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| author | ghazi <ghazi@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-03-31 18:59:56 +0000 |
|---|---|---|
| committer | ghazi <ghazi@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-03-31 18:59:56 +0000 |
| commit | a735a1410598023274d56c3636d61bffd8d3fb42 (patch) | |
| tree | 68ea74209b9d94ef6a9ffafe09d4fb89a5bfce2e /include/libiberty.h | |
| parent | fdda3fb9a0d8a3ea3dc15f7fc1decf0b8fc7756b (diff) | |
| download | gcc-a735a1410598023274d56c3636d61bffd8d3fb42.tar.gz | |
* libiberty.h (alloca): Handle setting C_ALLOCA.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@40978 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'include/libiberty.h')
| -rw-r--r-- | include/libiberty.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/libiberty.h b/include/libiberty.h index c7a4d060c11..effe5f628cc 100644 --- a/include/libiberty.h +++ b/include/libiberty.h @@ -238,15 +238,20 @@ extern int vasprintf PARAMS ((char **, const char *, va_list)) /* Drastically simplified alloca configurator. If we're using GCC, we use __builtin_alloca; otherwise we use the C alloca. The C alloca is always available. You can override GCC by defining - USE_C_ALLOCA yourself. */ + USE_C_ALLOCA yourself. The canonical autoconf macro C_ALLOCA is + also set/unset as it is often used to indicate whether code needs + to call alloca(0). */ extern PTR C_alloca PARAMS((size_t)); #undef alloca #if GCC_VERSION >= 2000 && !defined USE_C_ALLOCA # define alloca(x) __builtin_alloca(x) +# undef C_ALLOCA #else # define alloca(x) C_alloca(x) # undef USE_C_ALLOCA # define USE_C_ALLOCA 1 +# undef C_ALLOCA +# define C_ALLOCA 1 #endif #ifdef __cplusplus |