I recently tried to update man-db to current Gnulib, running in a Debian unstable chroot, and I ran into some Autoconf macro issues that I don't entirely understand. I've boiled it down as far as this, with current Gnulib master (4bed390be8) and Autoconf 2.71:
$ ./gnulib-tool --dir x --create-testdir btowc [...] executing autoconf configure.ac:584: warning: GL_STDLIB_H_MODULE_INDICATOR_DEFAULTS is m4_require'd but not m4_defun'd glm4/wchar_h.m4:144: gl_WCHAR_H_REQUIRE_DEFAULTS is expanded from... glm4/wchar_h.m4:132: gl_WCHAR_MODULE_INDICATOR is expanded from... configure.ac:35: gl_INIT is expanded from... configure.ac:584: the top level And indeed the resulting configure script contains an unexpanded macro, resulting in: ./configure: line 8730: GL_STDLIB_H_MODULE_INDICATOR_DEFAULTS: command not found I initially suspected an incompatibility with Autoconf >= 2.70, since there were lots of changes there, but I tried the same gnulib-tool test with Autoconf 2.69 and it does the same thing. When I "git blame m4/wchar_h.m4", I find the recent commit 4bed390be8, which added the line "m4_require(GL_MODULE_INDICATOR_PREFIX[_STDLIB_H_MODULE_INDICATOR_DEFAULTS])". And indeed, when I back out that commit, things work again; but it was tagged as a regression fix, so evidently something else breaks. CCing Bruno since this was their commit and they might want to have a look. Thanks, -- Colin Watson (he/him) [cjwat...@debian.org]
