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Bug #55634 ./configure does not fail if invalid option is used
Submitted: 2011-09-07 13:17 UTC Modified: 2019-07-02 20:25 UTC
Avg. Score:3.7 ± 0.5
Reproduced:2 of 2 (100.0%)
Same Version:1 (50.0%)
Same OS:0 (0.0%)
From: Assigned:
Status: Wont fix Package: *Configuration Issues
PHP Version: 5.3.8 OS:
Private report: No CVE-ID: None
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 [2011-09-07 13:17 UTC]
When using ./configure --with-foo, configure tells me at the end:
> Notice: Following unknown configure options were used:
> --with-foo

There are two problems:
- This problem is echoed to stdout, not stderr where capturing it would be possible
- The exit code is still 0, although I clearly issued a wrong option.

In the end I cannot figure out if the configure run was *fully* successful.

Expected result:
1. config option errors echoed to stderr
2. exit code of configure script != 0


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 [2011-09-07 22:28 UTC]
I'm not saying this behaviour is wrong or right, I've been bitten by this already myself, but I do think that could be considered a BC break, as I remember it always being like that, although I'm only 100% sure on 5.2+
 [2011-09-22 19:07 UTC]
Perhaps a BC compromise here would be to at least *also* echo to stderr, while leaving the existing echo to stdout in place?
 [2011-09-22 19:09 UTC]
well, I do consider it as a bug fix.
 [2013-08-02 11:57 UTC]
It's not always been like that, there have been times where configure ignored 
unknown arguments silently.  So, I'd say, we're open for improvements.
 [2016-09-15 14:08 UTC]
On Windows, configure bails out early if an unknown option is
passed, what I find rather helpful.
 [2019-07-02 00:09 UTC]
The following pull request has been associated:

Patch Name: Use default Autoconf configuration options checkings (bug #55634)
On GitHub:
 [2019-07-02 20:25 UTC]
-Status: Open +Status: Wont fix
 [2019-07-02 20:25 UTC]
Helo, instead of building a custom macro for checking configure options, Autoconf 2.62+ already outputs a warning at the beginning and the end of the output of configure script. It automatically detects correct and wrong options better.

So now instead a better way is the default Autoconf approach:

This outputs a warning at the beginning and end of the configure output:

    ./configure --with-non-existing

This results in fatal error:

    ./configure --non-existing

    configure: error: unrecognized option: `--non-existing'
    Try `./configure --help' for more information

The `--enable-option-checking=fatal` results in fatal error for all non existing options:

    ./configure --with-non-existing --enable-option-checking=fatal

    configure: error: unrecognized options: --with-non-existing

Applied to PHP-7.4+. Hope this helps more now.

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