build(c): bump vendored fmt

This should fix a clang-18-only deprecation warning.

c/vendor/fmt/.gitignore

@@ -0,0 +1,24 @@
+*.a
+*.so*
+*.xcodeproj
+*~
+.vscode/
+/CMakeScripts
+/Testing
+/_CPack_Packages
+/doc/doxyxml
+/doc/html
+/doc/node_modules
+/install_manifest.txt
+CMakeCache.txt
+CMakeFiles
+CPack*.cmake
+CTestTestfile.cmake
+FMT.build
+Makefile
+bin/
+build/
+cmake_install.cmake
+fmt-*.cmake
+fmt.pc
+virtualenv

c/vendor/fmt/CMakeLists.txt

@@ -150,7 +150,7 @@ option(FMT_INSTALL "Generate the install target." ON)
 option(FMT_TEST "Generate the test target." ${FMT_MASTER_PROJECT})
 option(FMT_FUZZ "Generate the fuzz target." OFF)
 option(FMT_CUDA_TEST "Generate the cuda-test target." OFF)
-option(FMT_OS "Include core requiring OS (Windows/Posix) " ON)
+option(FMT_OS "Include OS-specific APIs." ON)
 option(FMT_MODULE "Build a module instead of a traditional library." OFF)
 option(FMT_SYSTEM_HEADERS "Expose headers with marking them as system." OFF)
 
@@ -167,18 +167,18 @@ if (CMAKE_SYSTEM_NAME STREQUAL "MSDOS")
   message(STATUS "MSDOS is incompatible with gtest")
 endif ()
 
-# Get version from core.h
-file(READ include/fmt/core.h core_h)
-if (NOT core_h MATCHES "FMT_VERSION ([0-9]+)([0-9][0-9])([0-9][0-9])")
-  message(FATAL_ERROR "Cannot get FMT_VERSION from core.h.")
+# Get version from base.h
+file(READ include/fmt/base.h base_h)
+if (NOT base_h MATCHES "FMT_VERSION ([0-9]+)([0-9][0-9])([0-9][0-9])")
+  message(FATAL_ERROR "Cannot get FMT_VERSION from base.h.")
 endif ()
 # Use math to skip leading zeros if any.
 math(EXPR CPACK_PACKAGE_VERSION_MAJOR ${CMAKE_MATCH_1})
 math(EXPR CPACK_PACKAGE_VERSION_MINOR ${CMAKE_MATCH_2})
 math(EXPR CPACK_PACKAGE_VERSION_PATCH ${CMAKE_MATCH_3})
 join(FMT_VERSION ${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}.
                  ${CPACK_PACKAGE_VERSION_PATCH})
-message(STATUS "Version: ${FMT_VERSION}")
+message(STATUS "{fmt} version: ${FMT_VERSION}")
 
 message(STATUS "Build type: ${CMAKE_BUILD_TYPE}")
 
@@ -274,13 +274,10 @@ function(add_headers VAR)
 endfunction()
 
 # Define the fmt library, its includes and the needed defines.
-add_headers(FMT_HEADERS args.h chrono.h color.h compile.h core.h format.h
+add_headers(FMT_HEADERS args.h base.h chrono.h color.h compile.h core.h format.h
                         format-inl.h os.h ostream.h printf.h ranges.h std.h
                         xchar.h)
 set(FMT_SOURCES src/format.cc)
-if (FMT_OS)
-  set(FMT_SOURCES ${FMT_SOURCES} src/os.cc)
-endif ()
 
 add_module_library(fmt src/fmt.cc FALLBACK
                    ${FMT_SOURCES} ${FMT_HEADERS} README.md ChangeLog.md
@@ -289,6 +286,11 @@ add_library(fmt::fmt ALIAS fmt)
 if (FMT_MODULE)
   enable_module(fmt)
 endif ()
+if (FMT_OS)
+  target_sources(fmt PRIVATE src/os.cc)
+else()
+  target_compile_definitions(fmt PRIVATE FMT_OS=0)
+endif ()
 
 if (FMT_WERROR)
   target_compile_options(fmt PRIVATE ${WERROR_FLAG})

c/vendor/fmt/ChangeLog.md

@@ -1,8 +1,3 @@
-# 10.2.1 - 2024-01-03
-
--   Fixed ABI compatibility with earlier 10.x versions
-    (https://github.com/fmtlib/fmt/pull/3786). Thanks @saraedum.
-
 # 10.2.0 - 2024-01-01
 
 -   Added support for the `%j` specifier (the number of days) for
@@ -2046,7 +2041,7 @@
     returned by `fmt::system_category()`
     (https://github.com/fmtlib/fmt/issues/2274,
     https://github.com/fmtlib/fmt/pull/2275). The latter is
-    similar to `std::sytem_category` but correctly handles UTF-8.
+    similar to `std::system_category` but correctly handles UTF-8.
     Thanks @phprus.
 
 -   Replaced `fmt::error_code` with `std::error_code` and made it

c/vendor/fmt/README.md

@@ -20,7 +20,7 @@ that help victims of the war in Ukraine: <https://www.stopputin.net/>.
 Q&A: ask questions on [StackOverflow with the tag
 fmt](https://stackoverflow.com/questions/tagged/fmt).
 
-Try {fmt} in [Compiler Explorer](https://godbolt.org/z/Eq5763).
+Try {fmt} in [Compiler Explorer](https://godbolt.org/z/8Mx1EW73v).
 
 # Features
 
@@ -203,43 +203,38 @@ and [ryu](https://github.com/ulfjack/ryu):
 
 ## Compile time and code bloat
 
-The script
-[bloat-test.py](https://github.com/fmtlib/format-benchmark/blob/master/bloat-test.py)
-from [format-benchmark](https://github.com/fmtlib/format-benchmark)
-tests compile time and code bloat for nontrivial projects. It generates
-100 translation units and uses `printf()` or its alternative five times
-in each to simulate a medium-sized project. The resulting executable
-size and compile time (Apple LLVM version 8.1.0 (clang-802.0.42), macOS
-Sierra, best of three) is shown in the following tables.
+The script [bloat-test.py][test] from [format-benchmark][bench] tests compile
+time and code bloat for nontrivial projects. It generates 100 translation units
+and uses `printf()` or its alternative five times in each to simulate a
+medium-sized project. The resulting executable size and compile time (Apple
+clang version 15.0.0 (clang-1500.1.0.2.5), macOS Sonoma, best of three) is shown
+in the following tables.
+
+[test]: https://github.com/fmtlib/format-benchmark/blob/master/bloat-test.py
+[bench]: https://github.com/fmtlib/format-benchmark
 
 **Optimized build (-O3)**
 
 | Method        | Compile Time, s | Executable size, KiB | Stripped size, KiB |
 |---------------|-----------------|----------------------|--------------------|
-| printf        |   2.6           |   29                 |   26               |
-| printf+string |   16.4          |   29                 |   26               |
-| iostreams     |   31.1          |   59                 |   55               |
-| {fmt}         |   19.0          |   37                 |   34               |
-| Boost Format  |   91.9          |   226                |   203              |
-| Folly Format  |   115.7         |   101                |   88               |
-
-As you can see, {fmt} has 60% less overhead in terms of resulting binary
-code size compared to iostreams and comes pretty close to `printf`.
-Boost Format and Folly Format have the largest overheads.
+| printf        |             1.6 |                   54 |                 50 |
+| IOStreams     |            25.9 |                   98 |                 84 |
+| fmt 83652df   |             4.8 |                   54 |                 50 |
+| tinyformat    |            29.1 |                  161 |                136 |
+| Boost Format  |            55.0 |                  530 |                317 |
 
-`printf+string` is the same as `printf` but with an extra `<string>`
-include to measure the overhead of the latter.
+{fmt} is fast to compile and is comparable to `printf` in terms of per-call
+binary size (within a rounding error on this system).
 
 **Non-optimized build**
 
 | Method        | Compile Time, s | Executable size, KiB | Stripped size, KiB |
 |---------------|-----------------|----------------------|--------------------|
-| printf        |   2.2           |   33                 |   30               |
-| printf+string |   16.0          |   33                 |   30               |
-| iostreams     |   28.3          |   56                 |   52               |
-| {fmt}         |   18.2          |   59                 |   50               |
-| Boost Format  |   54.1          |   365                |   303              |
-| Folly Format  |   79.9          |   445                |   430              |
+| printf        |             1.4 |                   54 |                 50 |
+| IOStreams     |            23.4 |                   92 |                 68 |
+| {fmt} 83652df |             4.4 |                   89 |                 85 |
+| tinyformat    |            24.5 |                  204 |                161 |
+| Boost Format  |            36.4 |                  831 |                462 |
 
 `libc`, `lib(std)c++`, and `libfmt` are all linked as shared libraries
 to compare formatting function overhead only. Boost Format is a
@@ -343,7 +338,7 @@ converts to `std::print`.)
 - [Quill](https://github.com/odygrd/quill): asynchronous low-latency
   logging library
 - [QKW](https://github.com/ravijanjam/qkw): generalizing aliasing to
-  simplify navigation, and executing complex multi-line terminal
+  simplify navigation, and execute complex multi-line terminal
   command sequences
 - [redis-cerberus](https://github.com/HunanTV/redis-cerberus): a Redis
   cluster proxy
@@ -432,7 +427,7 @@ code bloat issues (see [Benchmarks](#benchmarks)).
 
 ## FastFormat
 
-This is an interesting library that is fast, safe, and has positional
+This is an interesting library that is fast, safe and has positional
 arguments. However, it has significant limitations, citing its author:
 
 > Three features that have no hope of being accommodated within the
@@ -442,8 +437,8 @@ arguments. However, it has significant limitations, citing its author:
 > - Octal/hexadecimal encoding
 > - Runtime width/alignment specification
 
-It is also quite big and has a heavy dependency, STLSoft, which might be
-too restrictive for using it in some projects.
+It is also quite big and has a heavy dependency, on STLSoft, which might be
+too restrictive for use in some projects.
 
 ## Boost Spirit.Karma
 
@@ -486,5 +481,5 @@ To report a security issue, please disclose it at [security
 advisory](https://github.com/fmtlib/fmt/security/advisories/new).
 
 This project is maintained by a team of volunteers on a
-reasonable-effort basis. As such, please give us at least 90 days to
+reasonable-effort basis. As such, please give us at least *90* days to
 work on a fix before public exposure.

c/vendor/fmt/include/fmt/args.h

@@ -12,7 +12,7 @@
 #include <memory>      // std::unique_ptr
 #include <vector>
 
-#include "core.h"
+#include "format.h"  // std_string_view
 
 FMT_BEGIN_NAMESPACE