kc3-lang/automake/tests/silent-lex-gcc.test

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• Hash : b5c39684
  Author :
  Date : 2011-10-24T23:18:34
  

  tests: fix spurious failures due to missing 'yywrap()' function
  
  The AC_PROG_LEX Autoconf macro does not diagnose a failure to find
  the "lex library" expected to provide a `yywrap' function (function
  which is required to link most lex-generated programs).  On the
  contrary, when all the link attempts (i.e., with `-ll' and `-lfl')
  fail, configure declares that no lex library is needed, and simply
  proceeds with the configuration process -- only for the build to
  possibly fail later, at make time.
  
  This behaviour is intended; the Autoconf manual reads:
   ``You are encouraged to use Flex in your sources, since it is
     both more pleasant to use than plain Lex and the C source it
     produces is portable.  In order to ensure portability, however,
     you must either provide a function `yywrap' or, if you don't use
     it (e.g., your scanner has no `#include'-like feature), simply
     include a `%noyywrap' statement in the scanner's source.''
  
  This AC_PROG_LEX behaviour is causing some spurious failures of
  the Automake testsuite in environments which lack a proper library
  providing `yywrap' (this happens for example on Fedora-based
  systems).   The proper workaround is to simply provide a fall-back
  implementation of `yywrap' in our lexers.
  
  See also partially-overlapping commit `v1.11-871-geb147a1' (from
  the 'testsuite-work' branch), which was motivated by similar
  spurious failures experienced when cross-compiling.
  
  Reported by Jim Meyering:
  <http://lists.gnu.org/archive/html/automake-patches/2011-10/msg00092.html>
  
  * tests/cond35.test: Provide a dummy `yywrap' function.
  * tests/lex3.test: Likewise.
  * tests/lexvpath.test: Likewise.
  * tests/silent-lex-generic.test: Likewise.
  * tests/silent-lex-gcc.test: Likewise.
  

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• tests/silent-lex-gcc.test

• #!/bin/sh
  # Copyright (C) 2010, 2011 Free Software Foundation, Inc.
  #
  # This program is free software; you can redistribute it and/or modify
  # it under the terms of the GNU General Public License as published by
  # the Free Software Foundation; either version 2, or (at your option)
  # any later version.
  #
  # This program is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  # GNU General Public License for more details.
  #
  # You should have received a copy of the GNU General Public License
  # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  
  # Check silent-rules mode for Lex, forcing gcc depmode.
  # Keep this in sync with sister test `silent-lex-generic.test'.
  
  required='flex gcc'
  . ./defs || Exit 1
  
  mkdir sub
  
  cat >>configure.in <<'EOF'
  AM_SILENT_RULES
  AM_PROG_CC_C_O
  AC_PROG_LEX
  AC_CONFIG_FILES([sub/Makefile])
  AC_OUTPUT
  EOF
  
  cat > Makefile.am <<'EOF'
  # Need generic and non-generic rules.
  bin_PROGRAMS = foo1 foo2
  foo1_SOURCES = foo.l
  foo2_SOURCES = $(foo1_SOURCES)
  foo2_CFLAGS = $(AM_CFLAGS)
  SUBDIRS = sub
  LDADD = $(LEXLIB)
  EOF
  
  cat > sub/Makefile.am <<'EOF'
  AUTOMAKE_OPTIONS = subdir-objects
  # Need generic and non-generic rules.
  bin_PROGRAMS = bar1 bar2
  bar1_SOURCES = bar.l
  bar2_SOURCES = $(bar1_SOURCES)
  bar2_CFLAGS = $(AM_CFLAGS)
  LDADD = $(LEXLIB)
  EOF
  
  cat > foo.l <<'EOF'
  %%
  "END"   return EOF;
  .
  %%
  /* Avoid possible link errors. */
  int yywrap (void) { return 1; }
  int   main (void) { return 0; }
  EOF
  cp foo.l sub/bar.l
  
  $ACLOCAL
  $AUTOMAKE --add-missing
  $AUTOCONF
  
  # Force gcc ("fast") depmode.
  # This apparently useless "for" loop is here to simplify the syncing
  # with sister test `silent-lex-gcc.test'.
  for config_args in \
    am_cv_CC_dependencies_compiler_type=gcc
  do
    ./configure $config_args --enable-silent-rules
  
    $MAKE >stdout || { cat stdout; Exit 1; }
    cat stdout
  
    $EGREP ' (-c|-o)' stdout && Exit 1
    $EGREP '(mv|ylwrap) ' stdout && Exit 1
  
    grep 'LEX .*foo\.' stdout
    grep 'LEX .*bar\.' stdout
    grep ' CC .*foo\.' stdout
    grep ' CC .*bar\.' stdout
    grep 'CCLD .*foo1' stdout
    grep 'CCLD .*bar1' stdout
    grep 'CCLD .*foo2' stdout
    grep 'CCLD .*bar2' stdout
  
    # Cleaning and then rebuilding with the same V flag (and without
    # removing the generated sources in between) shouldn't trigger a
    # different set of rules.
    $MAKE clean
  
    $MAKE >stdout || { cat stdout; Exit 1; }
    cat stdout
  
    $EGREP ' (-c|-o)' stdout && Exit 1
    $EGREP '(mv|ylwrap) ' stdout && Exit 1
  
    # Don't look for LEX, as probably lex hasn't been re-run.
    grep ' CC .*foo\.' stdout
    grep ' CC .*bar\.' stdout
    grep 'CCLD .*foo1' stdout
    grep 'CCLD .*bar1' stdout
    grep 'CCLD .*foo2' stdout
    grep 'CCLD .*bar2' stdout
  
    # Ensure a truly clean rebuild.
    $MAKE clean
    rm -f foo.c sub/bar.c
  
    $MAKE V=1 >stdout || { cat stdout; Exit 1; }
    cat stdout
  
    grep ' -c ' stdout
    grep ' -o ' stdout
    grep 'ylwrap ' stdout
  
    $EGREP '(LEX|CC|CCLD) ' stdout && Exit 1
  
    # Cleaning and then rebuilding with the same V flag (and without
    # removing the generated sources in between) shouldn't trigger a
    # different set of rules.
    $MAKE clean
  
    $MAKE V=1 >stdout || { cat stdout; Exit 1; }
    cat stdout
  
    # Don't look for ylwrap, as probably lex hasn't been re-run.
    grep ' -c ' stdout
    grep ' -o ' stdout
  
    $EGREP '(LEX|CC|CCLD) ' stdout && Exit 1
  
    # Ensure a truly clean reconfiguration/rebuild.
    $MAKE clean
    $MAKE maintainer-clean
    rm -f foo.c sub/bar.c
  
  done
  
  :
  

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