0ac341f145
Bring in https://github.com/jedisct1/libsodium at 461ac93b260b91db8ad957f5a576860e3e9c88a1 (August 7, 2018), unmodified. libsodium is derived from Daniel J. Bernstein et al.'s 2011 NaCl ("Networking and Cryptography Library," pronounced "salt") software library. At the risk of oversimplifying, libsodium primarily exists to make it easier to use NaCl. NaCl and libsodium provide high quality implementations of a number of useful cryptographic concepts (as well as the underlying primitics) seeing some adoption in newer network protocols. I considered but dismissed cleaning up the directory hierarchy and discarding artifacts of other build systems in favor of remaining close to upstream (and easing future updates). Nothing is integrated into the build system yet, so in that sense, no functional change.
85 lines
3.3 KiB
Plaintext
85 lines
3.3 KiB
Plaintext
# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_check_gnu_make.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CHECK_GNU_MAKE()
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#
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# DESCRIPTION
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#
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# This macro searches for a GNU version of make. If a match is found:
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#
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# * The makefile variable `ifGNUmake' is set to the empty string, otherwise
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# it is set to "#". This is useful for including a special features in a
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# Makefile, which cannot be handled by other versions of make.
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# * The variable `_cv_gnu_make_command` is set to the command to invoke
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# GNU make if it exists, the empty string otherwise.
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# * The variable `ax_cv_gnu_make_command` is set to the command to invoke
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# GNU make by copying `_cv_gnu_make_command`, otherwise it is unset.
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# * If GNU Make is found, its version is extracted from the output of
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# `make --version` as the last field of a record of space-separated
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# columns and saved into the variable `ax_check_gnu_make_version`.
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#
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# Here is an example of its use:
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#
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# Makefile.in might contain:
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#
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# # A failsafe way of putting a dependency rule into a makefile
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# $(DEPEND):
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# $(CC) -MM $(srcdir)/*.c > $(DEPEND)
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#
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# @ifGNUmake@ ifeq ($(DEPEND),$(wildcard $(DEPEND)))
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# @ifGNUmake@ include $(DEPEND)
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# @ifGNUmake@ endif
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#
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# Then configure.in would normally contain:
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#
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# AX_CHECK_GNU_MAKE()
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# AC_OUTPUT(Makefile)
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#
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# Then perhaps to cause gnu make to override any other make, we could do
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# something like this (note that GNU make always looks for GNUmakefile
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# first):
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#
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# if ! test x$_cv_gnu_make_command = x ; then
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# mv Makefile GNUmakefile
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# echo .DEFAULT: > Makefile ;
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# echo \ $_cv_gnu_make_command \$@ >> Makefile;
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# fi
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#
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# Then, if any (well almost any) other make is called, and GNU make also
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# exists, then the other make wraps the GNU make.
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#
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# LICENSE
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#
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# Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au>
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# Copyright (c) 2015 Enrico M. Crisostomo <enrico.m.crisostomo@gmail.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 9
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AC_DEFUN([AX_CHECK_GNU_MAKE],dnl
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[AC_PROG_AWK
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AC_CACHE_CHECK([for GNU make],[_cv_gnu_make_command],[dnl
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_cv_gnu_make_command="" ;
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dnl Search all the common names for GNU make
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for a in "$MAKE" make gmake gnumake ; do
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if test -z "$a" ; then continue ; fi ;
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if "$a" --version 2> /dev/null | grep GNU 2>&1 > /dev/null ; then
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_cv_gnu_make_command=$a ;
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AX_CHECK_GNU_MAKE_HEADLINE=$("$a" --version 2> /dev/null | grep "GNU Make")
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ax_check_gnu_make_version=$(echo ${AX_CHECK_GNU_MAKE_HEADLINE} | ${AWK} -F " " '{ print $(NF); }')
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break ;
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fi
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done ;])
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dnl If there was a GNU version, then set @ifGNUmake@ to the empty string, '#' otherwise
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AS_VAR_IF([_cv_gnu_make_command], [""], [AS_VAR_SET([ifGNUmake], ["#"])], [AS_VAR_SET([ifGNUmake], [""])])
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AS_VAR_IF([_cv_gnu_make_command], [""], [AS_UNSET(ax_cv_gnu_make_command)], [AS_VAR_SET([ax_cv_gnu_make_command], [${_cv_gnu_make_command}])])
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AC_SUBST([ifGNUmake])
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])
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