build: use CPPFLAGS instead of INCLUDE in compile targets #6159
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With this, CFLAGS and CPPFLAGS are used when compiling and LDFLAGS when
linking, just like in the built-in GNU make rules. From `make -p`:
COMPILE.c = $(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c
LINK.c = $(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH)
LINK.o = $(CC) $(LDFLAGS) $(TARGET_ARCH)
Note: It is unclear where the `INCLUDE` variable comes from; it is not
documented in autoconf nor GNU make and automake (which itself is not
used in this repository) only mentions `INCLUDES`:
`INCLUDES`
This does the same job as `AM_CPPFLAGS` (or any per-target
`_CPPFLAGS` variable if it is used). It is an older name for
the same functionality. This variable is deprecated; we
suggest using `AM_CPPFLAGS` and per-target `_CPPFLAGS` instead.
Environment: automake 1.16.5-2 and GNU make 4.4.1 on Artix Linux.
See also commit 671c3f2 ("build: actually set LDFLAGS and LIBS in
makefiles", 2022-11-30) / PR netblue30#5504.
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With this, CFLAGS and CPPFLAGS are used when compiling and LDFLAGS when
linking, just like in the built-in GNU make rules. From
make -p:Note: It is unclear where the
INCLUDEvariable comes from; it is notdocumented in autoconf nor GNU make and automake (which itself is not
used in this repository) only mentions
INCLUDES:Environment: automake 1.16.5-2 and GNU make 4.4.1 on Artix Linux.
See also commit 671c3f2 ("build: actually set LDFLAGS and LIBS in
makefiles", 2022-11-30) / PR #5504.