diff options
Diffstat (limited to 'whatsnew-2.2.txt')
| -rw-r--r-- | whatsnew-2.2.txt | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/whatsnew-2.2.txt b/whatsnew-2.2.txt index e69de29b..7e09e61f 100644 --- a/whatsnew-2.2.txt +++ b/whatsnew-2.2.txt @@ -0,0 +1,50 @@ +... + +* Building libevent as a sub-project using GNU Auto* tools + +Some projects will choose to include libevent in their source distribution, +and build libevent as a sub-project. This may be effected by putting the +line: + + AC_CONFIG_SUBDIRS([path/to/libevent]) + +in the master configure.ac file for the master project. + +There are cases where the master project will want to pass in additional +flags for CFLAGS, CPPFLAGS, or LDFLAGS. Since these variables are reserved +for the user, and AM_CFLAGS, AM_CPPFLAGS, and AM_LDFLAGS are reserved for +each package, libevent offers the following variables for a master package +to tell libevent that there are additional compile/link values: + + LIBEVENT_CFLAGS + LIBEVENT_CPPFLAGS + LIBEVENT_LDFLAGS + +A master package can set these variables in its configure.ac file. + +Here's an example: + +configure.ac: +... +EXTRA_CFLAGS=... +EXTRA_CPPFLAGS=... +EXTRA_LDFLAGS=... +... +dnl ac_configure_args is undocumented but widely abused, as here, +dnl to modify the defaults of the libevent subpackage, by prefixing +dnl our changes to the child configure arguments already assembled. +dnl User-supplied contradictory choices should prevail thanks to +dnl "last wins". +ac_configure_args=" --disable-openssl${ac_configure_args}" +ac_configure_args=" --disable-shared${ac_configure_args}" +ac_configure_args=" --disable-libevent-regress${ac_configure_args}" +ac_configure_args=" --disable-libevent-install${ac_configure_args}" +ac_configure_args=" --enable-silent-rules${ac_configure_args}" +ac_configure_args=" --enable-function-sections${ac_configure_args}" +ac_configure_args=" LIBEVENT_CFLAGS='${EXTRA_CFLAGS}'${ac_configure_args}" +ac_configure_args=" LIBEVENT_CPPFLAGS='${EXTRA_CPPFLAGS}'${ac_configure_args}" +ac_configure_args=" LIBEVENT_LDFLAGS='${EXTRA_LDFLAGS}'${ac_configure_args}" +AC_CONFIG_SUBDIRS([libevent]) +... + +The space after the initial '"' is significant.
\ No newline at end of file |