CDT 12.3.0 for Eclipse 2025-12

CDT 12.3.0 for Eclipse 2025-12 is now released. Please have a look at the New and Noteworthy for the highlights of what is included in this release.

Eclipse IDE Installer

The preferred way to get CDT is to install Eclipse CDT as part of the Eclipse IDE for C/C++ Developers or Eclipse IDE for Embedded C/C++ Developers using the installer

Eclipse IDE Downloads

Alternatively, download the zip/tar/dmg files from the main Eclipse Downloads site.

p2 site

Install CDT into an existing installation using the following p2 URL: https://download.eclipse.org/tools/cdt/releases/12.3 or as a cdt-12.3.0.zip

Eclipse Marketplace

The CDT project maintains 3 Marketplace entries:

• The Complete Eclipse C/C++ IDE
• Eclipse C/C++ IDE
• Eclipse Terminal (including the CDT Serial connection)

Standalone Debugger

Any CDT install can be used as the standalone debugger, therefore download/install CDT as best suits you using the above options.

Thank you

Congratulations and thank you to everyone who contributed, whether by testing, filing bugs, submitting PRs, answering questions. Thank you all for the hard work.

What's Changed (Auto-generated by GitHub)

What's Changed

• Pin dependencies to released items for 2025-09 RC2 by @jonahgraham in #1292
• Revert "Pin dependencies to released items for 2025-09 RC2 (#1292)" by @jonahgraham in #1294
• Prepare repo for CDT 12.3.0 development by @jld01 in #1297
• p2 composites for CDT LSP 3.3 and CDT 12.2 by @jonahgraham in #1299
• [releng] Use platform 4.37 and CDT 12.2 release builds by @jld01 in #1303
• Ignore failing test testDesTest30_2_asm_only by @jld01 in #1304
• Gdb Manual Remote launch targets for CoreBuild projects by @ewaterlander in #1222
• Document the current steps for releasing CDT by @jonahgraham in #1190
• Document and cross ref migration of terminal to Eclipse Platform by @jonahgraham in #1308
• Delete the terminal test module that was migrated to platform by @laeubi in #1274
• Cleanup Gdb Remote launch targets. by @ewaterlander in #1310
• Add CDT 12.3 N&N page by @ewaterlander in #1317
• Delete org.eclipse.tm.terminal.view.ui from the repository by @laeubi in #1309
• remove org.eclipse.tm.terminal.view.core and references by @laeubi in #1324
• Fix flaky test CBuildConfigurationManagerTests.testNoConfigs by @ewaterlander in #1331
• Move the remote connector to the remote subfolder by @laeubi in #1325
• Workaround LLDB-MI =breakpoint-modified quirk by @jld01 in #1319
• [releng] Use final repos for API baseline by @jonahgraham in #1339
• Fix for the compiler path in compile_commands.json file by @alicetrifu in #1138
• Adopt special review process officially by @jonahgraham in #1347
• [#1300] prevent ArrayIndexOutOfBoundsException when options do not match by @ghentschke in #1301
• Fixes User Defined Toolchain clang type forgetfulness by @betamaxbandit in #1179
• Set CC and CXX environment variables for clang toolchain by @betamaxbandit in #1169
• Function resolution: prefer definition over declaration (#1263) by @davmac314 in #1264
• Templated default constructor should mask implicit constructor (#1265) by @davmac314 in #1266
• Improve template specialisation selection (#1267) by @davmac314 in #1268
• Allow general mixing of attributes and alignas (#1271) by @davmac314 in #1272
• Add C++ deduction guides to cmodel by @i-garrison in #1296
• Fix class member using declaration naming a constructor by @i-garrison in #1311
• Fix constexpr execution of if statement with static_assert declaration substatement by @i-garrison in #1312
• Add basic support for c++20 concepts and constraints by @i-garrison in #1313
• Allow NaryTypeId in template variable initializer by @i-garrison in #1320
• Add GCC builtin __is_assignable by @i-garrison in #1329
• Implement builtin has_trivial_destructor by @i-garrison in #1330
• Short circuit default initialization of array elements by @i-garrison in #1346
• PR for all open language PRs by @jonahgraham in #1356
• Remove Windows 98 Fallback and allow debugging without modify the source by @laeubi in #1146
• Remove WinPTY support by @laeubi in #1147
• Move connector.cdtserial and native.serial to new serial subfolder by @laeubi in #1337
• Fix broken references in CDT.setup's working sets by @merks in #1361
• Remove most org.eclipse.tm.terminal.* features by @jonahgraham in #1358
• Cleanup the terminal/ folder in CDT's source by @jonahgraham in #1360
• Add N&N entry for Instruction Stepping Mode Button visibility by @jonahgraham in #1357
• Accommodate LLDB-MI -var-show-attributes response by @jld01 in #1364
• Implement getCompositeEvaluation for fold expression by @i-garrison in #1365
• Add N&N for Set CC and CXX environment variables for clang toolchain by @betamaxbandit in #1368
• Changed directory field to reflect PWD. This is fixing #1371 by @alicetrifu in #1372
• Index distinct typedef in header file by @i-garrison in #1366
• Convert org.eclipse.cdt.core.parser.tests.ast2.SemanticTestBase to JUnit5 by @jonahgraham in #1378
• Improved MSVC detection fixes #929 by @azuo in #930
• Document workaround for JDT UI test discovery issue by @jonahgraham in #1381
• Improve triggering of license checks by @jonahgraham in #1388
• Resolve confusion about Makefile projects in wizards. by @ewaterlander in #1384
• Document LLDB debugger support enhancements by @jld01 in #1391
• Prepare the repo for 12.3.0 release by @jonahgraham in #1394

New Contributors

• @azuo made their first contribution in #930

Full Changelog: CDT_12_2_0...CDT_12_3_0