87 lines
3.2 KiB
Plaintext
87 lines
3.2 KiB
Plaintext
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# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_extend_srcdir.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_EXTEND_SRCDIR
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#
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# DESCRIPTION
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#
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# The AX_EXTEND_SRCDIR macro extends $srcdir by one path component.
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#
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# As an example, when working in /home/michael/i3-4.12/build and calling
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# ../configure, your $srcdir is "..". After calling AX_EXTEND_SRCDIR,
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# $srcdir will be set to "../../i3-4.12".
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#
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# The result of extending $srcdir is that filenames (e.g. in the output of
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# the "backtrace" gdb command) will include one more path component of the
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# absolute source path. The additional path component makes it easy for
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# users to recognize which files belong to the PACKAGE, and -- provided a
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# dist tarball was unpacked -- which version of PACKAGE was used.
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#
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# As an example, in "backtrace", you will see:
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#
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# #0 main (argc=1, argv=0x7fffffff1fc8) at ../../i3-4.12/src/main.c:187
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#
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# instead of:
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#
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# #0 main (argc=1, argv=0x7fffffff1fc8) at ../src/main.c:187
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#
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# In case your code uses the __FILE__ preprocessor directive to refer to
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# the filename of the current source file (e.g. in debug messages), using
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# the extended path might be undesirable. For this purpose,
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# AX_EXTEND_SRCDIR defines the output variable AX_EXTEND_SRCDIR_CPPFLAGS,
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# which can be added to AM_CPPFLAGS in Makefile.am in order to define the
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# preprocessor directive STRIPPED__FILE__. As an example, when compiling
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# the file "../../i3-4.12/src/main.c", STRIPPED__FILE__ evaluates to
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# "main.c".
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#
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# There are some caveats: When $srcdir is "." (i.e. when ./configure was
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# called instead of ../configure in a separate build directory),
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# AX_EXTEND_SRCDIR will still extend $srcdir, but the intended effect will
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# not be achieved because of the way automake specifies file paths:
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# automake defines COMPILE to use "`test -f '$source' || echo
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# '\$(srcdir)/'`$source" in order to prefer files in the current directory
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# over specifying $srcdir explicitly.
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#
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# The AX_EXTEND_SRCDIR author is not aware of any way to influence this
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# automake behavior. Patches very welcome.
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#
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# To work around this issue, you can use AX_ENABLE_BUILDDIR i.e. by adding
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# the following code to configure.ac:
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#
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# AX_ENABLE_BUILDDIR
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# dnl ...
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# AX_EXTEND_SRCDIR
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#
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# Then also add this bit to Makefile.am (if you wish to use
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# STRIPPED__FILE__ in your code):
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#
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# AM_CPPFLAGS = @AX_EXTEND_SRCDIR_CPPFLAGS@
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#
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# LICENSE
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#
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# Copyright (c) 2016 Michael Stapelberg <michael@i3wm.org>
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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 3
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AC_DEFUN([AX_EXTEND_SRCDIR],
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[dnl
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AS_CASE([$srcdir],
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[.|.*|/*],
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[
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# pwd -P is specified in IEEE 1003.1 from 2004
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as_dir=`cd "$srcdir" && pwd -P`
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as_base=`AS_BASENAME([$as_dir])`
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srcdir=${srcdir}/../${as_base}
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AC_SUBST([AX_EXTEND_SRCDIR_CPPFLAGS], ["-DSTRIPPED__FILE__=AS_ESCAPE([\"$$(basename $<)\"])"])
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])
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])dnl AX_EXTEND_SRCDIR
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