user/sven/glibc.git/Makerules, branch master

configure: Repurpose have-cc-with-libunwind for clang support

2026-03-12T16:52:50Z

The `have-cc-with-libunwind` check (and its corresponding macro HAVE_CC_WITH_LIBUNWIND) was historically specific to IA64, intended to supplement libgcc with libunwind. Since this logic is unused in current GCC configurations, this patch repurposes it to support clang-based toolchains that utilize LLVM's libunwind instead of libgcc_s. The configure script now detects if the compiler natively supports unwinding via `-lunwind`. Additionally, when this mode is enabled, `-lclang_rt.builtins` is explicitly added to the `libgcc_eh` definition. This is necessary because `links-dso-program` otherwise fails to link due to a missing `__gcc_personality_v0` symbol. It appears that clang does not automatically link the builtins providing this personality routine when `rlink-path` is actively used during the build. Reviewed-by: Sam James

Update copyright dates with scripts/update-copyrights

2026-01-01T21:42:29Z

Check if linker supports -Wl,--undefined-version

2025-11-20T17:33:13Z

Although binutils has supported --no-undefined-version for a long timei (319416359200 back in 2002), --undefined-version was only added more recently (27fb6a1a7fcd on 2.40). Reviewed-by: Sam James

Enable --no-undefined-version by default

2025-10-29T15:54:06Z

Recent lld version default to --no-undefined-version, which triggers errors when building multiple libraries. For ld.so on x86_64 it fails with: ld.lld: error: version script assignment of 'GLIBC_2.4' to symbol '__stack_chk_guard' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_PRIVATE' to symbol '__nptl_set_robust_list_avail' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_PRIVATE' to symbol '__pointer_chk_guard' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_PRIVATE' to symbol '_dl_starting_up' failed: symbol not defined While for libc.so: ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_clearerr' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_fgetc' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_fileno' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_freopen' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_fscanf' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_fseek' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_peekc_unlocked' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_stderr_' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_stdin_' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_stdout_' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_pclose' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_perror' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_rewind' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_scanf' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_setbuf' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_setlinebuf' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_wdefault_setbuf' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '_IO_wfile_setbuf' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '__ctype32_tolower' failed: symbol not defined ld.lld: error: version script assignment of 'GLIBC_2.17' to symbol '__ctype32_toupper' failed: symbol not defined ld.lld: error: too many errors emitted, stopping now (use --error-limit=0 to see all errors) The version script is created with multiple missing symbols to simplify the build for multiple ABIs, each of which may have different symbols. For instance, __stack_chk_guard is defined by default. This avoids requiring each ABI to add this symbol to its version script, depending on the stack protector ABI it uses. The libc.so warnings do show unused symbols being defined (like _IO_clearerr), which might trigger potential errors depending on how symbols are exported. However, since we already have ABI checks for missing and extra symbols, the linker's extra checks are not really necessary. The --no-undefined-version is the default for ld.bfd. Reviewed-by: H.J. Lu

Makerules: Use 'original' instead of 'master' in source.

2025-05-21T16:48:04Z

Use more inclusive language in makefile source. Reviewed-by: Florian Weimer

stdio-common: Add tests for formatted scanf input specifiers

2025-03-25T09:40:20Z

Add a collection of tests for formatted scanf input specifiers covering the b, d, i, o, u, x, and X integer conversions, the a, A, e, E, f, F, g, and G floating-point conversions, and the [, c, and s character conversions. Also the hh, h, l, and ll length modifiers are covered with the integer conversions as are the l and L length modifier with the floating-point conversions. The tests cover assignment suppressing and the field width as well, verifying the number of assignments made, the number of characters consumed and the value assigned. Add the common test code here as well as test cases for scanf, and then base Makefile infrastructure plus target-agnostic input data, for the character conversions and the `char', `short', and `long long' integer ones, signed and unsigned, with remaining input data and other functions from the scanf family deferred to subsequent additions. Keep input data disabled and referring to BZ #12701 for entries that are currently incorrectly accepted as valid data, such as '0b' or '0x' with the relevant integer conversions or sequences of an insufficient number of characters with the c conversion. Reviewed-by: Joseph Myers

Makeconfig: Support $(+nolink-deps) in link flags

2025-03-21T20:40:28Z

This allows adding dependencies to rules, but not linking against them. This is more or less a reimplementation of .EXTRA_PREREQS feature from GNU make 4.3. Reviewed-by: Adhemerval Zanella

Update copyright dates with scripts/update-copyrights

2025-01-01T19:22:09Z

Add a reference to Clang /usr/include/tgmath.h dependency

2024-12-22T22:28:55Z

The fake Clang /usr/include/tgmath.h dependency bug is: https://github.com/llvm/llvm-project/issues/120891 Signed-off-by: H.J. Lu Reviewed-by: Sam James

Remove Clang /usr/include/tgmath.h dependency

2024-12-22T04:50:53Z

Remove the /usr/include/tgmath.h dependency generated by Clang even though Clang never reads /usr/include/tgmath.h. Signed-off-by: H.J. Lu Reviewed-by: Sam James