Bruno Haible <br...@clisp.org> writes: > Vivien Kraus wrote: >> I don’t know how to do it at the moment; the >> configure script automatically gets a --enable-shared=… flag but I >> can’t find a trace of it in config.log, and I don’t know how to use it. >> Could you elaborate on how to get a value for BUILDING_SHARED with >> autoconf? > > A couple of lines in configure.ac should do it: > > if test "$enable_shared" = yes; then > shared=1 > else > shared=0 > fi > AC_DEFINE_UNQUOTED([BUILDING_SHARED], [$shared], [Define when > --enable-shared is used.])
I installed the following to make this easier to use for readers of the manual. I'll update my usage of that code too, it is used in several projects already... /Simon
From ad1f365d71ac8a80b8c83f41d35d35a1ef57378c Mon Sep 17 00:00:00 2001
From: Simon Josefsson <si...@josefsson.org>
Date: Fri, 8 Jul 2022 21:39:45 +0200
Subject: [PATCH] lib-symbol-visibility: Improve documentation.
* doc/lib-symbol-visibility.texi: Include BUILDING_SHARED snippet
suggested by Bruno Haible.
---
ChangeLog | 6 ++++++
doc/lib-symbol-visibility.texi | 10 ++++++++++
2 files changed, 16 insertions(+)
diff --git a/ChangeLog b/ChangeLog
index 75d24781c2..a82e76ed00 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2022-07-08 Simon Josefsson <si...@josefsson.org>
+
+ lib-symbol-visibility: Improve documentation.
+ * doc/lib-symbol-visibility.texi: Include BUILDING_SHARED snippet
+ suggested by Bruno Haible.
+
2022-07-04 Bruno Haible <br...@clisp.org>
havelib: Fix 'configure --help' output.
diff --git a/doc/lib-symbol-visibility.texi b/doc/lib-symbol-visibility.texi
index 9574e439dd..d8e63895d3 100644
--- a/doc/lib-symbol-visibility.texi
+++ b/doc/lib-symbol-visibility.texi
@@ -181,3 +181,13 @@ the definition of the macro mentioned above, to something like this:
Here @code{BUILDING_SHARED} is a C macro that you have to define. It
ought to evaluate to 1 in a build configured with @samp{--enable-shared},
or to 0 in a build configured with @samp{--disable-shared}.
+You may use the following @samp{configure.ac} snippet:
+
+@smallexample
+ if test "$enable_shared" = yes; then
+ shared=1
+ else
+ shared=0
+ fi
+ AC_DEFINE_UNQUOTED([BUILDING_SHARED], [$shared], [Define when --enable-shared is used.])
+@end smallexample
--
2.30.2
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