float32(Inf) + friends gives codegen errors with nim cpp

[timotheecour]

Example

when true:
  proc main()=
    let a1 = [NaN, Inf]
    let a2 = float32(Inf)
    let a3 = [float32(NaN), float32(NaN)]
    # let a2 = [float32(NaN), float32(Inf)]
    # let b = (1.0'f32 / 0.0'f32, )

    let val = float32(Inf)
    let b = [val, val]

    const val2 = float32(Inf)
    let b2 = [val2, val2] # BUG with nim cpp
      # c: ok
      # cpp: bug:
      # error: non-constant-expression cannot be narrowed from type 'double' to 'NF32' (aka 'float') in initializer list [-Wc++11-narrowing]

    # let b3 = [float32(Inf), float32(Inf)] # ditto

    # let b4 = [float32(1.0'f32 / 0.0'f32)] # ditto
    # let b5 = (float32(1.0'f32 / 0.0'f32),) # ditto
  main()

Current Output

/@mt12274.nim.cpp:52:86: error: non-constant-expression cannot be narrowed from type 'double' to 'NF32' (aka 'float') in initializer list [-Wc++11-narrowing]
static NIM_CONST tyArray__4YxcnnI8do9a6vmNKtzdSKw TM__WkvCQIn9ahz9cNeh9cQ2UK5gA_4 = {INF,
                                                                                     ^~~
/Users/timothee/git_clone/nim/Nim_devel/lib/nimbase.h:506:17: note: expanded from macro 'INF'
#    define INF (1.0 / 0.0)
                ^~~~~~~~~~~
/Users/timothee/git_clone/nim/timn/build/nimcache/@mt12274.nim.cpp:52:86: note: insert an explicit cast to silence this issue
static NIM_CONST tyArray__4YxcnnI8do9a6vmNKtzdSKw TM__WkvCQIn9ahz9cNeh9cQ2UK5gA_4 = {INF,
                                                                                     ^~~
                                                                                     static_cast<NF32>( )
/Users/timothee/git_clone/nim/Nim_devel/lib/nimbase.h:506:17: note: expanded from macro 'INF'
#    define INF (1.0 / 0.0)
                ^~~~~~~~~~~
/Users/timothee/git_clone/nim/timn/build/nimcache/@mt12274.nim.cpp:53:1: error: non-constant-expression cannot be narrowed from type 'double' to 'NF32' (aka 'float') in initializer list [-Wc++11-narrowing]
INF}
^~~
/Users/timothee/git_clone/nim/Nim_devel/lib/nimbase.h:506:17: note: expanded from macro 'INF'
#    define INF (1.0 / 0.0)
                ^~~~~~~~~~~
/Users/timothee/git_clone/nim/timn/build/nimcache/@mt12274.nim.cpp:53:1: note: insert an explicit cast to silence this issue
INF}
^~~
static_cast<NF32>( )
/Users/timothee/git_clone/nim/Nim_devel/lib/nimbase.h:506:17: note: expanded from macro 'INF'
#    define INF (1.0 / 0.0)

Expected Output

works

Additional Information

1.5.1 97970d9

[ringabout]

I cannot reproduce the cpp codegen errors on windows.

when true:
  proc main()=
    let a1 = [NaN, Inf]
    let a2 = float32(Inf)
    let a3 = [float32(NaN), float32(NaN)]
    # let a2 = [float32(NaN), float32(Inf)]
    # let b = (1.0'f32 / 0.0'f32, )

    let val = float32(Inf)
    let b = [val, val]

    const val2 = float32(Inf)
    let b2 = [val2, val2] # BUG with nim cpp
      # c: ok
      # cpp: bug:
      # error: non-constant-expression cannot be narrowed from type 'double' to 'NF32' (aka 'float') in initializer list [-Wc++11-narrowing]

    let b3 = [float32(Inf), float32(Inf)] # ditto

    let b4 = [float32(1.0'f32 / 0.0'f32)] # ditto
    let b5 = (float32(1.0'f32 / 0.0'f32),) # ditto

    echo b2
    echo b3
    echo b4
    echo b5
  main()

with command nim cpp -r test.nim

[inf, inf]
[inf, inf]
[inf]
(inf,)

gcc info

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=D:/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/9.2.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../../../src/gcc-git-9.2.0/configure --build=x86_64-w64-mingw32 --enable-targets=all --enable-languages=ada,c,c++,fortran,lto,objc,obj-c++ --enable-libgomp --enable-lto --enable-graphite --enable-cxx-flags=-DWINPTHREAD_STATIC --disable-build-with-cxx --disable-build-poststage1-with-cxx --enable-libstdcxx-debug --enable-threads=posix --enable-version-specific-runtime-libs --enable-fully-dynamic-string --enable-libstdcxx-threads --enable-libstdcxx-time --with-gnu-ld --disable-werror --disable-nls --disable-win32-registry --enable-large-address-aware --disable-rpath --disable-symvers --prefix=/mingw64tdm --with-local-prefix=/mingw64tdm --with-pkgversion=tdm64-1 --with-bugurl=http://tdm-gcc.tdragon.net/bugs
Thread model: posix
gcc version 9.2.0 (tdm64-1)

Nim version

Nim Compiler Version 1.5.1 [Windows: amd64]
Compiled at 2021-06-02
Copyright (c) 2006-2021 by Andreas Rumpf

and Nim 1.4.6