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feat(libc): pass __PICOLIBC_ERRNO_FUNCTION to picolibc builds

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This commit is contained in:
Alexey Lapshin
2026-07-29 15:11:37 +07:00
parent 6a9c44fe7e
commit 84f3d0bd96
4 changed files with 13 additions and 5 deletions
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4
components/esp_libc/hints.yml Normal file
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@@ -0,0 +1,4 @@
-
re: "errno: TLS reference in ([^ ]+\\.a)\\([^)]*\\) mismatches non-TLS definition"
hint: "The library '{}' accessed errno as a TLS symbol, which is incompatible with CONFIG_LIBC_NEWLIB=y (errno via __errno()). Contact the library maintainer to rebuild it with the latest ESP-IDF, or pass -D__PICOLIBC_ERRNO_FUNCTION=__errno if the library is built outside ESP-IDF. Alternatively keep CONFIG_LIBC_PICOLIBC=y, which still provides the TLS errno symbol for older prebuilts."
match_to_output: True

8
components/esp_libc/project_include.cmake
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@@ -58,6 +58,10 @@ if(CONFIG_IDF_TOOLCHAIN_GCC)
idf_toolchain_remove_flags(COMPILE_OPTIONS "-mdisable-hardware-atomics")
endif()
idf_toolchain_remove_flags(COMPILE_OPTIONS "-specs=.*picolibc.*")
idf_toolchain_remove_flags(COMPILE_OPTIONS "-D__STDC_WANT_LIB_EXT1__=0")
# TODO GCC-495:remove
idf_toolchain_remove_flags(COMPILE_OPTIONS "-D__PICOLIBC_ERRNO_FUNCTION=__errno")
if(CONFIG_LIBC_PICOLIBC)
# TODO GCC-464:
# The original picolibc.specs file cannot be used directly in the build
@@ -69,11 +73,11 @@ if(CONFIG_IDF_TOOLCHAIN_GCC)
# --gc-sections option.
get_picolibc_specs_path(picolibc_specs_path)
idf_toolchain_add_flags(COMPILE_OPTIONS "\"-specs=${picolibc_specs_path}\"")
# TODO GCC-495:remove
idf_toolchain_add_flags(COMPILE_OPTIONS "-D__PICOLIBC_ERRNO_FUNCTION=__errno")
if(LIBC_PICOLIBC_NEWLIB_COMPATIBILITY)
idf_toolchain_add_flags(COMPILE_OPTIONS "-D__STDC_WANT_LIB_EXT1__=0")
endif()
else()
idf_toolchain_remove_flags(COMPILE_OPTIONS "-specs=.*picolibc.*")
endif()
if(CONFIG_LIBC_NEWLIB_NANO_FORMAT)

5
components/esp_libc/src/picolibc/errno.c
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2025-2026 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@@ -12,11 +12,10 @@
* 'errno' is defined in the TDATA section. The linker script ensures that
* it is positioned at the beginning of the TDATA segment.
*/
#undef errno
__thread int errno __attribute__((section(".tdata.errno"))) = 0;
#if CONFIG_LIBC_PICOLIBC_NEWLIB_COMPATIBILITY
int *__errno(void)
{
return &errno;
}
#endif

1
components/esp_tee/subproject/main/common/syscall_stubs.c
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@@ -113,6 +113,7 @@ void IRAM_ATTR syscall_exit_tee(void)
* 'errno' is defined in the TDATA section. The linker script ensures that
* it is positioned at the beginning of the TDATA segment.
*/
#undef errno
__thread int errno __attribute__((section(".tdata.errno"))) = 0;
int *__errno(void)