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f03fc94e7d
incarnations (I hope). When an acceptable flex version is not found, print instructive error messages from both configure and the makefiles, so that users can continue building anyway.
73 lines
1.9 KiB
Plaintext
73 lines
1.9 KiB
Plaintext
# $Header: /cvsroot/pgsql/config/programs.m4,v 1.1 2000/08/28 11:53:13 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 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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