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73 lines
1.9 KiB
Plaintext
73 lines
1.9 KiB
Plaintext
# $Header: /cvsroot/pgsql/config/programs.m4,v 1.2 2000/10/26 16:28:00 petere Exp $
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# PGAC_PATH_FLEX
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# --------------
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# Look for Flex, set the output variable FLEX to its path if found.
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# Avoid the buggy version 2.5.3. Also find Flex if its installed
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# under `lex', but do not accept other Lex programs.
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AC_DEFUN([PGAC_PATH_FLEX],
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[AC_CACHE_CHECK([for flex], pgac_cv_path_flex,
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[# Let the user override the test
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if test -n "$FLEX"; then
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pgac_cv_path_flex=$FLEX
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else
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pgac_save_IFS=$IFS
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IFS=:
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for pgac_dir in $PATH; do
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if test -z "$pgac_dir" || test x"$pgac_dir" = x"."; then
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pgac_dir=`pwd`
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fi
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for pgac_prog in flex lex; do
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pgac_candidate="$pgac_dir/$pgac_prog"
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if test -f "$pgac_candidate" \
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&& $pgac_candidate --version </dev/null >/dev/null 2>&1
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then
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echo '%%' > conftest.l
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if $pgac_candidate -t conftest.l 2>/dev/null | grep FLEX_SCANNER >/dev/null 2>&1; then
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if $pgac_candidate --version | grep '2\.5\.3' >/dev/null 2>&1; then
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pgac_broken_flex=$pgac_candidate
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continue
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fi
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pgac_cv_path_flex=$pgac_candidate
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break 2
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fi
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fi
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done
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done
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IFS=$pgac_save_IFS
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rm -f conftest.l
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: ${pgac_cv_path_flex=no}
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fi
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])[]dnl AC_CACHE_CHECK
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if test x"$pgac_cv_path_flex" = x"no"; then
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if test -n "$pgac_broken_flex"; then
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AC_MSG_WARN([
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***
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The Flex version 2.5.3 you have at $pgac_broken_flex contains a bug. You
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should get version 2.5.4 or later.
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###])
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fi
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AC_MSG_WARN([
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***
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Without Flex you won't be able to build PostgreSQL from scratch, or change
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any of the scanner definition files. You can obtain Flex from a GNU mirror
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site. (If you are using the official distribution of PostgreSQL then you
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do not need to worry about this because the lexer files are pre-generated.)
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***])
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fi
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if test x"$pgac_cv_path_flex" = x"no"; then
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FLEX=
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else
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FLEX=$pgac_cv_path_flex
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fi
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AC_SUBST(FLEX)
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AC_SUBST(FLEXFLAGS)
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])# PGAC_PATH_FLEX
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