llvm-mirror/autoconf/m4/flex.m4
Reid Spencer f19a222b69 Individual autoconf function broken out of acincludes.m4. This change
per the recommended style guide for autoconf and so that individual
autoconf functions can more easily be shared across projects.

llvm-svn: 16223
2004-09-07 06:56:14 +00:00

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#
# Check for FLEX.
#
# This macro verifies that flex is installed. If successful, then
# 1) $LEX is set to "flex" (to emulate lex calls)
# 2) BISON is set to bison
AC_DEFUN([AC_PROG_FLEX],
[AC_CACHE_CHECK(,
ac_cv_has_flex,
[AC_PROG_LEX()
])
if test "$LEX" != "flex"; then
AC_MSG_ERROR([flex not found but required])
else
AC_SUBST(FLEX,[flex],[location of flex])
fi
])