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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
50 lines
1.8 KiB
Plaintext
50 lines
1.8 KiB
Plaintext
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* Building libevent as a sub-project using GNU Auto* tools
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Some projects will choose to include libevent in their source distribution,
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and build libevent as a sub-project. This may be effected by putting the
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line:
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AC_CONFIG_SUBDIRS([path/to/libevent])
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in the master configure.ac file for the master project.
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There are cases where the master project will want to pass in additional
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flags for CFLAGS, CPPFLAGS, or LDFLAGS. Since these variables are reserved
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for the user, and AM_CFLAGS, AM_CPPFLAGS, and AM_LDFLAGS are reserved for
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each package, libevent offers the following variables for a master package
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to tell libevent that there are additional compile/link values:
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LIBEVENT_CFLAGS
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LIBEVENT_CPPFLAGS
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LIBEVENT_LDFLAGS
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A master package can set these variables in its configure.ac file.
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Here's an example:
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configure.ac:
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...
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EXTRA_CFLAGS=...
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EXTRA_CPPFLAGS=...
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EXTRA_LDFLAGS=...
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...
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dnl ac_configure_args is undocumented but widely abused, as here,
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dnl to modify the defaults of the libevent subpackage, by prefixing
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dnl our changes to the child configure arguments already assembled.
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dnl User-supplied contradictory choices should prevail thanks to
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dnl "last wins".
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ac_configure_args=" --disable-openssl${ac_configure_args}"
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ac_configure_args=" --disable-shared${ac_configure_args}"
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ac_configure_args=" --disable-libevent-regress${ac_configure_args}"
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ac_configure_args=" --disable-libevent-install${ac_configure_args}"
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ac_configure_args=" --enable-silent-rules${ac_configure_args}"
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ac_configure_args=" --enable-function-sections${ac_configure_args}"
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ac_configure_args=" LIBEVENT_CFLAGS='${EXTRA_CFLAGS}'${ac_configure_args}"
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ac_configure_args=" LIBEVENT_CPPFLAGS='${EXTRA_CPPFLAGS}'${ac_configure_args}"
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ac_configure_args=" LIBEVENT_LDFLAGS='${EXTRA_LDFLAGS}'${ac_configure_args}"
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AC_CONFIG_SUBDIRS([libevent])
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The space after the initial '"' is significant. |