diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/configure.in b/configure.in index 3b1d49e4..50c149a8 100644 --- a/configure.in +++ b/configure.in @@ -784,6 +784,37 @@ AC_PROG_CC AM_PROG_CC_C_O AC_PROG_RANLIB +# Look for environ alternatives. Possibility #1: is environ in unistd.h? +AC_MSG_CHECKING([for environ in unistd.h]) +AC_COMPILE_IFELSE([ +#define _GNU_SOURCE +#include <unistd.h> +int main(int argc, char **argv) { char **ep = environ; } + ], [ + AC_MSG_RESULT([yes]) + has_environ=yes + ], [ + AC_MSG_RESULT([no]) + + # Possibility #2: can environ be found in an available library? + AC_MSG_CHECKING([for extern environ]) + AC_LINK_IFELSE([ +extern char **environ; +int main(int argc, char **argv) { char **ep = environ; } + ], [ + AC_DEFINE(NEED_ENVIRON_EXTERN, [1], [Must declare 'environ' to use it.]) + has_environ=yes + ], [ + has_environ=no + ]) + AC_MSG_RESULT([${has_environ}]) + ]) + +if test "${has_environ}" != "yes" ; then + AC_MSG_FAILURE([Could find 'environ' in unistd.h or available libraries.]) +fi + + # set default gcc warnings GCC_WARNINGS="-Wall -Wstrict-prototypes -Wformat-security" if test "${gcc_wextra}" = yes; then |