coffee/fmt
1
0
Fork 0
mirror of https://github.com/fmtlib/fmt.git synced 2026-09-13 22:32:36 +08:00
Code Issues Packages Projects Releases Wiki Activity
fmt/.github/workflows/linux.yml
Avi Kivity e27cc20bd9
Format enums annotated with fmt::as_identifiers (requires C++26 reflection) (#4885) 
* Format enums annotated with fmt::as_identifiers (requires C++26 reflection)

Format an enum as the identifier of the matching enumerator if the enum is
annotated with fmt::as_identifiers:

  enum class [[=fmt::as_identifiers]] color { red, green, blue };
  fmt::format("{}", color::green);  // "green"

Values that don't match any enumerator are represented as their underlying
value in decimal before applying string formatting.

Identifiers are retrieved via C++26 reflection (P2996) and the annotation
via P3394. FMT_USE_REFLECTION is autodetected and can be overridden by the
user; without reflection the header is empty.

The header is also part of the fmt module, but, unlike with headers, whether
it provides anything is decided when the module is compiled, so the module
build detects reflection and enables it if the configured standard allows.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* Look up enum identifiers by index when the values are dense

The formatter for enums annotated with fmt::as_identifiers did a linear
search over all enumerators. Build a table indexed by the distance from
the smallest enumerator value instead, with empty string views in the
holes, which reduces the lookup to a bounds check and one load.

The table is only used if at least 70% of its elements are identifiers,
limiting its size to 10/7 of the number of enumerators. Sparser enums
keep using the linear search. Distances are computed in uint64_t so that
enums with negative values and values spanning the whole range of the
underlying type are handled without overflow.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* Suppress -Wsfinae-incomplete in format-test on GCC 16

GCC 16 warns when a type is completed after it failed to be complete in a
SFINAE context. format-test does this deliberately to check that formatting
of incomplete types works, so the warning is a false positive there and
breaks the build with -Werror.

* Test GCC 16 on CI

GCC 16 is the first compiler with C++26 reflection support, which is needed
by fmt/enum.h, so add a job that builds with it in C++26 mode. It comes from
the ubuntu-toolchain-r/test PPA since Ubuntu 24.04 only ships GCC 14.

Also report when reflection is not detected to make it visible that
enum-test was skipped.

---------

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-23 09:31:28 -07:00

227 lines
9.4 KiB
YAML
Raw Blame History

name: linux
on: [push, pull_request]
permissions:
contents: read
jobs:
build:
name: >-
${{matrix.cxx}} c++${{matrix.std}} ${{matrix.build_type}}
${{matrix.gen}} ${{matrix.fuzz && 'Fuzz' || ''}}
${{matrix.shared && 'Shared' || ''}}
${{matrix.cxxflags_extra && 'Sanitize' || ''}}
runs-on: ${{ matrix.os || 'ubuntu-22.04' }}
env:
# Run tests in a non-UTC timezone. glibc localtime/strftime honor TZ, so
# there is no need for timedatectl, which fails without systemd-timedated.
TZ: Europe/Kyiv
strategy:
matrix:
cxx: [g++-4.9, g++-11, clang++-3.6, clang++-11]
build_type: [Debug, Release]
std: [11]
shared: [""]
include:
- cxx: g++-4.9
- cxx: g++-11
build_type: Debug
std: 14
install: sudo apt install g++-11
- cxx: g++-11
build_type: Debug
std: 17
- cxx: g++-11
build_type: Debug
std: 20
install: sudo apt install g++-11
- cxx: g++-13
build_type: Release
std: 23
os: ubuntu-24.04
shared: -DBUILD_SHARED_LIBS=ON
- cxx: g++-14
build_type: Release
std: 23
os: ubuntu-24.04
gen: Ninja
- cxx: g++-16
build_type: Debug
std: 26
os: ubuntu-24.04
install: sudo apt install g++-16
- cxx: clang++-3.6
- cxx: clang++-11
build_type: Debug
std: 17
cxxflags: -stdlib=libc++
install: sudo apt install clang-11 libc++-11-dev libc++abi-11-dev
- cxx: clang++-11
install: sudo apt install clang-11
- cxx: clang++-11
build_type: Debug
fuzz: -DFMT_FUZZ=ON -DFMT_FUZZ_LINKMAIN=ON
std: 17
install: sudo apt install clang-11
- cxx: clang++-14
build_type: Debug
std: 20
cxxflags: -fsanitize=address
cxxflags_extra: -fno-sanitize-recover=all -fno-omit-frame-pointer
- cxx: clang++-14
build_type: Debug
std: 20
cxxflags: -stdlib=libc++
install: sudo apt install libc++-14-dev libc++abi-14-dev
- cxx: clang++-20
build_type: Debug
std: 20
cxxflags: -stdlib=libc++
install: sudo apt install clang-20 libc++-20-dev libc++abi-20-dev
gen: Ninja
steps:
- uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
- name: Install GCC 4.9
run: |
sudo apt update
sudo apt install libatomic1 libc6-dev libgomp1 libitm1 libmpc3
# https://launchpad.net/ubuntu/xenial/amd64/g++-4.9/4.9.3-13ubuntu2
# launchpad periodically returns 50x errors, so retry to avoid flaky CI.
wget --no-verbose --tries=5 --waitretry=10 \
--retry-connrefused --retry-on-http-error=502,503,504 \
http://launchpadlibrarian.net/230069137/libmpfr4_3.1.3-2_amd64.deb \
http://launchpadlibrarian.net/253728424/libasan1_4.9.3-13ubuntu2_amd64.deb \
http://launchpadlibrarian.net/445346135/libubsan0_5.4.0-6ubuntu1~16.04.12_amd64.deb \
http://launchpadlibrarian.net/445346112/libcilkrts5_5.4.0-6ubuntu1~16.04.12_amd64.deb \
http://launchpadlibrarian.net/253728426/libgcc-4.9-dev_4.9.3-13ubuntu2_amd64.deb \
http://launchpadlibrarian.net/253728432/libstdc++-4.9-dev_4.9.3-13ubuntu2_amd64.deb \
http://launchpadlibrarian.net/253728314/gcc-4.9-base_4.9.3-13ubuntu2_amd64.deb \
http://launchpadlibrarian.net/445345919/gcc-5-base_5.4.0-6ubuntu1~16.04.12_amd64.deb \
http://launchpadlibrarian.net/253728399/cpp-4.9_4.9.3-13ubuntu2_amd64.deb \
http://launchpadlibrarian.net/253728404/gcc-4.9_4.9.3-13ubuntu2_amd64.deb \
http://launchpadlibrarian.net/253728401/g++-4.9_4.9.3-13ubuntu2_amd64.deb
sudo dpkg -i \
libmpfr4_3.1.3-2_amd64.deb \
libasan1_4.9.3-13ubuntu2_amd64.deb \
libubsan0_5.4.0-6ubuntu1~16.04.12_amd64.deb \
libcilkrts5_5.4.0-6ubuntu1~16.04.12_amd64.deb \
libgcc-4.9-dev_4.9.3-13ubuntu2_amd64.deb \
libstdc++-4.9-dev_4.9.3-13ubuntu2_amd64.deb \
gcc-4.9-base_4.9.3-13ubuntu2_amd64.deb \
gcc-5-base_5.4.0-6ubuntu1~16.04.12_amd64.deb \
cpp-4.9_4.9.3-13ubuntu2_amd64.deb \
gcc-4.9_4.9.3-13ubuntu2_amd64.deb \
g++-4.9_4.9.3-13ubuntu2_amd64.deb
if: ${{ matrix.cxx == 'g++-4.9' }}
- name: Install Clang 3.6
run: |
sudo apt update
sudo apt install libtinfo5
# https://code.launchpad.net/ubuntu/xenial/amd64/clang-3.6/1:3.6.2-3ubuntu2
# launchpad periodically returns 50x errors, so retry to avoid flaky CI.
wget --no-verbose --tries=5 --waitretry=10 \
--retry-connrefused --retry-on-http-error=502,503,504 \
http://launchpadlibrarian.net/230019046/libffi6_3.2.1-4_amd64.deb \
http://launchpadlibrarian.net/445346109/libasan2_5.4.0-6ubuntu1~16.04.12_amd64.deb \
http://launchpadlibrarian.net/445346135/libubsan0_5.4.0-6ubuntu1~16.04.12_amd64.deb \
http://launchpadlibrarian.net/445346112/libcilkrts5_5.4.0-6ubuntu1~16.04.12_amd64.deb \
http://launchpadlibrarian.net/445346128/libmpx0_5.4.0-6ubuntu1~16.04.12_amd64.deb \
http://launchpadlibrarian.net/445346113/libgcc-5-dev_5.4.0-6ubuntu1~16.04.12_amd64.deb \
http://launchpadlibrarian.net/445346131/libstdc++-5-dev_5.4.0-6ubuntu1~16.04.12_amd64.deb \
http://launchpadlibrarian.net/445346022/libobjc-5-dev_5.4.0-6ubuntu1~16.04.12_amd64.deb \
http://launchpadlibrarian.net/254405108/libllvm3.6v5_3.6.2-3ubuntu2_amd64.deb \
http://launchpadlibrarian.net/254405097/libclang-common-3.6-dev_3.6.2-3ubuntu2_amd64.deb \
http://launchpadlibrarian.net/254405101/libclang1-3.6_3.6.2-3ubuntu2_amd64.deb \
http://launchpadlibrarian.net/445345919/gcc-5-base_5.4.0-6ubuntu1~16.04.12_amd64.deb \
http://launchpadlibrarian.net/254405091/clang-3.6_3.6.2-3ubuntu2_amd64.deb
sudo dpkg -i \
libffi6_3.2.1-4_amd64.deb \
libasan2_5.4.0-6ubuntu1~16.04.12_amd64.deb \
libubsan0_5.4.0-6ubuntu1~16.04.12_amd64.deb \
libcilkrts5_5.4.0-6ubuntu1~16.04.12_amd64.deb \
libmpx0_5.4.0-6ubuntu1~16.04.12_amd64.deb \
libgcc-5-dev_5.4.0-6ubuntu1~16.04.12_amd64.deb \
libstdc++-5-dev_5.4.0-6ubuntu1~16.04.12_amd64.deb \
libobjc-5-dev_5.4.0-6ubuntu1~16.04.12_amd64.deb \
libllvm3.6v5_3.6.2-3ubuntu2_amd64.deb \
libclang-common-3.6-dev_3.6.2-3ubuntu2_amd64.deb \
libclang1-3.6_3.6.2-3ubuntu2_amd64.deb \
gcc-5-base_5.4.0-6ubuntu1~16.04.12_amd64.deb \
clang-3.6_3.6.2-3ubuntu2_amd64.deb
if: ${{ matrix.cxx == 'clang++-3.6' }}
- name: Install LLVM-20
run: |
sudo install -D -m 0644 support/llvm-snapshot.gpg.key \
/etc/apt/keyrings/apt.llvm.org.asc
codename=$(lsb_release -cs)
echo "deb [signed-by=/etc/apt/keyrings/apt.llvm.org.asc]" \
"https://apt.llvm.org/$codename/" \
"llvm-toolchain-$codename-20 main" \
| sudo tee /etc/apt/sources.list.d/llvm.list
if: ${{ matrix.cxx == 'clang++-20' }}
- name: Install GCC 16
run: |
sudo add-apt-repository --no-update --yes ppa:ubuntu-toolchain-r/test
if: ${{ matrix.cxx == 'g++-16' }}
- name: Add Ubuntu mirrors
run: |
# GitHub Actions caching proxy is at times unreliable
# see https://github.com/actions/runner-images/issues/7048.
mirrors=/etc/apt/mirrors.txt
printf 'http://azure.archive.ubuntu.com/ubuntu\tpriority:1\n' | \
sudo tee $mirrors
curl http://mirrors.ubuntu.com/mirrors.txt | sudo tee --append $mirrors
sudo sed -i \
"s~http://azure.archive.ubuntu.com/ubuntu/~mirror+file:$mirrors~" \
/etc/apt/sources.list
- name: Create build environment
run: |
sudo apt update
${{matrix.install}}
sudo apt install locales-all
cmake -E make_directory ${{runner.workspace}}/build
- name: Select matching C compiler
run: |
cc=${{matrix.cxx}}
cc=${cc/clang++/clang}
cc=${cc/g++/gcc}
echo "CC=$cc" >> "$GITHUB_ENV"
- name: Configure
working-directory: ${{runner.workspace}}/build
env:
CXX: ${{matrix.cxx}}
CXXFLAGS: ${{matrix.cxxflags}} ${{matrix.cxxflags_extra}}
run: |
cmake ${{matrix.gen && '-G' || ''}} ${{matrix.gen}} \
-DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
-DCMAKE_CXX_STANDARD=${{matrix.std}} \
-DCMAKE_CXX_VISIBILITY_PRESET=hidden \
-DCMAKE_VISIBILITY_INLINES_HIDDEN=ON \
-DFMT_DOC=OFF -DFMT_PEDANTIC=ON \
-DFMT_WERROR=ON \
${{matrix.fuzz}} \
${{matrix.shared}} \
$GITHUB_WORKSPACE
- name: Build
working-directory: ${{runner.workspace}}/build
run: |
threads=`nproc`
cmake --build . --config ${{matrix.build_type}} --parallel $threads
- name: Test
working-directory: ${{runner.workspace}}/build
run: ctest -C ${{matrix.build_type}}
env:
CTEST_OUTPUT_ON_FAILURE: True
Reference in New Issue View Git Blame Copy Permalink