Jim Harris 79f9a7f572 build: generate pkg-config files for SPDK

Users can now generate the necessary linker args for their
own applications using something like:

PKG_CONFIG_PATH=build/lib/pkgconfig pkg-config --libs spdk_nvme

Dependencies between libraries are included in the generated
.pc files, so the user only needs to pass the top-level subsystems
or individual SPDK libraries they are using in their application.

Modules will automatically be added to the output if the associated
library is specified.  For example, specifying "spdk_bdev" will include
the libraries not only for spdk_bdev, but also all of the bdev modules.

Users still need to supply the -Wl,--no-as-needed or -Wl,--whole-archive
flags. They cannot be added to the .pc files without increasing the length
of the argument string by a factor of 15x to 20x.

Modify the test/external_code/hello_world Makefile to use pkg-config to
ensure this gets tested at some level in our autotest environment.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: Ie48a75f11969d5d775d514cf10bcb82d197eabfd
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/4371
Community-CI: Broadcom CI
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>

2021-01-21 09:46:32 +00:00

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@subpage system_configuration
@subpage libraries
@subpage pkgconfig
@subpage app_overview
@subpage iscsi
@subpage nvmf
@subpage vhost
@subpage bdev
@subpage blobfs
@subpage jsonrpc
@subpage jsonrpc_proxy

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User Guides

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