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automake-1.16: Vala Support

 
 8.17 Vala Support
 =================
 
 Automake provides initial support for Vala
 (<https://www.vala-project.org/>).  This requires valac version 0.7.0 or
 later, and currently requires the user to use GNU ‘make’.
 
      foo_SOURCES = foo.vala bar.vala zardoz.c
 
    Any ‘.vala’ file listed in a ‘_SOURCES’ variable will be compiled
 into C code by the Vala compiler.  The generated ‘.c’ files are
 distributed.  The end user does not need to have a Vala compiler
 installed.
 
    Automake ships with an Autoconf macro called ‘AM_PROG_VALAC’ that
 will locate the Vala compiler and optionally check its version number.
 
  -- Macro: AM_PROG_VALAC ([MINIMUM-VERSION], [ACTION-IF-FOUND],
      [ACTION-IF-NOT-FOUND]) Search for a Vala compiler in ‘PATH’.  If it
      is found, the variable ‘VALAC’ is set to point to it (see below for
      more details).  This macro takes three optional arguments.  The
      first argument, if present, is the minimum version of the Vala API
      required to compile this package.  For Vala releases, this is the
      same as the major and minor release number; e.g., when ‘valac
      --version’ reports ‘0.48.7’, ‘valac --api-version’ reports ‘0.48’.
      If a compiler is found and satisfies MINIMUM-VERSION, then
      ACTION-IF-FOUND is run (this defaults to do nothing).  Otherwise,
      ACTION-IF-NOT-FOUND is run.  If ACTION-IF-NOT-FOUND is not
      specified, the default value is to print a warning in case no
      compiler is found, or if a too-old version of the compiler is
      found.
 
    There are a few variables that are used when compiling Vala sources:
 
 ‘VALAC’
      Absolute path to the Vala compiler, or simply ‘valac’ if no
      suitable Vala compiler could be found at configure runtime.
 
 ‘VALAFLAGS’
      Additional arguments for the Vala compiler.
 
 ‘AM_VALAFLAGS’
      The maintainer’s variant of ‘VALAFLAGS’.
 
           lib_LTLIBRARIES = libfoo.la
           libfoo_la_SOURCES = foo.vala
 
 Renamed Objects::) to produce different C files from one Vala source
 file.
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