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autoconf: Add comment on use of false.

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This is to avoid confusion as in commit
a0d29040f7.
This commit is contained in:
Niklas Hambüchen 2019-07-03 04:20:37 +02:00
parent c3db9e6f8f
commit cd8bc06e87
1 changed files with 9 additions and 3 deletions
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12
configure.ac
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@ -119,10 +119,12 @@ if test -z "$$1"; then
fi
])
# Note: Usage of `AC_PATH_PROG(..., ..., false)` indicates that this program
# is not required in all cases. (e.g. not when building from a release tarball).
# The use of `false` isn't ideal, because when used somewhere in the build it
# will silently fail without error message; this should be improved.
NEED_PROG(bash, bash)
NEED_PROG(patch, patch)
AC_PATH_PROG(xmllint, xmllint, false)
AC_PATH_PROG(xsltproc, xsltproc, false)
AC_PATH_PROG(flex, flex, false)
AC_PATH_PROG(bison, bison, false)
NEED_PROG(sed, sed)
@ -258,8 +260,12 @@ AC_ARG_ENABLE(doc-gen, AC_HELP_STRING([--disable-doc-gen],
doc_generate=$enableval, doc_generate=yes)
AC_SUBST(doc_generate)
# Check if docbook works without Internet (if not, likely packages providing the .xsl files are not installed)
if test "$doc_generate" = yes; then
# Programs required to build the manual
NEED_PROG(xmllint, xmllint)
NEED_PROG(xsltproc, xsltproc)
# Check if docbook works without Internet (if not, likely packages providing the .xsl files are not installed)
AC_MSG_CHECKING([if docbook can run without networking])
if "$xsltproc" --nonet --novalid http://docbook.sourceforge.net/release/xsl-ns/current/profiling/profile.xsl >&AS_MESSAGE_LOG_FD 2>&1; then
AC_MSG_RESULT(yes)