File 3821-Compile-escripts-by-default.patch of Package erlang

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File 3821-Compile-escripts-by-default.patch of Package erlang

From e1a5d0e69938a186e2f38d21b98535685e0ef432 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Fri, 2 Jun 2023 05:55:49 +0200
Subject: [PATCH] Compile escripts by default

The current default when running an escript is to interpret it using
the `erl_eval` module. In the ancient times when escript was invented
that made sense. Interpretation would be slower and some language
constructs would not work, but execution could start immediately
without waiting for the compiler to finish.

Nowadays with faster computers it makes less sense.

Therefore, in Erlang/OTP 27, change the default to compile the
escript. That will require the escript to be executed by an Erlang
system that includes the Erlang compiler.
---
 erts/doc/src/escript_cmd.xml      | 17 ++++----
 lib/stdlib/src/escript.erl        |  2 +-
 lib/stdlib/test/escript_SUITE.erl | 64 ++++++++++++++++---------------
 3 files changed, 44 insertions(+), 39 deletions(-)

diff --git a/erts/doc/src/escript_cmd.xml b/erts/doc/src/escript_cmd.xml
index bb2a86798a..945917f491 100644
--- a/erts/doc/src/escript_cmd.xml
+++ b/erts/doc/src/escript_cmd.xml
@@ -185,15 +185,16 @@ halt(1).</pre>
 <c>127</c>.
 Both the module declaration and the export declaration of
 the <c>main/1</c> function are optional.
- By default, the script will be interpreted. You can force
- it to be compiled by including the following line somewhere
- in the script file:
+ By default, the script will be compiled by the Erlang compiler.
+ It is possible to force it to be interpreted by including
+ the following line somewhere in the script file:
 <pre>
--mode(compile).</pre>
- Execution of interpreted code is slower than compiled code.
- If much of the execution takes place in interpreted code, it
- can be worthwhile to compile it, although the compilation
- itself takes a little while.
+-mode(interpret).</pre>
+ Execution of interpreted code is slower than compiled code,
+ and some language constructs will not work, but there is no
+ requirement for the Erlang compiler application to be available.
+ <change>Before the Erlang/OTP 27 the script would be
+ interpreted by default.</change>
 As mentioned earlier, a script can
 contains precompiled <c>beam</c> code. In a precompiled
 script, the interpretation of the script header is
diff --git a/lib/stdlib/src/escript.erl b/lib/stdlib/src/escript.erl
index a2280bf690..6db6656380 100644
--- a/lib/stdlib/src/escript.erl
+++ b/lib/stdlib/src/escript.erl
@@ -431,7 +431,7 @@ do_parse_file(Type, File, Fd, StartLine, HeaderSz, CheckOnly) ->
 initial_state(File) ->
 #state{file = File,
 	 n_errors = 0,
-	 mode = interpret,
+	 mode = compile,
 	 exports_main = false,
 	 has_records = false}.
 
diff --git a/lib/stdlib/test/escript_SUITE.erl b/lib/stdlib/test/escript_SUITE.erl
index 77238d2796..d65eccdb84 100644
--- a/lib/stdlib/test/escript_SUITE.erl
+++ b/lib/stdlib/test/escript_SUITE.erl
@@ -89,25 +89,28 @@ basic(Config) when is_list(Config) ->
 run(Config, Dir, "factorial_compile_main 7",
 	<<"factorial 7 = 5040\nExitCode:0">>),
 run(Config, Dir, "factorial_warning 20",
-	[data_dir,<<"factorial_warning:12:1: Warning: function bar/0 is unused\n"
-		 "factorial 20 = 2432902008176640000\nExitCode:0">>]),
- run_with_opts(Config, Dir, "-s", "factorial_warning",
-		 [data_dir,<<"factorial_warning:12:1: Warning: function bar/0 is unused\n"
- "% 12| bar() ->\n"
- "% | ^\n\n"
- "ExitCode:0">>]),
- run_with_opts(Config, Dir, "-s -i", "factorial_warning",
-		 [data_dir,<<"factorial_warning:12:1: Warning: function bar/0 is unused\n"
- "% 12| bar() ->\n"
- "% | ^\n\n"
- "ExitCode:0">>]),
- run_with_opts(Config, Dir, "-c -s", "factorial_warning",
-		 [data_dir,<<"factorial_warning:12:1: Warning: function bar/0 is unused\n"
- "% 12| bar() ->\n"
- "% | ^\n\n"
- "ExitCode:0">>]),
+ [data_dir,<<"factorial_warning:12:1: Warning: function bar/0 is unused\n"
+ "% 12| bar() ->\n"
+ "% | ^\n\n"
+ "factorial 20 = 2432902008176640000\n"
+ "ExitCode:0">>]),
+ run_with_opts(Config, Dir, "-i", "factorial_warning 20",
+ [data_dir,<<"factorial_warning:12:1: Warning: function bar/0 is unused\n"
+ "factorial 20 = 2432902008176640000\nExitCode:0">>]),
+ Warnings = [data_dir,<<"factorial_warning:12:1: Warning: function bar/0 is unused\n"
+ "% 12| bar() ->\n"
+ "% | ^\n\n"
+ "ExitCode:0">>],
+ run_with_opts(Config, Dir, "-s", "factorial_warning", Warnings),
+ run_with_opts(Config, Dir, "-s -i", "factorial_warning", Warnings),
+ run_with_opts(Config, Dir, "-c -s", "factorial_warning", Warnings),
 run(Config, Dir, "filesize "++filename:join(proplists:get_value(data_dir, Config),"filesize"),
-	[data_dir,<<"filesize:11:1: Warning: function id/1 is unused\n324\nExitCode:0">>]),
+	[data_dir,<<"filesize:11:1: Warning: function id/1 is unused\n"
+ "% 11| id(I) -> I.\n"
+ "% | ^\n"
+ "\n"
+ "324\n"
+ "ExitCode:0">>]),
 run(Config, Dir, "test_script_name",
 	[data_dir,<<"test_script_name\nExitCode:0">>]),
 run(Config, Dir, "tail_rec 1000",
@@ -128,18 +131,19 @@ errors(Config) when is_list(Config) ->
 	[data_dir,<<"compile_error:5:12: syntax error before: '*'\n">>,
 	 data_dir,<<"compile_error:8:9: syntax error before: blarf\n">>,
 	 <<"escript: There were compilation errors.\nExitCode:127">>]),
- run(Config, Dir, "lint_error",
-	[data_dir,<<"lint_error:6:1: function main/1 already defined\n">>,
-	 data_dir,"lint_error:8:10: variable 'ExitCode' is unbound\n",
-	 <<"escript: There were compilation errors.\nExitCode:127">>]),
- run_with_opts(Config, Dir, "-s", "lint_error",
-		 [data_dir,<<"lint_error:6:1: function main/1 already defined\n"
- "% 6| main(Args) ->\n"
- "% | ^\n\n">>,
-		 data_dir,("lint_error:8:10: variable 'ExitCode' is unbound\n"
- "% 8| halt(ExitCode).\n"
- "% | ^\n\n"),
-		 <<"escript: There were compilation errors.\nExitCode:127">>]),
+ CompileErrors = [data_dir,<<"lint_error:6:1: function main/1 already defined\n"
+ "% 6| main(Args) ->\n"
+ "% | ^\n\n">>,
+ data_dir,("lint_error:8:10: variable 'ExitCode' is unbound\n"
+ "% 8| halt(ExitCode).\n"
+ "% | ^\n\n"),
+ <<"escript: There were compilation errors.\nExitCode:127">>],
+ run(Config, Dir, "lint_error", CompileErrors),
+ run_with_opts(Config, Dir, "-i", "lint_error",
+ [data_dir,<<"lint_error:6:1: function main/1 already defined\n">>,
+ data_dir,"lint_error:8:10: variable 'ExitCode' is unbound\n",
+ <<"escript: There were compilation errors.\nExitCode:127">>]),
+ run_with_opts(Config, Dir, "-s", "lint_error", CompileErrors),
 ok.
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-- 
2.35.3

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File 3821-Compile-escripts-by-default.patch of Package erlang

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