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| author | Marek Polacek <polacek@redhat.com> | 2014-03-26 06:58:15 +0000 |
|---|---|---|
| committer | Marek Polacek <mpolacek@gcc.gnu.org> | 2014-03-26 06:58:15 +0000 |
| commit | d615d763225f330cf5416c95ad0726db67e227b4 (patch) | |
| tree | 73fbf5143620b481bbb51bdf7050a4ac03459168 /gcc | |
| parent | 1b2265295a971edc5083140d8aeaa944534916a3 (diff) | |
| download | gcc-d615d763225f330cf5416c95ad0726db67e227b4.zip gcc-d615d763225f330cf5416c95ad0726db67e227b4.tar.gz gcc-d615d763225f330cf5416c95ad0726db67e227b4.tar.bz2 | |
re PR c/37428 (GNU VLA-in-structure extension is undocumented)
PR c/37428
* doc/extend.texi (C Extensions): Mention variable-length arrays in
a structure/union.
From-SVN: r208836
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/doc/extend.texi | 12 |
2 files changed, 18 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ff4a21b..8680951 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,11 @@ 2014-03-26 Marek Polacek <polacek@redhat.com> + PR c/37428 + * doc/extend.texi (C Extensions): Mention variable-length arrays in + a structure/union. + +2014-03-26 Marek Polacek <polacek@redhat.com> + PR c/39525 * doc/extend.texi (Designated Inits): Describe what happens to omitted field members. diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 90bf6d8..1928622 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -1592,6 +1592,18 @@ Jumping or breaking out of the scope of the array name deallocates the storage. Jumping into the scope is not allowed; you get an error message for it. +@cindex variable-length array in a structure +As an extension, GCC accepts variable-length arrays as a member of +a structure or a union. For example: + +@smallexample +void +foo (int n) +@{ + struct S @{ int x[n]; @}; +@} +@end smallexample + @cindex @code{alloca} vs variable-length arrays You can use the function @code{alloca} to get an effect much like variable-length arrays. The function @code{alloca} is available in |