gnu make - info guarded by conditional in recipe? -


we have library project , transitioning unaligned data access common in old i386/i686/x86_64 aligned data access. impetus gcc , vectorization, causing crashes @ -o3 (gcc vectorizing string compares sse4 primitives).

if runs make , particular define not present, want print info message warning them. i'm having trouble crafting recipe.

the following recipe produces error when run (it uses tab, , not spaces):

.phony check_defines check_defines:     config_aligned := $(shell $(egrep) -i -c "[[:space:]]*#[[:space:]]*define[[:space:]]*no_unaligned_data_access" config.h)     cxx_aligned := $(shell echo $(value cxxflags) | $(egrep) -i -c "-dno_unaligned_data_access")     ifeq ($(config_aligned)$(cxx_aligned),00)         $(info warning: no_unaligned_data_access not defined)     endif

the error is:

$ make check_defines gnumakefile:383: *** missing separator.  stop.

line 383 config_aligned := .... manual on 5.1 recipe syntax not helpful me.

how craft rule perform test within recipe?

makefiles not parsed script , executed imperatively. recipe not sub-routine.

the page linked explicitly tells body of recipe treated shell commands, not make declarations/expressions:

  • a variable definition in “rule context” indented tab first character on line, considered part of recipe, not make variable definition, , passed shell.
  • a conditional expression (ifdef, ifeq, etc. see syntax of conditionals) in “rule context” indented tab first character on line, considered part of recipe , passed shell.

so can't declare make variables or use make conditionals. can use shell commands.

try like:

config_aligned := $(shell $(egrep) -i -c "[[:space:]]*#[[:space:]]*define[[:space:]]*no_unaligned_data_access" config.h) cxx_aligned := $(shell echo $(value cxxflags) | $(egrep) -i -c "-dno_unaligned_data_access") ifeq ($(config_aligned)$(cxx_aligned),00) check_failed := 1 endif  .phony check_defines check_defines:         if [ $(check_failed) = 1 ]; echo warning: no_unaligned_data_access not defined; exit 1; fi

or check condition using shell:

config_aligned := $(shell $(egrep) -i -c "[[:space:]]*#[[:space:]]*define[[:space:]]*no_unaligned_data_access" config.h) cxx_aligned := $(shell echo $(value cxxflags) | $(egrep) -i -c "-dno_unaligned_data_access")  .phony check_defines check_defines:         if [ $(config_aligned)$(cxx_aligned) = 00 ]; echo warning: no_unaligned_data_access not defined; exit 1; fi

or shell, declaring shell variables instead of make variables:

.phony check_defines check_defines:         config_aligned=`$(egrep) -i -c "[[:space:]]*#[[:space:]]*define[[:space:]]*no_unaligned_data_access" config.h`         cxx_aligned=`echo $(value cxxflags) | $(egrep) -i -c "-dno_unaligned_data_access")`         if [ $${config_aligned}$${cxx_aligned} = 00 ]; echo warning: no_unaligned_data_access not defined; exit 1; fi

(this version might not work if cxxflags contains shell-outs such `pkg-config --cflags foo` confuse shell)


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