new module 'hasmntopt'

[Bruno Haible]

In GNU libffcall, I need to use the function hasmntopt(). Since it does not
exist on Android API levels <= 25, I'm adding a gnulib module for it.

The unit tests of this module reveal that the implementation of hasmntopt()
is broken on musl libc: it confuses the "atime" option with the "noatime"
option; but these options have opposite meanings.

These patches provide the module, with the necessary override.


2024-08-19  Bruno Haible  <bruno@clisp.org>

        hasmntopt: Add tests.
        * tests/test-hasmntopt.c: New file.
        * modules/hasmntopt-tests: New file.

        hasmntopt: New module.
        * lib/mntent.in.h: Add config.h check.
        (hasmntopt): New declaration.
        * lib/hasmntopt.c: New file, based on glibc/misc/mntent_r.c.
        * m4/hasmntopt.m4: New file.
        * m4/mntent_h.m4 (gl_MNTENT_H): Test whether hasmntopt is declared.
        (gl_MNTENT_H_REQUIRE_DEFAULTS): Initialize GNULIB_HASMNTOPT.
        (gl_MNTENT_H_DEFAULTS): Initialize HAVE_HASMNTOPT, HAVE_SETMNTENT,
        REPLACE_HASMNTOPT.
        * modules/mntent (Depends-on): Add snippet/arg-nonnull, snippet/c++defs,
        snippet/warn-on-use.
        (Makefile.am): Insert c++defs.h, arg-nonnull.h, warn-on-use.h into
        mntent.h. Substitute GNULIB_HASMNTOPT, HAVE_HASMNTOPT, HAVE_SETMNTENT,
        REPLACE_HASMNTOPT.
        * modules/hasmntopt: New file.
        * doc/glibc-functions/hasmntopt.texi: Mention the new module and the
        musl bug.
        * doc/glibc-functions/setmntent.texi: Update info about Android.
        * doc/glibc-functions/getmntent_r.texi: Likewise.
        * doc/glibc-functions/endmntent.texi: Likewise.

2024-08-19  Bruno Haible  <bruno@clisp.org>

        mntent: New module.
        * lib/mntent.in.h: New file.
        * m4/mntent_h.m4: New file.
        * modules/mntent: New file.
        * doc/glibc-headers/mntent.texi: Mention the new module.
        * top/maint.mk (gl_prefer_angle_bracket_headers_): Add mntent.h.
        * doc/gnulib-tool.texi (Style of #include statements): Add mntent.h to
        the list.

0001-mntent-New-module.patch
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0002-hasmntopt-New-module.patch
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0003-hasmntopt-Add-tests.patch
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