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build: simplify alloca checks. See #1313

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The goal of this commit is to reduce differences between the autotools and meson build.

With autotools AC_FUNC_ALLOCA was used which defines HAVE_ALLOCA_H, HAVE_ALLOCA,
C_ALLOCA. meson tried to replicate that with has_function() but alloca can be a macro
and and is named _alloca under Windows. Since we require a working alloca anyway
and only need to know if the header exists replace AC_FUNC_ALLOCA with a simple
AC_CHECK_HEADERS.

There is still one user of HAVE_ALLOCA in the embedded gnulib, but since alloca is
always provided through galloca.h just force define HAVE_ALLOCA there and add a comment.

The docs were mentioning alloca as an example for cross compiling. Since that variable no
longer exists now replace it with another one.
This commit is contained in:
Christoph Reiter
2018-08-23 17:35:56 +02:00
committed by Christoph Reiter
parent ec4da774e5
commit 11fcc2f1ac
4 changed files with 7 additions and 8 deletions
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4
docs/reference/glib/cross.xml
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@@ -84,8 +84,8 @@ meson --cross_file cross_file.txt builddir
overridden by setting the
<literal>have_<replaceable>function</replaceable></literal> property
to <constant>true</constant> or <constant>false</constant>.
For example <programlisting>Checking for function "alloca" : YES</programlisting>
can be overridden by setting <programlisting>have_alloca = false</programlisting>
For example <programlisting>Checking for function "fsync" : YES</programlisting>
can be overridden by setting <programlisting>have_fsync = false</programlisting>
</para>
</formalpara>
<formalpara>