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59 lines
2.1 KiB
Plaintext
59 lines
2.1 KiB
Plaintext
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# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_ext_check_header.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_EXT_CHECK_HEADER(<header>, <paths>).
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#
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# DESCRIPTION
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#
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# Check for <header> with -I<path> for each path in <paths> if need be.
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# The first sucecssful path is chosen (eg if you say
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# AX_EXT_CHECK_HEADER(foo.h, bar baz qux) and -Ibaz works then -Iqux will
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# not be tested.
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#
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# Any -I flags that locate a header are added to CFLAGS and CPPFLAGS. AS
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# with AC_CHECK_HEADERS it causes HAVE_<header>_H to be defined as 1.
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#
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# Example:
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#
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# AX_EXT_HAVE_HEADER(openssl/rsa.h, /usr/local/include /usr/local/ssl/include /usr/local/openssl/include)
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#
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# LICENSE
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#
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# Copyright (c) 2008 Duncan Simpson <dps@simpson.demon.co.uk>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 7
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AC_DEFUN([AX_EXT_HAVE_HEADER],
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[AC_LANG_PUSH(C)
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AC_CHECK_HEADER($1, [$3 got="yes"], [$4 got="no"], $5)
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hdr=`echo $1 | $as_tr_sh`
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for dir in $2; do
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if test "x${got}" = "xno"; then
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ext_hashdr_cvdir=`echo $dir | $as_tr_sh`
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AC_CACHE_CHECK([for $1 library with -I$dir],
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[ext_cv${ext_hashdr_cvdir}_hashdr_${hdr}],
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[ext_have_hdr_save_cflags=${CFLAGS}
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CFLAGS="${CFLAGS} -I${dir}"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([#include <$1>])],
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[got="yes"; eval "ext_cv${ext_hashdr_cvdir}_hashdr_${hdr}"="yes"],
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[got="no"; eval "ext_cv${ext_hashdr_cvdir}_hashdr_${hdr}"="no"])
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CFLAGS=$ext_have_hdr_save_cflags])
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if eval `echo 'test x${'ext_cv${ext_hashdr_cvdir}_hashdr_${hdr}'}' = "xyes"`; then
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CFLAGS="${CFLAGS} -I${dir}"
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CPPFLAGS="${CPPFLAGS} -I${dir}"
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got="yes";
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hdr=`echo $1 | $as_tr_cpp`
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AC_DEFINE_UNQUOTED(HAVE_${hdr}, 1,
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[Define this if you have the $1 header])
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fi; fi; done
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AC_LANG_POP])
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