R version 4.6.0 alpha (2026-03-31 r89747 ucrt)
Copyright (C) 2026 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64

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> local({
+   
+   tmp_dir <- tempfile("hdf5lib_smoke_")
+   dir.create(tmp_dir)
+   file.copy("smoke_test.c", file.path(tmp_dir, "smoke_test.c"))
+   file.copy("Makevars",     file.path(tmp_dir, "Makevars"))
+   old_wd  <- setwd(tmp_dir)
+   so_file <- paste0("smoke_test", .Platform$dynlib.ext)
+   tmp_h5  <- tempfile(fileext = ".h5")
+   
+   old_r_tests <- Sys.getenv("R_TESTS")
+   Sys.setenv(R_TESTS = "")
+   
+   on.exit({
+     if (so_file %in% names(getLoadedDLLs())) {
+       dyn.unload(so_file)
+       gc()
+       Sys.sleep(0.2)
+     }
+     setwd(old_wd)
+     Sys.setenv(R_TESTS = old_r_tests)
+     try(silent = TRUE, unlink(tmp_dir, recursive = TRUE))
+   }, add = TRUE)
+   
+   # Compile `smoke_test.c`: system() returns 0 on success.
+   compile_cmd <- paste(shQuote(file.path(R.home("bin"), "R")), 'CMD SHLIB smoke_test.c')
+   exit_status <- system(compile_cmd)
+   
+   if (exit_status != 0)
+     stop("R CMD SHLIB failed to compile smoke_test.c")
+   
+   if (!file.exists(so_file))
+     stop(paste("Shared object missing at:", so_file))
+   
+   
+   # Load the shared object
+   dyn.load(so_file)
+   
+   # Call the C function (from smoke_test.c)
+   version_str <- .Call("C_smoke_test", tmp_h5)
+   
+   # Verify results
+   if (!inherits(version_str, "character"))
+     stop("version_str is not a character")
+   
+   if (!file.exists(tmp_h5))
+     stop("HDF5 file was not created by C code.")
+   
+   if (!grepl("^[0-9]+\\.[0-9]+\\.[0-9]+$", version_str))
+     stop(paste("version_str did not match the expected pattern. Got:", version_str))
+   
+ })
using C compiler: 'gcc.exe (GCC) 14.3.0'
make[1]: Entering directory '/d/temp/2026_04_01_06_55_16_3646/RtmpUhO2PB/hdf5lib_smoke_8a007fb07751'
gcc  -I"D:/RCompile/recent/R/include" -DNDEBUG `D:/RCompile/recent/R/bin/Rscript -e "cat(hdf5lib::c_flags(200))"`    -I"d:/rtools45/x86_64-w64-mingw32.static.posix/include"      -pedantic -Wstrict-prototypes -O2 -Wall -std=gnu2x  -mfpmath=sse -msse2 -mstackrealign   -c smoke_test.c -o smoke_test.o
gcc -shared -s -static-libgcc -o smoke_test.dll tmp.def smoke_test.o -LD:/RCompile/CRANincoming/R-devel/lib/hdf5lib/lib -lhdf5z -lpthread -lws2_32 -Ld:/rtools45/x86_64-w64-mingw32.static.posix/lib/x64 -Ld:/rtools45/x86_64-w64-mingw32.static.posix/lib -LD:/RCompile/recent/R/bin/x64 -lR
make[1]: Leaving directory '/d/temp/2026_04_01_06_55_16_3646/RtmpUhO2PB/hdf5lib_smoke_8a007fb07751'
make[1]: Entering directory '/d/temp/2026_04_01_06_55_16_3646/RtmpUhO2PB/hdf5lib_smoke_8a007fb07751'
make[1]: Leaving directory '/d/temp/2026_04_01_06_55_16_3646/RtmpUhO2PB/hdf5lib_smoke_8a007fb07751'
Running Strict HDF5 Plugin Smoke Tests...
  Testing zlibng_gzip     [OK]
  Testing szip_ec         [OK]
  Testing szip_nn         [OK]
  Testing bzip2           [OK]
  Testing lzf             [OK]
  Testing lz4             [OK]
  Testing lz4hc           [OK]
  Testing zstd            [OK]
  Testing snappy          [OK]
  Testing bshuf_pure      [OK]
  Testing bshuf_lz4       [OK]
  Testing bshuf_zstd      [OK]
  Testing zfp_rate        [OK]
  Testing zfp_prec        [OK]
  Testing zfp_acc         [OK]
  Testing zfp_expert      [OK]
  Testing zfp_rev         [OK]
  Testing blosc_lz        [OK]
  Testing blosc_lz4       [OK]
  Testing blosc_lz4hc     [OK]
  Testing blosc_snappy    [OK]
  Testing blosc_zlib      [OK]
  Testing blosc_zstd      [OK]
  Testing blosc2_lz       [OK]
  Testing blosc2_lz4      [OK]
  Testing blosc2_lz4hc    [OK]
  Testing blosc2_zlib     [OK]
  Testing blosc2_zstd     [OK]
  Testing blosc2_ndlz     [OK]
  Testing b2_zfp_acc      [OK]
  Testing b2_zfp_prec     [OK]
  Testing b2_zfp_rate     [OK]
  Testing blosc2_pipe     [OK]
> 
> proc.time()
   user  system elapsed 
   0.75    0.26    4.79