[ruby-core:121680] [Ruby Bug#21271] Ruby build failure due to invalid probe specifier for dtrace

Issue #21271 has been reported by nekketsuuu (Takuma Ishikawa).

----------------------------------------
Bug #21271: Ruby build failure due to invalid probe specifier for dtrace
https://bugs.ruby-lang.org/issues/21271

* Author: nekketsuuu (Takuma Ishikawa)
* Status: Open
* ruby -v: N/A
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
I've noticed that building the master branch of Ruby fails on my MacBook with the following error about dtrace and probes.h:

```
% make
	BASERUBY = /Users/nekketsuuu/.rbenv/shims/ruby --disable=gems
	CC = clang
	LD = ld
	LDSHARED = clang -dynamiclib
	CFLAGS = -isystem/opt/homebrew/include -isystem/opt/homebrew/include  -fstack-protector-strong -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fdeclspec  -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wextra-tokens -Wdeprecated-declarations -Wdivision-by-zero -Wdiv-by-zero -Wimplicit-function-declaration -Wimplicit-int -Wpointer-arith -Wshorten-64-to-32 -Wwrite-strings -Wold-style-definition -Wmissing-noreturn -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wunused-variable -Wmisleading-indentation -Wundef  -pipe -arch arm64
	XCFLAGS = -fno-strict-overflow -fvisibility=hidden -fexcess-precision=standard -DRUBY_EXPORT -fPIE -I. -I.ext/include/arm64-darwin24 -I../include -I.. -I../prism -I../enc/unicode/15.0.0   -Dmodular_gc_dir=
	CPPFLAGS = -I/opt/homebrew/opt/openssl/include -I/opt/homebrew/opt/mysql-client@8.4/include -I/opt/homebrew/opt/libffi/include -isystem/opt/homebrew/include -I/opt/homebrew/opt/openssl/include -I/opt/homebrew/opt/mysql-client@8.4/include -I/opt/homebrew/opt/libffi/include -isystem/opt/homebrew/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   
	DLDFLAGS = -L/opt/homebrew/opt/openssl/lib -L/opt/homebrew/opt/mysql-client@8.4/lib -L/opt/homebrew/opt/libffi/lib -L/opt/homebrew/lib -L/opt/homebrew/opt/openssl/lib -L/opt/homebrew/opt/mysql-client@8.4/lib -L/opt/homebrew/opt/libffi/lib -L/opt/homebrew/lib  -Wl,-undefined,dynamic_lookup -fstack-protector-strong -Wl,-pie -framework CoreFoundation  -arch arm64
	SOLIBS = -lgmp -ldl -lobjc -lpthread 
	LANG = ja_JP.UTF-8
	LC_ALL = 
	LC_CTYPE = 
	MFLAGS = 
	RUSTC = rustc
	YJIT_RUSTC_ARGS = --crate-name=yjit --crate-type=staticlib --edition=2021 -g -C lto=thin -C opt-level=3 -C overflow-checks=on '--out-dir=/Users/nekketsuuu/dev/src/github.com/ruby/ruby/build/yjit/target/release/' ../yjit/src/lib.rs
Apple clang version 16.0.0 (clang-1600.0.26.3)
Target: arm64-apple-darwin24.4.0
Thread model: posix
InstalledDir: /Applications/Xcode_16.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
compiling ../main.c
compiling ../dmydln.c
generating id.h
id.h updated
generating miniprelude.c
miniprelude.c updated
compiling ../miniinit.c
making ../array.rbinc
/Users/nekketsuuu/.rbenv/shims/ruby --disable=gems ../tool/gen_dummy_probes.rb ../probes.d > probes.dmyh
translating probes ../probes.d
dtrace: invalid probe specifier system/opt/homebrew/include: syntax error near end of input
make: *** [probes.h] Error 1
```

With running `git bisect`, I found that the build started failing after the commit 060ae17c806f0ba955b1c5d825b890b6de6c47e3 https://github.com/ruby/ruby/commit/060ae17c806f0ba955b1c5d825b890b6de6c47e3 (between Ruby 3.4.3 d0b7e5b6a04bde21ca483d20a1546b28b401c2d4 and the HEAD 7e2ba5a91bcdc31e14502f797a6184e3f4d41747).

I'm not sure if this is a problem of my local configurations or a build script. Here is a summary of my configurations:

```
Configuration summary for ruby version 3.5.0

   * Installation prefix: /Users/nekketsuuu/.rbenv/versions/master
   * exec prefix:         ${prefix}
   * arch:                arm64-darwin24
   * site arch:           ${arch}
   * RUBY_BASE_NAME:      ruby
   * ruby lib prefix:     ${libdir}/${RUBY_BASE_NAME}
   * site libraries path: ${rubylibprefix}/${sitearch}
   * vendor path:         ${rubylibprefix}/vendor_ruby
   * target OS:           darwin24
   * compiler:            clang
   * with thread:         pthread
   * with coroutine:      arm64
   * with modular GC:     no
   * enable shared libs:  no
   * dynamic library ext: bundle
   * CFLAGS:              ${hardenflags} -fdeclspec  ${optflags} \
                          ${debugflags} ${warnflags}
   * LDFLAGS:             -L. -L/opt/homebrew/opt/openssl/lib \
                          -L/opt/homebrew/opt/mysql-client@8.4/lib \
                          -L/opt/homebrew/opt/libffi/lib \
                          -L/opt/homebrew/lib \
                          -L/opt/homebrew/opt/openssl/lib \
                          -L/opt/homebrew/opt/mysql-client@8.4/lib \
                          -L/opt/homebrew/opt/libffi/lib \
                          -L/opt/homebrew/lib  -fstack-protector-strong
   * DLDFLAGS:            -L/opt/homebrew/opt/openssl/lib \
                          -L/opt/homebrew/opt/mysql-client@8.4/lib \
                          -L/opt/homebrew/opt/libffi/lib \
                          -L/opt/homebrew/lib \
                          -L/opt/homebrew/opt/openssl/lib \
                          -L/opt/homebrew/opt/mysql-client@8.4/lib \
                          -L/opt/homebrew/opt/libffi/lib \
                          -L/opt/homebrew/lib  -Wl,-undefined,dynamic_lookup
   * optflags:            -O3 -fno-fast-math
   * debugflags:          -ggdb3
   * warnflags:           -Wall -Wextra -Wextra-tokens \
                          -Wdeprecated-declarations -Wdivision-by-zero \
                          -Wdiv-by-zero -Wimplicit-function-declaration \
                          -Wimplicit-int -Wpointer-arith -Wshorten-64-to-32 \
                          -Wwrite-strings -Wold-style-definition \
                          -Wmissing-noreturn -Wno-cast-function-type \
                          -Wno-constant-logical-operand -Wno-long-long \
                          -Wno-missing-field-initializers \
                          -Wno-overlength-strings -Wno-parentheses-equality \
                          -Wno-self-assign -Wno-tautological-compare \
                          -Wno-unused-parameter -Wno-unused-value \
                          -Wunused-variable -Wmisleading-indentation -Wundef
   * hardenflags:         -fstack-protector-strong -U_FORTIFY_SOURCE \
                          -D_FORTIFY_SOURCE=2
   * strip command:       strip -A -n
   * install doc:         rdoc
   * YJIT support:        yes
   * RJIT support:        yes
   * man page type:       doc
   * BASERUBY -v:         ruby 3.4.1 (2024-12-25 revision 48d4efcb85) \
                          +PRISM [arm64-darwin24]
```

and here is a full command logs by `make Q=`:

```
translating probes ../probes.d
dtrace -xnolibs -o probes.h.tmp -h -C -I. -I.ext/include/arm64-darwin24 -I../include -I.. -I../prism -I../enc/unicode/15.0.0  -I/opt/homebrew/opt/openssl/include -I/opt/homebrew/opt/mysql-client@8.4/include -I/opt/homebrew/opt/libffi/include -isystem/opt/homebrew/include -I/opt/homebrew/opt/openssl/include -I/opt/homebrew/opt/mysql-client@8.4/include -I/opt/homebrew/opt/libffi/include -isystem/opt/homebrew/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT    -s ../probes.d
dtrace: invalid probe specifier system/opt/homebrew/include: syntax error near end of input
make: *** [probes.h] Error 1
```

It appears that CPPFLAGS contains `-isystem` flag, and dtrace might handle it as `-i` flag.

This is my first time submitting a bug issue here. Feel free to correct me if there are any mistakes. Also, let me know if more information is needed.



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