111 lines
3.2 KiB
Text
111 lines
3.2 KiB
Text
# flex.m4 serial 2
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# Copyright (C) 2012 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# AC_PROG_LEX
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# -----------
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# Look for flex or lex. Set its associated library to LEXLIB.
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# Check if lex declares yytext as a char * by default, not a char[].
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AN_MAKEVAR([LEX], [AC_PROG_LEX])
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AN_PROGRAM([lex], [AC_PROG_LEX])
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AN_PROGRAM([flex], [AC_PROG_LEX])
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AC_DEFUN_ONCE([AC_PROG_LEX],
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[AC_CHECK_PROGS([LEX], [flex lex], [:])
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if test "x$LEX" != "x:"; then
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_AC_PROG_LEX_YYTEXT_DECL
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fi])
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# _AC_PROG_LEX_YYTEXT_DECL
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# ------------------------
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# Check whether this is Flex, for the Lex output root, the Lex library,
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# and whether Lex declares yytext as a char * by default.
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m4_define([_AC_PROG_LEX_YYTEXT_DECL],
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[AC_CACHE_CHECK([whether lex is flex],
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[ac_cv_prog_lex_is_flex],
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[cat >conftest.l <<_ACEOF[
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%option debug nodefault noinput nounput noyywrap never-interactive
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%x SC_CONF_TEST
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%%
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a { BEGIN SC_CONF_TEST; }
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]_ACEOF
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if _AC_DO_VAR([LEX conftest.l]); then
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ac_cv_prog_lex_is_flex=yes
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else
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ac_cv_prog_lex_is_flex=no
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fi
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])
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AC_SUBST([LEX_IS_FLEX],
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[`test "$ac_cv_prog_lex_is_flex" = yes && echo true || echo false`])dnl
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cat >conftest.l <<_ACEOF[
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%%
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a { ECHO; }
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b { REJECT; }
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c { yymore (); }
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d { yyless (1); }
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e { /* IRIX 6.5 flex 2.5.4 underquotes its yyless argument. */
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yyless ((input () != 0)); }
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f { unput (yytext[0]); }
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. { BEGIN INITIAL; }
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%%
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#ifdef YYTEXT_POINTER
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extern char *yytext;
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#endif
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int
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main (void)
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{
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return ! yylex () + ! yywrap ();
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}
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]_ACEOF
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_AC_DO_VAR([LEX conftest.l])
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AC_CACHE_CHECK([lex output file root], [ac_cv_prog_lex_root], [
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if test -f lex.yy.c; then
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ac_cv_prog_lex_root=lex.yy
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elif test -f lexyy.c; then
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ac_cv_prog_lex_root=lexyy
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else
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AC_MSG_ERROR([cannot find output from $LEX; giving up])
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fi])
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AC_SUBST([LEX_OUTPUT_ROOT], [$ac_cv_prog_lex_root])dnl
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if test -z "${LEXLIB+set}"; then
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AC_CACHE_CHECK([lex library], [ac_cv_lib_lex], [
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ac_save_LIBS=$LIBS
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ac_cv_lib_lex='none needed'
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for ac_lib in '' -lfl -ll; do
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LIBS="$ac_lib $ac_save_LIBS"
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AC_LINK_IFELSE([AC_LANG_DEFINES_PROVIDED[`cat $LEX_OUTPUT_ROOT.c`]],
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[ac_cv_lib_lex=$ac_lib])
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test "$ac_cv_lib_lex" != 'none needed' && break
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done
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LIBS=$ac_save_LIBS
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])
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test "$ac_cv_lib_lex" != 'none needed' && LEXLIB=$ac_cv_lib_lex
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fi
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AC_SUBST([LEXLIB])
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AC_CACHE_CHECK([whether yytext is a pointer],
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[ac_cv_prog_lex_yytext_pointer],
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[# POSIX says lex can declare yytext either as a pointer or an array; the
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# default is implementation-dependent. Figure out which it is, since
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# not all implementations provide the %pointer and %array declarations.
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ac_cv_prog_lex_yytext_pointer=no
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ac_save_LIBS=$LIBS
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LIBS="$LEXLIB $ac_save_LIBS"
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AC_LINK_IFELSE([AC_LANG_DEFINES_PROVIDED
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[#define YYTEXT_POINTER 1
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`cat $LEX_OUTPUT_ROOT.c`]],
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[ac_cv_prog_lex_yytext_pointer=yes])
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LIBS=$ac_save_LIBS
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])
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dnl
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if test $ac_cv_prog_lex_yytext_pointer = yes; then
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AC_DEFINE([YYTEXT_POINTER], [1],
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[Define to 1 if `lex' declares `yytext' as a `char *' by default,
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not a `char[]'.])
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fi
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rm -f conftest.l $LEX_OUTPUT_ROOT.c
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])# _AC_PROG_LEX_YYTEXT_DECL
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