Inline GDB scripts in the PHP binary (php#13600)

This inlines .gdbinit and php_gdb.py in the .debug_gdb_scripts section of the PHP binary so that GDB can auto-load them regardless of the current directory or the availability of the PHP source code (albeit some functionalities of php_gdb.py currently rely on the source being available).

.gitattributes

@@ -21,6 +21,7 @@
 
 # Collapse generated files within git and pull request diff.
 **/*_arginfo.h linguist-generated -diff
+/main/gdb_inlined_script.c linguist-generated -diff
 /Zend/zend_vm_execute.h linguist-generated -diff
 /Zend/zend_vm_handlers.h linguist-generated -diff
 /Zend/zend_vm_opcodes.[ch] linguist-generated -diff

.github/actions/verify-generated-files/action.yml

@@ -8,6 +8,7 @@ runs:
         [[ "$OSTYPE" == "darwin"* ]] && export PATH="$(brew --prefix)/opt/bison/bin:$PATH"
         scripts/dev/credits
         scripts/dev/genfiles
+        scripts/gdb/debug_gdb_scripts_gen.php
         Zend/zend_vm_gen.php
         ext/tokenizer/tokenizer_data_gen.php
         build/gen_stub.php -f --generate-optimizer-info --verify

configure.ac

@@ -1700,6 +1700,17 @@ PHP_ADD_SOURCES(main, main.c snprintf.c spprintf.c \
        network.c php_open_temporary_file.c php_odbc_utils.c safe_bcmp.c \
        output.c getopt.c php_syslog.c, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1)
 
+if printf "#if __ELF__\nelf\n#endif\n" | $CC -E - | grep elf > /dev/null; then
+  PHP_ADD_SOURCES(main, debug_gdb_scripts.c)
+
+  cat >> Makefile.objects <<EOF
+$abs_srcdir/main/debug_gdb_scripts.c: $abs_srcdir/scripts/gdb/debug_gdb_scripts_gen.php $abs_srcdir/scripts/gdb/php_gdb.py $abs_srcdir/.gdbinit
+	@if test ! -z "\$(PHP)"; then \\
+		\$(PHP) $abs_srcdir/scripts/gdb/debug_gdb_scripts_gen.php; \\
+	fi;
+EOF
+fi
+
 PHP_ADD_SOURCES_X(main, fastcgi.c, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1, PHP_FASTCGI_OBJS, no)
 
 PHP_ADD_SOURCES(main/streams, streams.c cast.c memory.c filter.c \