Hi, Sergey!

thanks for the patch!

LGTM after fix a comment below

On 09.12.2024 13:16, Sergey Kaplun wrote:
> The `strtod parsing` subtest in the <lib/base/tonumber_scan.lua> checks
> the results yielded by the `strtod()` via FFI call. In GLibc versions
> before 2.19 it returns an incorrect result for "0x1p-2075" [1]. This
> patch skips this test for a smaller version of the libc installed.
>
> [1]:https://sourceware.org/bugzilla/show_bug.cgi?id=16151
> ---
>   test/CMakeLists.txt                          |  1 +
>   test/LuaJIT-tests/CMakeLists.txt             |  9 +++++
>   test/LuaJIT-tests/lib/base/tonumber_scan.lua |  4 +-
>   test/cmake/GetLibCVersion.cmake              | 41 ++++++++++++++++++++
>   4 files changed, 54 insertions(+), 1 deletion(-)
>   create mode 100644 test/cmake/GetLibCVersion.cmake
>
> diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
> index 0db2dd8b..be02d2e4 100644
> --- a/test/CMakeLists.txt
> +++ b/test/CMakeLists.txt
> @@ -73,6 +73,7 @@ separate_arguments(LUAJIT_TEST_COMMAND)
>   
>   set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
>   include(AddTestLib)
> +include(GetLibCVersion)
>   include(LibRealPath)
>   
>   # CTEST_FLAGS is used by CMake targets in test suites.
> diff --git a/test/LuaJIT-tests/CMakeLists.txt b/test/LuaJIT-tests/CMakeLists.txt
> index 019762e0..d0771e14 100644
> --- a/test/LuaJIT-tests/CMakeLists.txt
> +++ b/test/LuaJIT-tests/CMakeLists.txt
> @@ -62,6 +62,15 @@ if(CMAKE_C_FLAGS MATCHES "-march=skylake-avx512")
>     list(APPEND LUAJIT_TEST_TAGS_EXTRA +avx512)
>   endif()
>   
> +if(NOT CMAKE_SYSTEM_NAME STREQUAL "Darwin")
> +  GetLibCVersion(LIBC_VERSION)
> +  # XXX: <tonumber_scan.lua> uses `strtod()`, old versions of
> +  # which have the bug [1] for "0x1p-2075" parsing. Add the skip
> +  # check for it.
> +  # [1]:https://sourceware.org/bugzilla/show_bug.cgi?id=16151
> +  list(APPEND LUAJIT_TEST_TAGS_EXTRA +libc=${LIBC_VERSION})
> +endif()
> +
>   set(TEST_SUITE_NAME "LuaJIT-tests")
>   
>   # XXX: The call produces both test and target <LuaJIT-tests-deps>
> diff --git a/test/LuaJIT-tests/lib/base/tonumber_scan.lua b/test/LuaJIT-tests/lib/base/tonumber_scan.lua
> index e2dcd4d0..ac7d68a4 100644
> --- a/test/LuaJIT-tests/lib/base/tonumber_scan.lua
> +++ b/test/LuaJIT-tests/lib/base/tonumber_scan.lua
> @@ -186,7 +186,9 @@ do --- tonumber parsing
>     test_conv(tonumber)
>   end
>   
> -do --- strtod parsing
> +-- Skip for the old libc version with the bug in the `strtod()`.
> +-- See alsohttps://sourceware.org/bugzilla/show_bug.cgi?id=16151.
> +do --- strtod parsing -libc<2.19
>     test_conv(function(s)
>       local d = ffi.C.strtod(s, e)
>       return (e[0][0] == 0 and #s ~= 0) and d or nil
> diff --git a/test/cmake/GetLibCVersion.cmake b/test/cmake/GetLibCVersion.cmake
> new file mode 100644
> index 00000000..d87e8b70
> --- /dev/null
> +++ b/test/cmake/GetLibCVersion.cmake
> @@ -0,0 +1,41 @@
> +# Get the libc version installed in the system.
> +macro(GetLibCVersion output)
> +  # Try to directly parse the version.
> +  execute_process(
> +    COMMAND echo "#include <gnu/libc-version.h>"

I propose to replace "echo" with a variable set by `find_program()`:


diff --git a/test/cmake/GetLibCVersion.cmake 
b/test/cmake/GetLibCVersion.cmake
index d87e8b70..15a8b440 100644
--- a/test/cmake/GetLibCVersion.cmake
+++ b/test/cmake/GetLibCVersion.cmake
@@ -1,8 +1,14 @@
  # Get the libc version installed in the system.
  macro(GetLibCVersion output)
+  find_program(ECHO echo)
+  if(NOT ECHO)
+    message(FATAL_ERROR "`echo` is not found'")
+    return()
+  endif()
+
    # Try to directly parse the version.
    execute_process(
-    COMMAND echo "#include <gnu/libc-version.h>"
+    COMMAND ${ECHO} "#include <gnu/libc-version.h>"
      COMMAND ${CMAKE_C_COMPILER} -E -dM -
      OUTPUT_VARIABLE LIB_C_INFO
      ERROR_VARIABLE ERROR_MSG
@@ -31,6 +37,7 @@ macro(GetLibCVersion output)

    set(${output} "${GLIBC_MAJOR}.${GLIBC_MINOR}")

+  unset(ECHO)
    unset(CMAKE_MATCH_1)
    unset(GLIBC_MAJOR)
    unset(GLIBC_MINOR)

> +    COMMAND ${CMAKE_C_COMPILER} -E -dM -
> +    OUTPUT_VARIABLE LIB_C_INFO
> +    ERROR_VARIABLE ERROR_MSG
> +    OUTPUT_STRIP_TRAILING_WHITESPACE
> +    RESULT_VARIABLE RES
> +  )
> +
> +  if(NOT RES EQUAL 0)
> +    message(FATAL_ERROR
> +            "gnu/libc-version preprocessing has failed: '${ERROR_MSG}'")
> +  endif()
> +
> +  string(REGEX MATCH "__GLIBC__ ([0-9]+)" MATCH ${LIB_C_INFO})
> +  if(MATCH)
> +    set(GLIBC_MAJOR ${CMAKE_MATCH_1})
> +  else()
> +    message(FATAL_ERROR "Can't determine GLIBC_MAJOR version.")
> +  endif()
> +
> +  string(REGEX MATCH "__GLIBC_MINOR__ ([0-9]+)" MATCH ${LIB_C_INFO})
> +  if(MATCH)
> +    set(GLIBC_MINOR ${CMAKE_MATCH_1})
> +  else()
> +    message(FATAL_ERROR "Can't determine GLIBC_MINOR version.")
> +  endif()
> +
> +  set(${output} "${GLIBC_MAJOR}.${GLIBC_MINOR}")
> +
> +  unset(CMAKE_MATCH_1)
> +  unset(GLIBC_MAJOR)
> +  unset(GLIBC_MINOR)
> +  unset(MATCH)
> +  unset(RES)
> +  unset(ERROR_MSG)
> +  unset(LIB_C_INFO)
> +endmacro()