead_strip
# Do not link with "-dead_strip_dylibs" if CUSTOM is defined
# (i.e., ${ALLOW_CUSTOM} is "-DCUSTOM). This is because unless
# the application makes an explicit symbol reference to some symbol
# in libcustcalc, the application will fail to execute due to
# a missing symbol.
#
# The calc application will run with CUSTOM defined under
# "-dead_strip_dylibs" because calc.o (in main()) makes an explicit
# reference to custtbl_allowed (see custom/custtbl.c) in libcustcalc.
# However applications such as sample_many and sample_rand will
# fail to load when CUSTOM is defined and "-dead_strip_dylibs" is used..
#
ifneq ($(ALLOW_CUSTOM),-DCUSTOM)
COMMON_LDFLAGS+= -Wl,-dead_strip_dylibs
endif # ($(ALLOW_CUSTOM),-DCUSTOM)
# static library option
#