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multipath-tools Makefiles: create config.mk
Rather than running the test scripts for certain system features every time "make" is called, save the configuration in "config.mk" and "libmultipath/autoconfig.h", and reuse it later. This reduces build time, especially in subsequent builds, and the build output is less garbled by compiler options. It works by invoking the separate make file "create-config.mk" at the beginning of the build process. Most of the complex makefile functions are moved to "create-config.mk". Signed-off-by: Martin Wilck <mwilck@suse.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,144 @@ | ||
| # Copyright (c) SUSE LLC | ||
| # SPDX-License-Identifier: GPL-2.0-or-later | ||
|
|
||
| TOPDIR := . | ||
| CREATE_CONFIG := 1 | ||
| include $(TOPDIR)/Makefile.inc | ||
|
|
||
| # Check whether a function with name $1 has been declared in header file $2. | ||
| check_func = $(shell \ | ||
| if grep -Eq "^[^[:blank:]]+[[:blank:]]+$1[[:blank:]]*(.*)*" "$2"; then \ | ||
| found=1; \ | ||
| status="yes"; \ | ||
| else \ | ||
| found=0; \ | ||
| status="no"; \ | ||
| fi; \ | ||
| echo 1>&2 "Checking for $1 in $2 ... $$status"; \ | ||
| echo "$$found" \ | ||
| ) | ||
|
|
||
| # Checker whether a file with name $1 exists | ||
| check_file = $(shell \ | ||
| if [ -f "$1" ]; then \ | ||
| found=1; \ | ||
| status="yes"; \ | ||
| else \ | ||
| found=0; \ | ||
| status="no"; \ | ||
| fi; \ | ||
| echo 1>&2 "Checking if $1 exists ... $$status"; \ | ||
| echo "$$found" \ | ||
| ) | ||
|
|
||
| # Check whether a file contains a variable with name $1 in header file $2 | ||
| check_var = $(shell \ | ||
| if grep -Eq "(^|[[:blank:]])$1([[:blank:]]|=|$$)" "$2"; then \ | ||
| found=1; \ | ||
| status="yes"; \ | ||
| else \ | ||
| found=0; \ | ||
| status="no"; \ | ||
| fi; \ | ||
| echo 1>&2 "Checking for $1 in $2 ... $$status"; \ | ||
| echo "$$found" \ | ||
| ) | ||
|
|
||
| # Test special behavior of gcc 4.8 with nested initializers | ||
| # gcc 4.8 compiles blacklist.c only with -Wno-missing-field-initializers | ||
| TEST_MISSING_INITIALIZERS = $(shell \ | ||
| echo 'struct A {int a, b;}; struct B {struct A a; int b;} b = {.a.a=1};' | \ | ||
| $(CC) -c -Werror -Wmissing-field-initializers -o /dev/null -xc - >/dev/null 2>&1 \ | ||
| || echo -Wno-missing-field-initializers) | ||
|
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||
| DEFINES := | ||
|
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||
| ifneq ($(call check_func,dm_task_no_flush,$(devmapper_incdir)/libdevmapper.h),0) | ||
| DEFINES += LIBDM_API_FLUSH | ||
| endif | ||
|
|
||
| ifneq ($(call check_func,dm_task_get_errno,$(devmapper_incdir)/libdevmapper.h),0) | ||
| DEFINES += LIBDM_API_GET_ERRNO | ||
| endif | ||
|
|
||
| ifneq ($(call check_func,dm_task_set_cookie,$(devmapper_incdir)/libdevmapper.h),0) | ||
| DEFINES += LIBDM_API_COOKIE | ||
| endif | ||
|
|
||
| ifneq ($(call check_func,udev_monitor_set_receive_buffer_size,$(libudev_incdir)/libudev.h),0) | ||
| DEFINES += LIBUDEV_API_RECVBUF | ||
| endif | ||
|
|
||
| ifneq ($(call check_func,dm_task_deferred_remove,$(devmapper_incdir)/libdevmapper.h),0) | ||
| DEFINES += LIBDM_API_DEFERRED | ||
| endif | ||
|
|
||
| ifneq ($(call check_func,dm_hold_control_dev,$(devmapper_incdir)/libdevmapper.h),0) | ||
| DEFINES += LIBDM_API_HOLD_CONTROL | ||
| endif | ||
|
|
||
| ifneq ($(call check_var,ELS_DTAG_LNK_INTEGRITY,$(kernel_incdir)/scsi/fc/fc_els.h),0) | ||
| DEFINES += FPIN_EVENT_HANDLER | ||
| FPIN_SUPPORT = 1 | ||
| endif | ||
|
|
||
| ifneq ($(call check_file,$(kernel_incdir)/linux/nvme_ioctl.h),0) | ||
| ANA_SUPPORT := 1 | ||
| endif | ||
|
|
||
| ifeq ($(ENABLE_DMEVENTS_POLL),0) | ||
| DEFINES += -DNO_DMEVENTS_POLL | ||
| endif | ||
|
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||
| SYSTEMD := $(strip $(or $(shell $(PKGCONFIG) --modversion libsystemd 2>/dev/null | awk '{print $$1}'), \ | ||
| $(shell systemctl --version 2>/dev/null | sed -n 's/systemd \([0-9]*\).*/\1/p'))) | ||
|
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||
|
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||
| # $(call TEST_CC_OPTION,option,fallback) | ||
| # Test if the C compiler supports the option. | ||
| # Evaluates to "option" if yes, and "fallback" otherwise. | ||
| TEST_CC_OPTION = $(shell \ | ||
| if echo 'int main(void){return 0;}' | \ | ||
| $(CC) -o /dev/null -c -Werror "$(1)" -xc - >/dev/null 2>&1; \ | ||
| then \ | ||
| echo "$(1)"; \ | ||
| else \ | ||
| echo "$(2)"; \ | ||
| fi) | ||
|
|
||
| # "make" on some distros will fail on explicit '#' or '\#' in the program text below | ||
| __HASH__ := \# | ||
| # Check if _DFORTIFY_SOURCE=3 is supported. | ||
| # On some distros (e.g. Debian Buster) it will be falsely reported as supported | ||
| # but it doesn't seem to make a difference wrt the compilation result. | ||
| FORTIFY_OPT := $(shell \ | ||
| if /bin/echo -e '$(__HASH__)include <string.h>\nint main(void) { return 0; }' | \ | ||
| $(CC) -o /dev/null -c -O2 -Werror -D_FORTIFY_SOURCE=3 -xc - 2>/dev/null; \ | ||
| then \ | ||
| echo "-D_FORTIFY_SOURCE=3"; \ | ||
| else \ | ||
| echo "-D_FORTIFY_SOURCE=2"; \ | ||
| fi) | ||
|
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||
| STACKPROT := | ||
|
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| all: $(multipathdir)/autoconfig.h $(TOPDIR)/config.mk | ||
|
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| $(multipathdir)/autoconfig.h: | ||
| @echo creating $@ | ||
| @echo '#ifndef _AUTOCONFIG_H' >$@ | ||
| @echo '#define _AUTOCONFIG_H' >>$@ | ||
| @for x in $(DEFINES); do echo "#define $$x" >>$@; done | ||
| @echo '#endif' >>$@ | ||
|
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||
| $(TOPDIR)/config.mk: | ||
| @echo creating $@ | ||
| @echo "FPIN_SUPPORT := $(FPIN_SUPPORT)" >$@ | ||
| @echo "FORTIFY_OPT := $(FORTIFY_OPT)" >>$@ | ||
| @echo "SYSTEMD := $(SYSTEMD)" >>$@ | ||
| @echo "ANA_SUPPORT := $(ANA_SUPPORT)" >>$@ | ||
| @echo "STACKPROT := $(call TEST_CC_OPTION,-fstack-protector-strong,-fstack-protector)" >>$@ | ||
| @echo "ERROR_DISCARDED_QUALIFIERS := $(call TEST_CC_OPTION,-Werror=discarded-qualifiers,)" >>$@ | ||
| @echo "WNOCLOBBERED := $(call TEST_CC_OPTION,-Wno-clobbered -Wno-error=clobbered,)" >>$@ | ||
| @echo "WFORMATOVERFLOW := $(call TEST_CC_OPTION,-Wformat-overflow=2,)" >>$@ | ||
| @echo "W_MISSING_INITIALIZERS := $(call TEST_MISSING_INITIALIZERS)" >>$@ |
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