Brandon J. Van Every wrote:
If there's no way to perform a simple text substitution on a custom
build rule's COMMAND line, then that's really really irritating.
I still would like a text substitution macro, but I did find a
semi-elegant way around being stuck with DEPENDS in ADD_CUSTOM_COMMAND.
# A MACRO cannot be used within the COMMAND line of ADD_CUSTOM_COMMAND!
# This makes it really irritating to do variable substitutions and
# implement abstract rules. We're also stuck with using DEPENDS to
# specify our dependencies, there's no other way.
# In CMake 2.4.2, ADD_FILE_DEPENDENCIES will *not* work in
# conjunction with ADD_CUSTOM_COMMAND. It is meant to be
# used for .o file dependencies on .c files, not for
# source-file-to-source-file dependencies. We hack around this
# by creating a variable out of a file's name, shoving the
# desired dependencies into this variable, and shoving that into
# DEPENDS. Sorta like OO, heh, neato!
# Specify DEPLIST(root dep1 dep2 dep3 etc) before calling any of:
# SIMPLE_SCM_TO_C
# LIBRARY_SCM_TO_C
# UNSAFE_LIBRARY_SCM_TO_C
#
# After 'root', list the rootnames of any number of dependencies.
# ${Chicken_BINARY_DIR}/root.c is assumed
# $(Chicken_SOURCE_DIR)/deproots.scm is assumed for all dependencies.
# If these conditions aren't true, you'll need to write out
# a custom rule the long way.
MACRO(DEPLIST root)
# Put only variable args in deps.
SET(deproots ${ARGV})
LIST(REMOVE_ITEM deproots 0)
ADD_SUFFIX(deproots .scm)
SET(${root}_deplist ${deproots})
ENDMACRO(DEPLIST)
MACRO(SIMPLE_SCM_TO_C root)
ADD_CUSTOM_COMMAND(
OUTPUT ${Chicken_BINARY_DIR}/${root}.c
MAIN_DEPENDENCY ${root}.scm
DEPENDS ${${root}_deplist}
COMMAND ${VALID_CHICKEN} ${Chicken_SOURCE_DIR}/${root}.scm
-output-file ${Chicken_BINARY_DIR}/${root}.c ${CHICKEN_FLAGS}
)
ENDMACRO(SIMPLE_SCM_TO_C)
Typical usage:
DEPLIST(chicken build chicken-ffi-macros chicken-more-macros tweaks)
SIMPLE_SCM_TO_C(chicken)
Cheers,
Brandon Van Every
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