[Automake-commit] [SCM] GNU Automake branch, silent-fixes, created. v1.11-598-g8493499

[Paul Eggert]

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http://git.sv.gnu.org/gitweb/?p=automake.git;a=commitdiff;h=8493499b54da3694f820fa7eab5e58ef44448b66

The branch, silent-fixes has been created
        at  8493499b54da3694f820fa7eab5e58ef44448b66 (commit)

- Log -----------------------------------------------------------------
commit 8493499b54da3694f820fa7eab5e58ef44448b66
Author: Paul Eggert <address@hidden>
Date:   Sun Dec 25 09:56:44 2011 -0800

    silent-rules: fallback for makes without nested vars
    
    This fixes two problems reported for Automake (Bug#9928, Bug#10237)
    and is in response to a bug report for building coreutils on HP
    NonStop OS (Bug#10234).  The problem is that HP NonStop 'make'
    treats a line like "AM_V_CC = $(am__v_CC_$(V))" as one that
    expands a macro with the funny name am__v_CC_$(V instead of the
    desired name am__v_CC_1 or am__v_CC_0, and since the funny macro
    is not defined the line is equivalent to "AM_V_CC = )"; this
    inserts a stray ")" when $(AM_V_CC) is used, which eventually
    causes 'make' to fail.
    
    The basic idea is that instead of generating Makefile.in lines like
    "AM_V_CC = $(am__v_CC_$(V))", we generate
    "AM_V_CC = $(address@hidden@)".  We then AC_SUBST $(V) for @AM_V@
    in the usual case where `make' supports nested variables,
    and substitute 1 (or 0) otherwise.  Similarly for usages like
    $(am__v_CC_$(AM_DEFAULT_VERBOSITY)).
    
    With this change, make implementations that doesn't grasp nested
    variable expansions will still be able to run Makefiles generated
    using the silent-rules option.  They won't allow the user to
    override the make verbosity at runtime through redefinition of
    $(V) (as in "make V=0"); but this is still an improvement over not
    being able to work at all.
    
    * NEWS: Document this.
    * automake.in (define_verbose_var): When defining the variables,
    use @AM_V@ rather than $(V), and use @AM_DEFAULT_V@ rather than
    $(AM_DEFAULT_VERBOSITY).
    * doc/automake.texi (Automake silent-rules Option): Explain new system.
    * m4/silent.m4 (AM_SILENT_RULES): Check whether `make' supports
    nested variables, and substitute AM_V and AM_DEFAULT_V accordingly.
    * tests/silent-nested-vars.test: New test.
    * tests/Makefile.am (TESTS): Add it.

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