cmake-rs

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https://github.com/rust-lang/rust/blob/master/RELEASES.md#compiler-1

You can now use -C target-feature=+crt-static on linux-gnu targets. Note: If you're using cargo you must explicitly pass the --target flag.

But when I run

RUSTFLAGS="-C target-feature=+crt-static" cargo build --release --target x86_64-unknown-linux-gnu

my dep that uses cmake fails with:

error: failed to run custom build command for `ffts v0.1.0 (ssh://[email protected]/Boscop/ffts-rs#ef6850c8)`

Caused by:
  process didn't exit successfully: `/home/me/projects/myproject/target/release/build/ffts-a7bc83ba5c7e316e/build-script-build` (exit code: 101)
  --- stdout
  running: "cmake" "/home/me/.cargo/git/checkouts/ffts-rs-90217fe977f2ad3e/ef6850c/ffts" "-DCMAKE_INSTALL_PREFIX=/home/me/projects/myproject/target/x86_64-unknown-linux-gnu/release/build/ffts-63735e55463d2390/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64 -static" "-DCMAKE_C_COMPILER=/usr/bin/cc" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64 -static" "-DCMAKE_CXX_COMPILER=/usr/bin/c++" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64 -static" "-DCMAKE_ASM_COMPILER=/usr/bin/cc" "-DCMAKE_BUILD_TYPE=Release"
  -- The C compiler identification is GNU 10.2.0
  -- The ASM compiler identification is GNU
  -- Found assembler: /usr/bin/cc
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - done
  -- Check for working C compiler: /usr/bin/cc - skipped
  -- Detecting C compile features
  -- Detecting C compile features - done
  -- Looking for inttypes.h
  -- Looking for inttypes.h - found
  -- Looking for malloc.h
  -- Looking for malloc.h - found
  -- Looking for mm_malloc.h
  -- Looking for mm_malloc.h - found
  -- Looking for stdint.h
  -- Looking for stdint.h - found
  -- Looking for stdlib.h
  -- Looking for stdlib.h - found
  -- Looking for string.h
  -- Looking for string.h - found
  -- Looking for sys/mman.h
  -- Looking for sys/mman.h - found
  -- Looking for unistd.h
  -- Looking for unistd.h - found
  -- Looking for memalign
  -- Looking for memalign - found
  -- Looking for posix_memalign
  -- Looking for posix_memalign - found
  -- Looking for valloc
  -- Looking for valloc - found
  -- Looking for _mm_malloc
  -- Looking for _mm_malloc - not found
  -- Looking for memalign
  -- Looking for memalign - found
  -- Looking for posix_memalign
  -- Looking for posix_memalign - found
  -- Looking for valloc
  -- Looking for valloc - found
  -- Looking for _mm_malloc
  -- Looking for _mm_malloc - not found
  -- Looking for xmmintrin.h
  -- Looking for xmmintrin.h - found
  -- Looking for emmintrin.h
  -- Looking for emmintrin.h - found
  -- Looking for pmmintrin.h
  -- Looking for pmmintrin.h - found
  -- Performing Test HAVE_GCC_VISIBILITY
  -- Performing Test HAVE_GCC_VISIBILITY - Success
  -- Looking for pow in m
  -- Looking for pow in m - found
  -- Could NOT find OpenMP_C (missing: OpenMP_C_FLAGS OpenMP_C_LIB_NAMES) 
  -- Could NOT find OpenMP (missing: OpenMP_C_FOUND) 
  -- Found PkgConfig: /usr/bin/pkg-config (found version "1.7.3") 
  -- Configuring done
  -- Generating done
  -- Build files have been written to: /home/me/projects/myproject/target/x86_64-unknown-linux-gnu/release/build/ffts-63735e55463d2390/out/build
  running: "cmake" "--build" "." "--target" "install" "--config" "Release" "--"
  Scanning dependencies of target ffts_cpu_test
  [  5%] Building C object CMakeFiles/ffts_cpu_test.dir/src/ffts_cpu.c.o
  [ 11%] Building C object CMakeFiles/ffts_cpu_test.dir/tests/cpu_test.c.o
  [ 16%] Linking C executable ffts_cpu_test
  [ 16%] Built target ffts_cpu_test
  Scanning dependencies of target ffts_static
  [ 22%] Building C object CMakeFiles/ffts_static.dir/src/ffts.c.o
  [ 27%] Building C object CMakeFiles/ffts_static.dir/src/ffts_chirp_z.c.o
  [ 33%] Building C object CMakeFiles/ffts_static.dir/src/ffts_cpu.c.o
  [ 38%] Building C object CMakeFiles/ffts_static.dir/src/ffts_nd.c.o
  [ 44%] Building C object CMakeFiles/ffts_static.dir/src/ffts_real.c.o
  [ 50%] Building C object CMakeFiles/ffts_static.dir/src/ffts_real_nd.c.o
  [ 55%] Building C object CMakeFiles/ffts_static.dir/src/ffts_transpose.c.o
  [ 61%] Building C object CMakeFiles/ffts_static.dir/src/ffts_trig.c.o
  [ 66%] Building C object CMakeFiles/ffts_static.dir/src/ffts_static.c.o
  [ 72%] Building C object CMakeFiles/ffts_static.dir/src/codegen.c.o
  [ 77%] Linking C static library libffts.a
  [ 77%] Built target ffts_static
  Scanning dependencies of target ffts_test
  [ 83%] Building C object CMakeFiles/ffts_test.dir/tests/test.c.o
  [ 88%] Linking C executable ffts_test
  [ 88%] Built target ffts_test
  Scanning dependencies of target ffts_trig_test
  [ 94%] Building C object CMakeFiles/ffts_trig_test.dir/tests/trig_test.c.o
  [100%] Linking C executable ffts_trig_test

  --- stderr
  CMake Warning:
    Manually-specified variables were not used by the project:

      CMAKE_CXX_COMPILER
      CMAKE_CXX_FLAGS


  /home/me/.cargo/git/checkouts/ffts-rs-90217fe977f2ad3e/ef6850c/ffts/src/ffts.c: In function ‘ffts_init_1d_64f’:
  /home/me/.cargo/git/checkouts/ffts-rs-90217fe977f2ad3e/ef6850c/ffts/src/ffts.c:784:25: warning: unused parameter ‘N’ [-Wunused-parameter]
    784 | ffts_init_1d_64f(size_t N, int sign)
        |                  ~~~~~~~^
  /home/me/.cargo/git/checkouts/ffts-rs-90217fe977f2ad3e/ef6850c/ffts/src/ffts.c:784:32: warning: unused parameter ‘sign’ [-Wunused-parameter]
    784 | ffts_init_1d_64f(size_t N, int sign)
        |                            ~~~~^~~~
  /home/me/.cargo/git/checkouts/ffts-rs-90217fe977f2ad3e/ef6850c/ffts/src/ffts_static.c:240:36: warning: ‘ffts_constants_inv_64f’ defined but not used [-Wunused-const-variable=]
    240 | static const FFTS_ALIGN(16) double ffts_constants_inv_64f[16] = {
        |                                    ^~~~~~~~~~~~~~~~~~~~~~
  /home/me/.cargo/git/checkouts/ffts-rs-90217fe977f2ad3e/ef6850c/ffts/src/ffts_static.c:196:36: warning: ‘ffts_constants_64f’ defined but not used [-Wunused-const-variable=]
    196 | static const FFTS_ALIGN(16) double ffts_constants_64f[16] = {
        |                                    ^~~~~~~~~~~~~~~~~~
  /home/me/.cargo/git/checkouts/ffts-rs-90217fe977f2ad3e/ef6850c/ffts/src/ffts_static.c:142:36: warning: ‘ffts_constants_small_inv_64f’ defined but not used [-Wunused-const-variable=]
    142 | static const FFTS_ALIGN(16) double ffts_constants_small_inv_64f[24] = {
        |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /home/me/.cargo/git/checkouts/ffts-rs-90217fe977f2ad3e/ef6850c/ffts/src/ffts_static.c:78:36: warning: ‘ffts_constants_small_64f’ defined but not used [-Wunused-const-variable=]
     78 | static const FFTS_ALIGN(16) double ffts_constants_small_64f[24] = {
        |                                    ^~~~~~~~~~~~~~~~~~~~~~~~
  /home/me/.cargo/git/checkouts/ffts-rs-90217fe977f2ad3e/ef6850c/ffts/src/codegen.c: In function ‘ffts_generate_func_code’:
  /home/me/.cargo/git/checkouts/ffts-rs-90217fe977f2ad3e/ef6850c/ffts/src/codegen.c:282:19: warning: comparison of integer expressions of different signedness: ‘size_t’ {aka ‘long unsigned int’} and ‘int32_t’ {aka ‘int’} [-Wsign-compare]
    282 |         if (ws_is != pLUT) {
        |                   ^~
  /home/me/.cargo/git/checkouts/ffts-rs-90217fe977f2ad3e/ef6850c/ffts/src/codegen.c:121:15: warning: unused variable ‘len’ [-Wunused-variable]
    121 |     ptrdiff_t len;
        |               ^~~
  /usr/bin/ld: cannot find -lmpfr
  collect2: error: ld returned 1 exit status
  make[2]: *** [CMakeFiles/ffts_trig_test.dir/build.make:105: ffts_trig_test] Error 1
  make[1]: *** [CMakeFiles/Makefile2:155: CMakeFiles/ffts_trig_test.dir/all] Error 2
  make: *** [Makefile:149: all] Error 2
  thread 'main' panicked at '
  command did not execute successfully, got: exit code: 2

  build script failed, must exit now', /home/me/.cargo/registry/src/github.com-1ecc6299db9ec823/cmake-0.1.44/src/lib.rs:885:5
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
error: build failed

Any idea how I can make it work? :)

(Note that a normal cargo build --release works.)