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kc3-lang/libevent/whatsnew-2.2.txt
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Author :
stenn
Date : 2017-05-14 06:22:11
Hash : 1a448088
Message : Provide Makefile variables LIBEVENT_{CFLAGS,CPPFLAGS,LDFLAGS} This will allow a parent package to specify compiler, CPP, and linker flags to a libevent built as a sub-package. Document this in whatsnew-2.2.txt. Picked-from: #506 Closes: #506
- whatsnew-2.2.txt
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... * 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.