check_header is defined in cond.mk.
Makefiles in other test cases can use the macro.
signalfd/Makefile is the first applicant to use it.
Signed-off-by: Masatake YAMATO <[EMAIL PROTECTED]>
# cond.mk --- useful functions to write conditions
#
# Copyright (c) International Business Machines Corp., 2001
# Copyright (c) Red Hat, Inc., 2008
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
# the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# NAME
# check_header: Checking the existence of header file.
#
# SYNOPSIS
# $(call check_header,HEADFILE)
# $(call check_header,HEADFILE,STRING_IF_FOUND)
# $(call check_header,HEADFILE,STRING_IF_FOUND,STRING_IF_NOT_FOUND)
#
# DESCRIPTION
#
# check_header checks whether $(CC) can found HEADFILE or not.
#
# With the first form, "yes" is returned if it is found.
# "no" is returned if it is not found.
#
# With the second form, STRING_IF_FOUND is returned if it is found.
# "no" is returned if it is not found.
#
# With the second form, STRING_IF_FOUND is returned if it is found.
# STRING_IF_NOT_FOUND is returned if it is not found.
#
# EXAMPLES
#
# (1) yes or no
#
# include ../utils/cond.mk
#
# ifeq ($(call check_header,foo.h),yes)
# RULES if foo.h is available.
# else
# RULES IF foo.h is NOT available.
# endif
#
#
# (2) adding CFLAGS# CFLAGS += $(call check_header,foo.h,-DHAS_FOO_H, )
#
# CFLAGS += $(call check_header,foo.h,-DHAS_FOO_H, )
#
#
# NOTE
#
# Spaces after `,' are not striped automatically.
#
# The value for CFLAGS is different in following assignment:
#
# CFLAGS += $(call check_header,foo.h,-DHAS_FOO_H, )
# CFLAGS += $(call check_header,foo.h,-DHAS_FOO_H,)
#
check_header = $(shell
\
if [ "x$(2)" = "x" ]; then FOUND=yes; else FOUND="$(2)"; fi;
\
if [ "x$(3)" = "x" ]; then NOTFOUND=no; else NOTFOUND="$(3)"; fi;
\
if echo "\#include <$(1)>" | $(CC) -E - > /dev/null 2>&1 ;
\
then echo "$${FOUND}" ;
\
else echo "$${NOTFOUND}" ; fi)
#COND_MK_DEBUG=yes
ifdef COND_MK_DEBUG
all:
@echo "-DHAS_STDIO_H == $(call check_header,stdio.h,-DHAS_STDIO_H,)"
@echo "\" \" == \"$(call check_header,foo.h,-DHAS_FOO_H, )\""
@echo "yes == $(call check_header,stdio.h)"
@echo "no == $(call check_header,foo.h)"
@echo "YES == $(call check_header,stdio.h,YES)"
@echo "no == $(call check_header,foo.h,YES)"
@echo "YES == $(call check_header,stdio.h,YES,NO)"
@echo "NO == $(call check_header,foo.h,YES,NO)"
endif
# cond.mk ends here.
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