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8df0e40b46
FMT_VERSION is now living in fmt/core.h in libfmt >= 5.0, so we cannot
parse fmt/format.h for libfmt's version anymore. also we don't need
Findfmt.cmake now. because libfmt-dev 4.0 and up is required by seastar,
also it's libfmt-dev 3.x's cmake module which fails to offer fmt::fmt
target. in other words, it's safe to drop libfmt 3.x support. but 5.0.0
is not compatible with seastar, we will have failures like:
In file included from
/home/smithfarm/src/ceph/smithfarm/ceph/src/seastar/include/seastar/core/aligned_buffer.hh:25:0,
from
/home/smithfarm/src/ceph/smithfarm/ceph/src/seastar/include/seastar/core/reactor.hh:26,
from
/home/smithfarm/src/ceph/smithfarm/ceph/src/seastar/include/seastar/core/alien.hh:35,
from
/home/smithfarm/src/ceph/smithfarm/ceph/src/seastar/src/core/alien.cc:23:
/home/smithfarm/src/ceph/smithfarm/ceph/src/seastar/include/seastar/core/print.hh:
In function 'seastar::sstring seastar::format(const char*, A&& ...)':
/home/smithfarm/src/ceph/smithfarm/ceph/src/seastar/include/seastar/core/print.hh:135:10:
error: 'MemoryWriter' is not a member of 'fmt'
fmt::MemoryWriter out;
^~~~~~~~~~~~
/home/smithfarm/src/ceph/smithfarm/ceph/src/seastar/include/seastar/core/print.hh:136:5:
error: 'out' was not declared in this scope
out.write(fmt, std::forward<A>(a)...);
^~~
so, we should build libfmt even if we have libfmt-dev 5.x
Signed-off-by: Kefu Chai <kchai@redhat.com>
44 lines
1.4 KiB
CMake
44 lines
1.4 KiB
CMake
find_path(fmt_INCLUDE_DIR NAMES fmt/format.h)
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if(fmt_INCLUDE_DIR)
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set(_fmt_version_file "${fmt_INCLUDE_DIR}/fmt/format.h")
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if(NOT EXISTS "${_fmt_version_file}")
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set(_fmt_version_file "${fmt_INCLUDE_DIR}/fmt/core.h")
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endif()
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if(EXISTS "${_fmt_version_file}")
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# parse "#define FMT_VERSION 40100" to 4.1.0
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file(STRINGS "${fmt_INCLUDE_DIR}/fmt/format.h" fmt_VERSION_LINE
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REGEX "^#define[ \t]+FMT_VERSION[ \t]+[0-9]+$")
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string(REGEX REPLACE "^#define[ \t]+FMT_VERSION[ \t]+([0-9]+)$"
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"\\1" fmt_VERSION "${fmt_VERSION_LINE}")
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foreach(ver "fmt_VERSION_PATCH" "fmt_VERSION_MINOR" "fmt_VERSION_MAJOR")
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math(EXPR ${ver} "${fmt_VERSION} % 100")
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math(EXPR fmt_VERSION "(${fmt_VERSION} - ${${ver}}) / 100")
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endforeach()
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set(fmt_VERSION
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"${fmt_VERSION_MAJOR}.${fmt_VERSION_MINOR}.${fmt_VERSION_PATCH}")
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endif()
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endif()
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find_library(fmt_LIBRARY NAMES fmt)
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(fmt
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REQUIRED_VARS fmt_INCLUDE_DIR fmt_LIBRARY
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VERSION_VAR fmt_VERSION)
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mark_as_advanced(
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fmt_INCLUDE_DIR
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fmt_LIBRARY
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fmt_VERSION_MAJOR
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fmt_VERSION_MINOR
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fmt_VERSION_PATCH
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fmt_VERSION_STRING)
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if(fmt_FOUND AND NOT (TARGET fmt::fmt))
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add_library(fmt::fmt UNKNOWN IMPORTED)
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set_target_properties(fmt::fmt PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES "${fmt_INCLUDE_DIR}"
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IMPORTED_LINK_INTERFACE_LANGUAGES "CXX"
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IMPORTED_LOCATION "${fmt_LIBRARY}")
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endif()
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