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Older toolchains lack alloca so use __builtin_alloca which is more widely available if needed #285

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Merged
craigcomstock merged 1 commit into from
Jul 29, 2026
+19 −0
Merged

Older toolchains lack alloca so use __builtin_alloca which is more widely available if needed #285

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1 change: 1 addition & 0 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -473,6 +473,7 @@ dnl ######################################################################
AC_C_CONST

AC_FUNC_FSEEKO
AC_FUNC_ALLOCA
AC_SYS_LARGEFILE
AC_TYPE_OFF_T

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18 changes: 18 additions & 0 deletions libutils/platform.h
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Expand Up @@ -306,6 +306,24 @@ void globfree(glob_t *pglob);
# endif
#endif

// from https://www.gnu.org/software/autoconf/manual/autoconf-2.60/html_node/Particular-Functions.html
#if HAVE_ALLOCA_H
# include <alloca.h>
#elif defined __GNUC__
# define alloca __builtin_alloca
#elif defined _AIX
# define alloca __alloca
#elif defined _MSC_VER
# include <malloc.h>
# define alloca _alloca
#else
# include <stddef.h>
# ifdef __cplusplus
extern "C"
# endif
void *alloca (size_t);
#endif

#include <fcntl.h>

#ifdef HAVE_VFS_H
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