Unlike variable assignments, rules--including overrides of built-in pattern rules--are not inherited by recursively invoked instances of make. They have to be in a makefile read by the instance of make that needs them.
(GNU makes built-in rules and variables have TARGET_ARCH for basically all types of compilation. IMHO, if you have options that don't apply to, for example, .S files, then why not put them in CFLAGS *directly* and not in TARGET_ARCH? Or just use your own variable name (e.g., "targ_arch") instead of trying to give your own use/meaning to a variable which is already in use. Fighting the builtin rules is a bad use of your time.) Philip Guenther On Fri, Sep 3, 2021 at 12:58 PM Jeffrey.Fellin--- via Bug reports and discussion for GNU make <bug-make@gnu.org> wrote: > I have a project that compiles .S and .c files, and the value of CFLAGS in > the sub makefile is not the same for the compile lines > > > > The version of make is > > GNU Make 3.82 > > Built for x86_64-redhat-linux-gnu > > Copyright (C) 2010 Free Software Foundation, Inc. > > > > I’m attaching a tarball containing the following files, for ease in > reproducing the problem > > cflags_bug/make_top > > cflags_bug/base/sub_make > > cflags_bug/base/src/bug.S > > cflags_bug/base/src/hello.c > > > > The compile of bug.S succeeds, but doesn’t have the correct value of > CFLAGS, as in the annotated output below. The compile of hello.c has the > correct value of CFLAGS, but the compile fails due to the unsupported > options to the cc. The extra options are for use by the project specific > compiler. > > > > The top make undefines the default rules for %.o:%.c and %.o:%.S, has my > understanding from these documents: > > Managing Projects with BNU Make, Third Edition, > > GNU Make pdf, Section 10.5.5 Match-Anything Pattern Rules > > > > The annotated execution of make -f make_top, supplied in the cflags_bug.tar > > $ make -ikf make_top;exit > > (cd base && make -f sub_make all) > > make[1]: Entering directory `/home/jfellin/cflags_bug/base' > > # This displays the value of CFLAGS that should be use in the > > # compilation of the .S and .c files > > # the compile errors are not important, but the different > > # value of CFLAGS, which are expected to be the same. > > > > # Also note the top make file removes the default rule for %.o:%.[Sc], but > > # the default rules are still being used. > > > > # Expected value in compile *.S and *.c > > check CFLAGS=-DTOP_MAKE -Wall -I base/inc -mlittle-endian > --target=aarch64-arm-none-eabi -mcpu=cortex-a53+nocrypto+nofp+nosimd > -mno-unaligned-access -mfpu=None -O -MD -I > /home/jfellin/cflags_bug/base/../base/inc -D BASE_MAKE > > > > > > # Note this value of CFLAGS is not the one printed above > > cc -c -o /home/jfellin/cflags_bug/base/../base/src/bug.o > /home/jfellin/cflags_bug/base/../base/src/bug.S > > > > > > # Note this value of CFLAGS is the one printed by the check_cflag rule > > # in the file, sub_make, > > cc -DTOP_MAKE -Wall -I base/inc -mlittle-endian > --target=aarch64-arm-none-eabi -mcpu=cortex-a53+nocrypto+nofp+nosimd > -mno-unaligned-access -mfpu=None -O -MD -I > /home/jfellin/cflags_bug/base/../base/inc -D BASE_MAKE -mlittle-endian > --target=aarch64-arm-none-eabi -mcpu=cortex-a53+nocrypto+nofp+nosimd > -mno-unaligned-access -mfpu=None -c -o > /home/jfellin/cflags_bug/base/../base/src/hello.o > /home/jfellin/cflags_bug/base/../base/src/hello.c > > cc: warning: \u2018-mcpu=\u2019 is deprecated; use \u2018-mtune=\u2019 or > \u2018-march=\u2019 instead > > cc: warning: \u2018-mcpu=\u2019 is deprecated; use \u2018-mtune=\u2019 or > \u2018-march=\u2019 instead > > cc: error: unrecognized command line option \u2018-mlittle-endian\u2019 > > cc: error: unrecognized command line option > \u2018-mno-unaligned-access\u2019 > > cc: error: unrecognized command line option \u2018-mfpu=None\u2019 > > cc: error: unrecognized command line option \u2018-mlittle-endian\u2019 > > cc: error: unrecognized command line option > \u2018-mno-unaligned-access\u2019 > > cc: error: unrecognized command line option \u2018-mfpu=None\u2019 > > make[1]: [/home/jfellin/cflags_bug/base/../base/src/hello.o] Error 1 > (ignored) > > make[1]: Leaving directory `/home/jfellin/cflags_bug/base' > > > > Jeff > > >
