[Target: Linux] call to undeclared function 'getentropy' (IDFGH-13480)

[darvik80]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

IDF version.

v5.3

Operating System used.

macOS

How did you build your project?

Command line with idf.py

If you are using Windows, please specify command line type.

None

What is the expected behavior?

build successfull

What is the actual behavior?

/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_hw_support/port/linux/esp_random.c:20:18: error: call to undeclared function 'getentropy'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
int result = getentropy(&random_number, sizeof(random_number));
^
/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_hw_support/port/linux/esp_random.c:37:18: error: call to undeclared function 'getentropy'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
result = getentropy(buf + chunk_num * GETENTROPY_MAX_LEN, GETENTROPY_MAX_LEN);
^
/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_hw_support/port/linux/esp_random.c:42:14: error: call to undeclared function 'getentropy'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
result = getentropy(buf + FULL_CHUNKS_NUM * GETENTROPY_MAX_LEN, REST_CHUNK_SIZE);

Steps to reproduce.

1. . $HOME/esp/esp-idf-v5.3/export.sh
2. idf.py create-project esp32-linux
3. cd esp32-linux
4. modify: CMakefile
   ...
   set(COMPONENTS main)
   ...
5. idf.py --preview set-target linux
6. idf.py build

Build or installation Logs.

Executing action: all (aliases: build)
Running ninja in directory /Users/ivan.kishchenko/projects/cpp/esp32-linux/build
Executing "ninja all"...
[0/1] Re-running CMake...CMake Warning (dev) at /Users/ivan.kishchenko/esp/esp-idf-v5.3/tools/cmake/build.cmake:137 (enable_language):
  project() should be called prior to this enable_language() call.
Call Stack (most recent call first):
  /Users/ivan.kishchenko/esp/esp-idf-v5.3/tools/cmake/build.cmake:214 (__build_set_lang_version)
  /Users/ivan.kishchenko/esp/esp-idf-v5.3/tools/cmake/idf.cmake:52 (__build_init)
  /Users/ivan.kishchenko/esp/esp-idf-v5.3/tools/cmake/project.cmake:29 (include)
  CMakeLists.txt:7 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.


-- git rev-parse returned 'fatal: not a git repository (or any of the parent directories): .git'
-- Could not use 'git describe' to determine PROJECT_VER.
-- Building ESP-IDF components for target linux
-- Project sdkconfig file /Users/ivan.kishchenko/projects/cpp/esp32-linux/sdkconfig
-- Components: esp_common esp_hw_support esp_rom esp_system freertos hal heap linux log main soc
-- Component paths: /Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_common /Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_hw_support /Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_rom /Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_system /Users/ivan.kishchenko/esp/esp-idf-v5.3/components/freertos /Users/ivan.kishchenko/esp/esp-idf-v5.3/components/hal /Users/ivan.kishchenko/esp/esp-idf-v5.3/components/heap /Users/ivan.kishchenko/esp/esp-idf-v5.3/components/linux /Users/ivan.kishchenko/esp/esp-idf-v5.3/components/log /Users/ivan.kishchenko/projects/cpp/esp32-linux/main /Users/ivan.kishchenko/esp/esp-idf-v5.3/components/soc
-- Configuring done (2.2s)
-- Generating done (0.0s)
-- Build files have been written to: /Users/ivan.kishchenko/projects/cpp/esp32-linux/build
[11/48] Building C object esp-idf/esp_hw_support/CMakeFiles/__idf_esp_hw_support.dir/port/linux/esp_random.c.o
FAILED: esp-idf/esp_hw_support/CMakeFiles/__idf_esp_hw_support.dir/port/linux/esp_random.c.o 
/Library/Developer/CommandLineTools/usr/bin/cc -DESP_PLATFORM -DIDF_VER=\"v5.3\" -DSOC_MMU_PAGE_SIZE=CONFIG_MMU_PAGE_SIZE -DSOC_XTAL_FREQ_MHZ=CONFIG_XTAL_FREQ -D_GLIBCXX_HAVE_POSIX_SEMAPHORE -D_GLIBCXX_USE_POSIX_SEMAPHORE -D_GNU_SOURCE -DprojCOVERAGE_TEST=0 -I/Users/ivan.kishchenko/projects/cpp/esp32-linux/build/config -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_hw_support/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/freertos/config/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/freertos/config/include/freertos -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/freertos/config/linux/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/freertos/FreeRTOS-Kernel/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/freertos/FreeRTOS-Kernel/portable/linux/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/freertos/FreeRTOS-Kernel/portable/linux/include/freertos -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/freertos/esp_additions/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/heap/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/log/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/soc/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/soc/linux -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/soc/linux/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/hal/platform_port/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/hal/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_rom/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_rom/include/linux -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_common/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_system/include -I/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/linux/include -arch arm64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX14.4.sdk -fcolor-diagnostics -ffunction-sections -fdata-sections -Wall -Werror=all -Wno-error=unused-function -Wno-error=unused-variable -Wno-error=unused-but-set-variable -Wno-error=deprecated-declarations -Wextra -Wno-unused-parameter -Wno-sign-compare -Wno-enum-conversion -gdwarf-4 -ggdb -Og -Wno-documentation -Wno-typedef-redefinition -Wno-char-subscripts -Wno-format-security -Wno-tautological-overlap-compare -Wno-tautological-pointer-compare -Wno-pointer-bool-conversion -Wno-string-concatenation -Wno-section -Wno-unknown-attributes -Wno-atomic-alignment -Wno-unused-but-set-variable -Wno-unused-function -Wno-gnu-variable-sized-type-not-at-end -Wno-constant-logical-operand -Wno-c2x-extensions -Wno-extern-c-compat -fmacro-prefix-map=/Users/ivan.kishchenko/projects/cpp/esp32-linux=. -fmacro-prefix-map=/Users/ivan.kishchenko/esp/esp-idf-v5.3=/IDF -fno-jump-tables -fno-use-cxa-atexit -std=gnu17 -MD -MT esp-idf/esp_hw_support/CMakeFiles/__idf_esp_hw_support.dir/port/linux/esp_random.c.o -MF esp-idf/esp_hw_support/CMakeFiles/__idf_esp_hw_support.dir/port/linux/esp_random.c.o.d -o esp-idf/esp_hw_support/CMakeFiles/__idf_esp_hw_support.dir/port/linux/esp_random.c.o -c /Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_hw_support/port/linux/esp_random.c
/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_hw_support/port/linux/esp_random.c:20:18: error: call to undeclared function 'getentropy'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    int result = getentropy(&random_number, sizeof(random_number));
                 ^
/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_hw_support/port/linux/esp_random.c:37:18: error: call to undeclared function 'getentropy'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
        result = getentropy(buf + chunk_num * GETENTROPY_MAX_LEN, GETENTROPY_MAX_LEN);
                 ^
/Users/ivan.kishchenko/esp/esp-idf-v5.3/components/esp_hw_support/port/linux/esp_random.c:42:14: error: call to undeclared function 'getentropy'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    result = getentropy(buf + FULL_CHUNKS_NUM * GETENTROPY_MAX_LEN, REST_CHUNK_SIZE);
             ^
3 errors generated.
[20/48] Building C object esp-idf/freertos/CMakeFiles/__idf_freertos.dir/FreeRTOS-Kernel/tasks.c.o
ninja: build stopped: subcommand failed.
ninja failed with exit code 1, output of the command is in the /Users/ivan.kishchenko/projects/cpp/esp32-linux/build/log/idf_py_stderr_output_94203 and /Users/ivan.kishchenko/projects/cpp/esp32-linux/build/log/idf_py_stdout_output_94203

More Information.

No response

[ESP-Marius]

Hey, which version of macos are you using?

I see that getentropy might be missing on some older version of macos

[darvik80]

Lastest version: 14.6.1 (23G93). I updated all that I can :)
In fact fix quite simple:
components/esp_hw_support/port/linux/esp_random.c
...
#include <sys/random.h>
...

[ESP-Marius]

Ah, we have actually already fixed this on master, but I missed the fact that you are on 5.3 and the fix hasnt been backported.

I'll make sure we do that.

[ESP-Marius]

Should be OK now. Closing this issue.