Profiler compilation failure related to malloc_stats function missing

[ivoanjo]

Current behaviour

Reported by @mintuhouse. It seems there may be an issue with the change from #3425, as reported in https://github.com/DataDog/dd-trace-rb/pull/3425#issuecomment-1962724499 .

I'm opening this ticket to investigate the issue.

When I try to install the gem inside docker on M1/ARM Mac, getting error

LD_LIBRARY_PATH=.:/opt/rubies/ruby-3.3.0/lib "gcc -o conftest -I/opt/rubies/ruby-3.3.0/include/ruby-3.3.0/aarch64-linux -I/opt/rubies/ruby-3.3.0/include/ruby-3.3.0/ruby/backward -I/opt/rubies/ruby-3.3.0/include/ruby-3.3.0 -I.    -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wdeprecated-declarations -Wdiv-by-zero -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wpointer-arith -Wwrite-strings -Wold-style-definition -Wimplicit-fallthrough=0 -Wmissing-noreturn -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-packed-bitfield-compat -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wunused-variable -Wmisleading-indentation -Wundef -std=gnu99 -Wno-unused-function -Wno-declaration-after-statement -Werror-implicit-function-declaration -fvisibility=hidden -Wold-style-definition -Wall -Wextra conftest.c  -L. -L/opt/rubies/ruby-3.3.0/lib -Wl,-rpath,/opt/rubies/ruby-3.3.0/lib -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/opt/rubies/ruby-3.3.0/lib -L/opt/rubies/ruby-3.3.0/lib -lruby-static -lz -lrt -lrt -ldl -lcrypt -lm -lpthread   -lm -lpthread  -lc"
conftest.c: In function ‘t’:
conftest.c:14:57: error: ‘malloc_stats’ undeclared (first use in this function)
   14 | int t(void) { void ((*volatile p)()); p = (void ((*)()))malloc_stats; return !p; }
      |                                                         ^~~~~~~~~~~~

Expected behaviour

Profiler compilation should not be affected by missing malloc_stats.

Steps to reproduce

Still trying to figure this out.

Environment

• ddtrace version: 1.20.0?
• Configuration block (Datadog.configure ...): ?
• Ruby version: 3.3.0
• Operating system: macOS, arm64
• Relevant library versions: ?

[ivoanjo]

A compilation failure caused by malloc_stats being missing is not expected at all, since the code is supposed to gracefully degrade when it's not available.

@mintuhouse I noticed the log you shared is a snippet for Ruby's mkmf.log. Could you share the full mkmf.log you get, as well as any other messages you see when installing the gem fails?