Hi Andreas,

I spent some time on cross-compilation this morning.

My findings are that is that CMake is reporting that these functions are available:

-- Looking for setjmp.h -- Looking for setjmp.h - found

-- Looking for setjmp -- Looking for setjmp - found -- Looking for longjmp -- Looking for longjmp - found -- Looking for siglongjmp -- Looking for siglongjmp - found

-- Looking for setjmp -- Looking for setjmp - found

-- Looking for clock_gettime -- Looking for clock_gettime - found

But looking through the toolchain headers for the ARM cross compilation configuration, setjmp/longjmp are present but siglongjmp and clock_gettime are NOT available on the platform. This results in a number of compiler errors:

/Users/phillip/src/ea/course-code/src/002-cross-platform-build-system/cmake/011-tooling/buildresults/_deps/cmocka-src/src/cmocka.c:100:33: error: unknown type name 'sigjmp_buf' 100 | # define cm_jmp_buf sigjmp_buf | ^~~~~~~~~~ /Users/phillip/src/ea/course-code/src/002-cross-platform-build-system/cmake/011-tooling/buildresults/_deps/cmocka-src/src/cmocka.c:282:22: note: in expansion of macro 'cm_jmp_buf' 282 | static CMOCKA_THREAD cm_jmp_buf global_run_test_env; | ^~~~~~~~~~ /Users/phillip/src/ea/course-code/src/002-cross-platform-build-system/cmake/011-tooling/buildresults/_deps/cmocka-src/src/cmocka.c: In function 'exit_test': /Users/phillip/src/ea/course-code/src/002-cross-platform-build-system/cmake/011-tooling/buildresults/_deps/cmocka-src/src/cmocka.c:102:33: warning: implicit declaration of function 'siglongjmp'; did you mean 'longjmp'? [-Wimplicit-function-declaration] 102 | # define cm_longjmp(env, val) siglongjmp(env, val) | ^~~~~~~~~~ /Users/phillip/src/ea/course-code/src/002-cross-platform-build-system/cmake/011-tooling/buildresults/_deps/cmocka-src/src/cmocka.c:406:9: note: in expansion of macro 'cm_longjmp' 406 | cm_longjmp(global_run_test_env, 1); | ^~~~~~~~~~

When I updated the configuration checks to use check_symbol_exists for these items (used elsewhere in that file too), the checks properly noted that these functions weren't found, and compiling the static library for ARM succeeded.

check_symbol_exists(siglongjmp setjmp.h HAVE_SIGLONGJMP)

check_symbol_exists(clock_gettime time.h HAVE_CLOCK_GETTIME)

-- Looking for siglongjmp -- Looking for siglongjmp - not found

-- Looking for clock_gettime -- Looking for clock_gettime - not found

cmocka-build (master) $ ninja [4/4] Linking C static library src/libcmocka-static.a

I also re-ran this configuration change on OS X, and the functions were properly detected in this configuration:

-- Looking for siglongjmp -- Looking for siglongjmp - found

-- Looking for clock_gettime -- Looking for clock_gettime - found

Could you update the configuration check function?

Cheers, Phillip Johnston Principal, Firmware & Architecture Consulting https://embeddedartistryconsulting.com/ | Blog https://embeddedartistry.com/ | Newsletter https://embeddedartistry.com/newsletter

On Dec 16, 2021, at 03:25, Andreas Schneider asn@cryptomilk.org wrote:

On Thursday, December 16, 2021 9:37:27 AM CET Ryan McClue wrote:

...

Hello, I'm trying to cross compile with arm-none-eabi-gcc on an Ubuntu x64 build machine.

My CMake toolchain file contains the following flags:

mcpu=cortex-m4 -mthumb -mfloat-abi=soft -fdata-sections -ffunction-sections \ --specs=rdimon.specs -lgcc -lc -lm -lrdimon

This doesn't look like how a toolchain file should look like! Those are just CFLAGS.

https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html

Example: https://gitlab.com/cmocka/cmocka/-/blob/master/cmake/Toolchain-Debian-mips.c...

Best regards

Andreas

-- Andreas Schneider asn@cryptomilk.org GPG-ID: 8DFF53E18F2ABC8D8F3C92237EE0FC4DCC014E3D

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