[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5720 Add enabling extension definitions for `-std=c++11` option The compiler option `-std=c++11` means to follow the strict C++11 standard, and cannot use several extensions such as POSIX functions/definitions (e.g. M_PI, strdup, putenv, and chroot). With the option, some environments (e.g. Linux) can use the extensions as it is, but other environments require definitions (e.g. `_GNU_SOURCE`) to enable the extensions. This commit makes configure script checks the environments and adds the definitions.

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• summary: Fix C++11 option --> Add enabling extension definitions for -std=c++11 option The compiler option -std=c++11 means to follow the strict C++11 standard, and cannot use several extensions such as POSIX functions/definitions (e.g. M_PI, strdup, putenv, and chroot). With the option, some environments (e.g. Linux) can use the extensions as it is, but other environments require definitions (e.g. _GNU_SOURCE) to enable the extensions. This commit makes configure script checks the environments and adds the definitions.
• Description has changed:

Diff:

--- old
+++ new
@@ -1,14 +1,15 @@
-Fix C++11 option
+The compiler option `-std=c++11` means
+to follow the strict C++11 standard,
+and cannot use several extensions
+such as POSIX functions/definitions
+(e.g. M_PI, strdup, putenv, and chroot).

-On the Linux environments,
-`M_PI` definition can be used with the `-std=c++11` option.
-However, on the other environments (e.g. MinGW),
-`M_PI` cannot be used with the `-std=c++11` option.
+With the option, some environments (e.g. Linux)
+can use the extensions as it is,
+but other environments require definitions (e.g. `_GNU_SOURCE`)
+to enable the extensions.

-Originally `-std=c++11` is an option to follow the strict C++ standard,
-and cannot use `M_PI` that is not in the C++ standard.
-To use `M_PI`, `-std=gnu++11` instead of `-std=c++11` is required.
-
-Also, the current default for g++ is `-std=gnu++14`, not `-std=c++14`.
+This commit makes
+configure script checks the environments and adds the definitions.

 http://codereview.appspot.com/579270051

• Needs: -->
• Type: -->
• Comment:

use AC_USE_SYSTEM_EXTENSIONS
Reply

http://codereview.appspot.com/579270051

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[issues:#5720] Add enabling extension definitions for -std=c++11 option The compiler option -std=c++11 means to follow the strict C++11 standard, and cannot use several extensions such as POSIX functions/definitions (e.g. M_PI, strdup, putenv, and chroot). With the option, some environments (e.g. Linux) can use the extensions as it is, but other environments require definitions (e.g. _GNU_SOURCE) to enable the extensions. This commit makes configure script checks the environments and adds the definitions.

Status: Started
Created: Sat Feb 01, 2020 06:13 AM UTC by Masamichi Hosoda
Last Updated: Sun Feb 02, 2020 04:46 AM UTC
Owner: Masamichi Hosoda

The compiler option -std=c++11 means
to follow the strict C++11 standard,
and cannot use several extensions
such as POSIX functions/definitions
(e.g. M_PI, strdup, putenv, and chroot).

With the option, some environments (e.g. Linux)
can use the extensions as it is,
but other environments require definitions (e.g. _GNU_SOURCE)
to enable the extensions.

This commit makes
configure script checks the environments and adds the definitions.

http://codereview.appspot.com/579270051

---

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