Bug #11962
closedRuby 2.3.0 causing compile failure on extensions using a C++ compiler
Description
Hello,
I'm a contributor with the SciRuby foundation, and we have a gem called nmatrix, which is a ruby gem for linear algebra processing in Ruby.
For representing different types of data, nmatrix makes heavy use of C++ templates, which requires compilation with g++. Currently we wrap the code that defines ruby functions at C level in an extern "C" {}
block in a .cpp file and use g++ to compile the file as a whole.
Upgrading to ruby 2.3.0 has caused a problem because of this change implemented in the internals of the ruby C API.
As specified in the GCC docs (https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html) the function "__builtin_choose_expr" (that has been introduced in the latest Ruby C API) is available only for C. Thus the change is rendering our C++ extensions useless.
You can see the compile error being caused in nmatrix here: https://github.com/SciRuby/nmatrix/issues/429
I have come up with a temporary fix for this, but its only patch work and will need to be done by every single extension employing a C++ compiler.
Looking forward to a positive response from you.
Updated by hsbt (Hiroshi SHIBATA) almost 9 years ago
- Assignee set to nobu (Nobuyoshi Nakada)
Updated by mrkn (Kenta Murata) almost 9 years ago
Can I fix it by the following change?
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 7aabf5b..72523c6 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -874,7 +874,7 @@ struct RBasic {
VALUE rb_obj_hide(VALUE obj);
VALUE rb_obj_reveal(VALUE obj, VALUE klass); /* do not use this API to change klass information */
-#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P)
+#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P) && !defined(__cplusplus)
# define RB_OBJ_WB_UNPROTECT_FOR(type, obj) \
__extension__( \
__builtin_choose_expr( \
Updated by mrkn (Kenta Murata) almost 9 years ago
I found the other place to be fixed.
The following patch is the complete version.
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 7aabf5b..a2f42c8 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -620,7 +620,7 @@ int ruby_safe_level_2_warning(void) __attribute__((warning("$SAFE=2 to 4 are obs
# ifdef RUBY_EXPORT
# define ruby_safe_level_2_warning() ruby_safe_level_2_error()
# endif
-#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P)
+#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P) && !defined(__cplusplus)
# define RUBY_SAFE_LEVEL_INVALID_P(level) \
__extension__(\
__builtin_choose_expr(\
@@ -874,7 +874,7 @@ struct RBasic {
VALUE rb_obj_hide(VALUE obj);
VALUE rb_obj_reveal(VALUE obj, VALUE klass); /* do not use this API to change klass information */
-#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P)
+#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P) && !defined(__cplusplus)
# define RB_OBJ_WB_UNPROTECT_FOR(type, obj) \
__extension__( \
__builtin_choose_expr( \
@@ -1376,7 +1376,7 @@ rb_data_object_wrap_warning(VALUE klass, void *ptr, RUBY_DATA_FUNC mark, RUBY_DA
return rb_data_object_wrap(klass, ptr, mark, free);
}
-#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P)
+#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P) && !defined(__cplusplus)
#define rb_data_object_wrap_warning(klass, ptr, mark, free) \
__extension__( \
__builtin_choose_expr( \
diff --git a/include/ruby/st.h b/include/ruby/st.h
index 190bad2..97c08b1 100644
--- a/include/ruby/st.h
+++ b/include/ruby/st.h
@@ -59,7 +59,7 @@ struct st_hash_type {
#define ST_INDEX_BITS (sizeof(st_index_t) * CHAR_BIT)
-#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR) && defined(HAVE_BUILTIN___BUILTIN_TYPES_COMPATIBLE_P)
+#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR) && defined(HAVE_BUILTIN___BUILTIN_TYPES_COMPATIBLE_P) && !defined(__cplusplus)
# define ST_DATA_COMPATIBLE_P(type) \
__builtin_choose_expr(__builtin_types_compatible_p(type, st_data_t), 1, 0)
#else
Updated by mrkn (Kenta Murata) almost 9 years ago
- Status changed from Open to Closed
Applied in changeset r53455.
- ruby.h: undef HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P
and HAVE_BUILTIN___BUILTIN_TYPES_COMPATIBLE_P on C++.
[ruby-core:72736] [Bug #11962]
Updated by vo.x (Vit Ondruch) almost 9 years ago
- Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN to 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: REQUIRED
Updated by vo.x (Vit Ondruch) almost 9 years ago
BTW this causes issues compiling SWIG:
Updated by terceiro (Antonio Terceiro) over 8 years ago
We are trying to transition Debian unstable to ruby2.3, it would be very helpful to have this applied to the 2.3 branch.
Updated by usa (Usaku NAKAMURA) over 8 years ago
- Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: REQUIRED to 2.1: DONTNEED, 2.2: REQUIRED, 2.3: REQUIRED
Updated by nagachika (Tomoyuki Chikanaga) over 8 years ago
- Backport changed from 2.1: DONTNEED, 2.2: REQUIRED, 2.3: REQUIRED to 2.1: DONTNEED, 2.2: DONE, 2.3: REQUIRED
Backported into ruby_2_2
branch at r54315.
Updated by naruse (Yui NARUSE) over 8 years ago
- Backport changed from 2.1: DONTNEED, 2.2: DONE, 2.3: REQUIRED to 2.1: DONTNEED, 2.2: DONE, 2.3: DONE
ruby_2_3 r54364 merged revision(s) 53455.