Hi Torbjorn, I think there's additional context in: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103166 Le sam. 17 sept. 2022, 19:45, Torbjorn SVENSSON < torbjorn.svensson@foss.st.com> a écrit : > Hello, > > I've just tried to run the DejaGNU testsuite on GCC master > (9ac9fde961f76879f0379ff3b2494a2f9ac915f7) with a rather recent commit > of newlib (the package was patched by Arm and provided in their > 11.3.rel1 release). > Running the testsuite on arm-none-eabi produces a few hundred UNRESOLVED > test cases, all related to the absence of an implementation of getentropy. > > Looking at the current master of newlib > (eb5c631ead537ac5640d7e4b1ea0edbef344d6d9), there is still no > implementation, so I suspect that the same error would be visible if I > switched to the official newlib tree. > > In commit 3439657b02869299685d259c3a77aa38714565b7, the use of > getentropy was introduced in GCC and the changeset enables the use after > checking that the getentropy function is defined in unistd.h. In the > case of newlib, the definition exists in unistd.h, but there is no > common implementation for it. There are 2 specific implementations for > RTEMS and cygwin, but nothing common. > > > I suppose the origin of the problem is the definition of the getentropy > function in the newlib provided unistd.h, but what is the appropriate > fix for it? > - Create a stub function that just returns -1 and sets errno=ENOSYS? > - Remove the getentropy definition from common unistd.h and place it in > a fragment for cygwin and RTEMS? > - Any other solution that I've overlooked? > > > > Here is an example of how the error looks like for the GCC testsuite: > Testing g++.robertl/eb77.C, -std=c++20 > doing compile > Executing on host: /build/gcc-13-2709-g9ac9fde961f/bin/arm-none-eabi-g++ > /build/src/gcc/gcc/testsuite/g++.old-deja/g++.robertl/eb77.C -mthumb > -march=armv6s-m -mcpu=cortex-m0 -mfloat-abi=soft > -fdiagnostics-plain-output -fmessage-length=0 -std=c++20 > -pedantic-errors -Wno-long-long -Wl,--start-group -lc -lm > -Wl,--end-group --specs=nosys.specs -Wl,--allow-multiple-definition > -Wl,-u,_isatty,-u,_fstat -Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main > -Wl,-wrap,abort -Wl,g++_tg.o -lm -o ./eb77.exe (timeout = 800) > spawn -ignore SIGHUP > /build/gcc-13-2709-g9ac9fde961f/bin/arm-none-eabi-g++ > /build/src/gcc/gcc/testsuite/g++.old-deja/g++.robertl/eb77.C -mthumb > -march=armv6s-m -mcpu=cortex-m0 -mfloat-abi=soft > -fdiagnostics-plain-output -fmessage-length=0 -std=c++20 > -pedantic-errors -Wno-long-long -Wl,--start-group -lc -lm > -Wl,--end-group --specs=nosys.specs -Wl,--allow-multiple-definition > -Wl,-u,_isatty,-u,_fstat -Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main > -Wl,-wrap,abort -Wl,g++_tg.o -lm -o ./eb77.exe > pid is 28414 -28414 > /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: > > /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(random.o): > > in function `std::(anonymous namespace)::__libc_getentropy(void*)': > (.text._ZNSt12_GLOBAL__N_117__libc_getentropyEPv+0x8): undefined > reference to `getentropy' > /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: > > /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(random.o): > > in function > `std::random_device::_M_init(std::__cxx11::basic_string std::char_traits, std::allocator > const&)': > (.text._ZNSt13random_device7_M_initERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x58): > > undefined reference to `getentropy' > /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: > > /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libc.a(libc_a-arc4random.o): > > in function `_rs_stir': > (.text._rs_stir+0x8): undefined reference to `getentropy' > collect2: error: ld returned 1 exit status > pid is -1 > close result is 28414 exp6 0 1 > output is > /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: > > /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(random.o): > > in function `std::(anonymous namespace)::__libc_getentropy(void*)': > (.text._ZNSt12_GLOBAL__N_117__libc_getentropyEPv+0x8): undefined > reference to `getentropy' > /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: > > /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(random.o): > > in function > `std::random_device::_M_init(std::__cxx11::basic_string std::char_traits, std::allocator > const&)': > (.text._ZNSt13random_device7_M_initERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x58): > > undefined reference to `getentropy' > /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: > > /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libc.a(libc_a-arc4random.o): > > in function `_rs_stir': > (.text._rs_stir+0x8): undefined reference to `getentropy' > collect2: error: ld returned 1 exit status > status 1 > compiler exited with status 1 > FAIL: g++.old-deja/g++.robertl/eb77.C -std=c++20 (test for excess errors) > Excess errors: > (.text._ZNSt12_GLOBAL__N_117__libc_getentropyEPv+0x8): undefined > reference to `getentropy' > (.text._ZNSt13random_device7_M_initERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x58): > > undefined reference to `getentropy' > (.text._rs_stir+0x8): undefined reference to `getentropy' > UNRESOLVED: g++.old-deja/g++.robertl/eb77.C -std=c++20 compilation > failed to produce executable > > > Kind regards, > Torbjörn >