96 lines
3.7 KiB
Plaintext
96 lines
3.7 KiB
Plaintext
# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_check_library.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CHECK_LIBRARY(VARIABLE-PREFIX, HEADER-FILE, LIBRARY-FILE,
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# [ACTION-IF-FOUND], [ACTION-IF-NOT_FOUND])
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#
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# DESCRIPTION
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#
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# Provides a generic test for a given library, similar in concept to the
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# PKG_CHECK_MODULES macro used by pkg-config.
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#
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# Most simplest libraries can be checked against simply through the
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# presence of a header file and a library to link to. This macro allows to
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# wrap around the test so that it doesn't have to be recreated each time.
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#
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# Rather than define --with-$LIBRARY arguments, it uses variables in the
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# same way that PKG_CHECK_MODULES does. It doesn't, though, use the same
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# names, since you shouldn't provide a value for LIBS or CFLAGS but rather
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# for LDFLAGS and CPPFLAGS, to tell the linker and compiler where to find
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# libraries and headers respectively.
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#
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# If the library is find, HAVE_PREFIX is defined, and in all cases
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# PREFIX_LDFLAGS and PREFIX_CPPFLAGS are substituted.
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#
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# Example:
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#
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# AX_CHECK_LIBRARY([LIBEVENT], [event.h], [event], [],
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# [AC_MSG_ERROR([Unable to find libevent])])
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#
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# LICENSE
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#
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# Copyright (c) 2010 Diego Elio Petteno` <flameeyes@gmail.com>
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation, either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 5
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AC_DEFUN([AX_CHECK_LIBRARY], [
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AC_ARG_VAR($1[_CPPFLAGS], [C preprocessor flags for ]$1[ headers])
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AC_ARG_VAR($1[_LDFLAGS], [linker flags for ]$1[ libraries])
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AC_CACHE_VAL(AS_TR_SH([ax_cv_have_]$1),
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[save_CPPFLAGS="$CPPFLAGS"
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save_LDFLAGS="$LDFLAGS"
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save_LIBS="$LIBS"
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AS_IF([test "x$]$1[_CPPFLAGS" != "x"],
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[CPPFLAGS="$CPPFLAGS $]$1[_CPPFLAGS"])
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AS_IF([test "x$]$1[_LDFLAGS" != "x"],
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[LDFLAGS="$LDFLAGS $]$1[_LDFLAGS"])
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AC_CHECK_HEADER($2, [
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AC_CHECK_LIB($3, [main],
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[AS_TR_SH([ax_cv_have_]$1)=yes],
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[AS_TR_SH([ax_cv_have_]$1)=no])
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], [AS_TR_SH([ax_cv_have_]$1)=no])
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CPPFLAGS="$save_CPPFLAGS"
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LDFLAGS="$save_LDFLAGS"
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LIBS="$save_LIBS"
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])
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AS_IF([test "$]AS_TR_SH([ax_cv_have_]$1)[" = "yes"],
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AC_DEFINE([HAVE_]$1, [1], [Define to 1 if ]$1[ is found])
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[$4],
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[$5])
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])
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