[libc][complex] Testing infra for MPC

[Sh0g0-1758]

This PR aims to add the groundwork to test the precision of libc complex functions against MPC. I took cargf as a test to verify that the infra works fine.

[github-actions]

✅ With the latest revision this PR passed the C/C++ code formatter.

[Sh0g0-1758]

@nickdesaulniers @lntue I have added a shared library with functions and classes that are needed both by MPCWrapper and MPFRWrapper. I earlier thought of simply exporting the definitions into MPFRWrapper.h but that would necessitate having mpfr_inc.h in the header file, which ofcourse would be highly undesirable. It was also leading to some nasty bugs during the full build and so decided to go with the shared library approach.

[Sh0g0-1758]

Okay, merging this now (its morning for me so will stay online for any angry bot)

[llvm-ci]

LLVM Buildbot has detected a new failure on builder libc-riscv32-qemu-yocto-fullbuild-dbg running on rv32gc-qemu-system while building libc at step 4 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/196/builds/4189

Here is the relevant piece of the build log for the reference

Step 4 (annotate) failure: 'python ../llvm-zorg/zorg/buildbot/builders/annotated/libc-linux.py ...' (failure)
...
[14/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.conjf.__internal__.dir/conjf.cpp.o
[15/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.conjf.dir/conjf.cpp.o
[16/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.crealf128.dir/crealf128.cpp.o
[17/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cproj.dir/cproj.cpp.o
[18/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.conjl.dir/conjl.cpp.o
[19/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.conj.dir/conj.cpp.o
[20/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cproj.__internal__.dir/cproj.cpp.o
[21/3882] Building CXX object libc/src/__support/CMakeFiles/libc.src.__support.freelist_heap.dir/freelist_heap.cpp.o
[22/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cimag.__internal__.dir/cimag.cpp.o
[23/3882] Building CXX object libc/utils/MPFRWrapper/CMakeFiles/libcMPCommon.dir/MPCommon.cpp.o
FAILED: libc/utils/MPFRWrapper/CMakeFiles/libcMPCommon.dir/MPCommon.cpp.o 
/usr/local/bin/clang++ -DLIBC_NAMESPACE=__llvm_libc_20_0_0_git -D_DEBUG -I/home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc -mabi=ilp32d -march=rv32imafdc --target=riscv32-unknown-linux-gnu --sysroot=/opt/riscv/sysroot --gcc-toolchain=/opt/riscv -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -std=gnu++17 -O3 --target=riscv32-unknown-linux-gnu -fpie -DLIBC_FULL_BUILD -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-rtti -ffixed-point -Wextra-semi -Wno-c99-extensions -Wno-gnu-imaginary-constant -Wno-pedantic -MD -MT libc/utils/MPFRWrapper/CMakeFiles/libcMPCommon.dir/MPCommon.cpp.o -MF libc/utils/MPFRWrapper/CMakeFiles/libcMPCommon.dir/MPCommon.cpp.o.d -o libc/utils/MPFRWrapper/CMakeFiles/libcMPCommon.dir/MPCommon.cpp.o -c /home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc/utils/MPFRWrapper/MPCommon.cpp
In file included from /home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc/utils/MPFRWrapper/MPCommon.cpp:9:
In file included from /home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc/utils/MPFRWrapper/MPCommon.h:20:
/home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc/utils/MPFRWrapper/mpfr_inc.h:20:10: fatal error: 'mpfr.h' file not found
   20 | #include <mpfr.h>
      |          ^~~~~~~~
1 error generated.
[24/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cimag.dir/cimag.cpp.o
[25/3882] Building CXX object libc/test/UnitTest/CMakeFiles/LibcTest.unit.dir/LibcTestMain.cpp.o
[26/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cprojl.dir/cprojl.cpp.o
[27/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cprojf128.dir/cprojf128.cpp.o
[28/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cimagf.dir/cimagf.cpp.o
[29/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cprojl.__internal__.dir/cprojl.cpp.o
[30/3882] Building CXX object libc/test/UnitTest/CMakeFiles/LibcMemoryHelpers.unit.dir/MemoryMatcher.cpp.o
[31/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cimagf.__internal__.dir/cimagf.cpp.o
[32/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cimagl.dir/cimagl.cpp.o
[33/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cimagl.__internal__.dir/cimagl.cpp.o
[34/3882] Building CXX object libc/test/UnitTest/CMakeFiles/LibcDeathTestExecutors.unit.dir/LibcDeathTestExecutors.cpp.o
[35/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cimagf128.__internal__.dir/cimagf128.cpp.o
[36/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cimagf128.dir/cimagf128.cpp.o
[37/3882] Building CXX object libc/src/complex/generic/CMakeFiles/libc.src.complex.generic.cprojf128.__internal__.dir/cprojf128.cpp.o
[38/3882] Building CXX object libc/utils/MPFRWrapper/CMakeFiles/libcMPFRWrapper.dir/MPFRUtils.cpp.o
FAILED: libc/utils/MPFRWrapper/CMakeFiles/libcMPFRWrapper.dir/MPFRUtils.cpp.o 
/usr/local/bin/clang++ -DLIBC_NAMESPACE=__llvm_libc_20_0_0_git -D_DEBUG -I/home/libcrv32buildbot/gmp+mpfr/include -I/home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc -mabi=ilp32d -march=rv32imafdc --target=riscv32-unknown-linux-gnu --sysroot=/opt/riscv/sysroot --gcc-toolchain=/opt/riscv -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -std=gnu++17 -O3 --target=riscv32-unknown-linux-gnu -fpie -DLIBC_FULL_BUILD -ffreestanding -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-rtti -ffixed-point -Wextra-semi -Wno-c99-extensions -Wno-gnu-imaginary-constant -Wno-pedantic -MD -MT libc/utils/MPFRWrapper/CMakeFiles/libcMPFRWrapper.dir/MPFRUtils.cpp.o -MF libc/utils/MPFRWrapper/CMakeFiles/libcMPFRWrapper.dir/MPFRUtils.cpp.o.d -o libc/utils/MPFRWrapper/CMakeFiles/libcMPFRWrapper.dir/MPFRUtils.cpp.o -c /home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc/utils/MPFRWrapper/MPFRUtils.cpp
In file included from /home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc/utils/MPFRWrapper/MPFRUtils.cpp:10:
In file included from /home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc/utils/MPFRWrapper/MPCommon.h:20:
In file included from /home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc/utils/MPFRWrapper/mpfr_inc.h:20:
In file included from /home/libcrv32buildbot/gmp+mpfr/include/mpfr.h:53:
In file included from /home/libcrv32buildbot/gmp+mpfr/include/gmp.h:23:
In file included from /home/libcrv32buildbot/gmp+mpfr/include/gmp-32.h:35:
In file included from /opt/riscv/lib/gcc/riscv32-unknown-linux-gnu/13.2.0/../../../../riscv32-unknown-linux-gnu/include/c++/13.2.0/iosfwd:38:
/opt/riscv/lib/gcc/riscv32-unknown-linux-gnu/13.2.0/../../../../riscv32-unknown-linux-gnu/include/c++/13.2.0/bits/requires_hosted.h:34:4: error: "This header is not available in freestanding mode."
   34 | #  error "This header is not available in freestanding mode."
      |    ^
In file included from /home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc/utils/MPFRWrapper/MPFRUtils.cpp:10:
In file included from /home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc/utils/MPFRWrapper/MPCommon.h:20:
In file included from /home/libcrv32buildbot/bbroot/libc-riscv32-qemu-yocto-fullbuild-dbg/llvm-project/libc/utils/MPFRWrapper/mpfr_inc.h:20:
In file included from /home/libcrv32buildbot/gmp+mpfr/include/mpfr.h:53:

[llvm-ci]

LLVM Buildbot has detected a new failure on builder openmp-offload-libc-amdgpu-runtime running on omp-vega20-1 while building libc at step 7 "Add check check-offload".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/73/builds/12545

Here is the relevant piece of the build log for the reference

Step 7 (Add check check-offload) failure: test (failure)
******************** TEST 'libomptarget :: amdgcn-amd-amdhsa :: mapping/data_member_ref.cpp' FAILED ********************
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 1
/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./bin/clang++ -fopenmp    -I /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test -I /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -L /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload -L /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./lib -L /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/openmp/runtime/src  -nogpulib -Wl,-rpath,/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload -Wl,-rpath,/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -Wl,-rpath,/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./lib  -fopenmp-targets=amdgcn-amd-amdhsa /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test/mapping/data_member_ref.cpp -o /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload/test/amdgcn-amd-amdhsa/mapping/Output/data_member_ref.cpp.tmp -Xoffload-linker -lc -Xoffload-linker -lm /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./lib/libomptarget.devicertl.a && /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload/test/amdgcn-amd-amdhsa/mapping/Output/data_member_ref.cpp.tmp | /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./bin/FileCheck /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test/mapping/data_member_ref.cpp
# executed command: /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./bin/clang++ -fopenmp -I /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test -I /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -L /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload -L /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./lib -L /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -nogpulib -Wl,-rpath,/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload -Wl,-rpath,/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/openmp/runtime/src -Wl,-rpath,/home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./lib -fopenmp-targets=amdgcn-amd-amdhsa /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test/mapping/data_member_ref.cpp -o /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload/test/amdgcn-amd-amdhsa/mapping/Output/data_member_ref.cpp.tmp -Xoffload-linker -lc -Xoffload-linker -lm /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./lib/libomptarget.devicertl.a
# executed command: /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/runtimes/runtimes-bins/offload/test/amdgcn-amd-amdhsa/mapping/Output/data_member_ref.cpp.tmp
# note: command had no output on stdout or stderr
# error: command failed with exit status: -11
# executed command: /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./bin/FileCheck /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test/mapping/data_member_ref.cpp
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.build/./bin/FileCheck /home/ompworker/bbot/openmp-offload-libc-amdgpu-runtime/llvm.src/offload/test/mapping/data_member_ref.cpp
# `-----------------------------
# error: command failed with exit status: 2

--

********************