diff options
| -rw-r--r-- | configure.ac | 1 | ||||
| -rw-r--r-- | m4/cares-compilers.m4 | 64 |
2 files changed, 64 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 14f580c..b779c2f 100644 --- a/configure.ac +++ b/configure.ac @@ -160,6 +160,7 @@ esac CARES_CHECK_COMPILER_HALT_ON_ERROR CARES_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE +CARES_CHECK_COMPILER_STRUCT_MEMBER_SIZE dnl ********************************************************************** dnl Compilation based checks should not be done before this point. diff --git a/m4/cares-compilers.m4 b/m4/cares-compilers.m4 index 80f4d1b..2bfe856 100644 --- a/m4/cares-compilers.m4 +++ b/m4/cares-compilers.m4 @@ -16,7 +16,7 @@ #*************************************************************************** # File version for 'aclocal' use. Keep it a single number. -# serial 49 +# serial 50 dnl CARES_CHECK_COMPILER @@ -1168,6 +1168,68 @@ AC_DEFUN([CARES_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE], [ ]) +dnl CARES_CHECK_COMPILER_STRUCT_MEMBER_SIZE +dnl ------------------------------------------------- +dnl Verifies if the compiler is capable of handling the +dnl size of a struct member, struct which is a function +dnl result, as a compilation-time condition inside the +dnl type definition of a constant array. + +AC_DEFUN([CARES_CHECK_COMPILER_STRUCT_MEMBER_SIZE], [ + AC_REQUIRE([CARES_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE])dnl + AC_MSG_CHECKING([if compiler struct member size checking works]) + tst_compiler_check_one_works="unknown" + AC_COMPILE_IFELSE([ + AC_LANG_PROGRAM([[ + struct mystruct { + int mi; + char mc; + struct mystruct *next; + }; + struct mystruct myfunc(); + typedef char good_t1[sizeof(myfunc().mi) == sizeof(int) ? 1 : -1 ]; + typedef char good_t2[sizeof(myfunc().mc) == sizeof(char) ? 1 : -1 ]; + ]],[[ + good_t1 dummy1; + good_t2 dummy2; + ]]) + ],[ + tst_compiler_check_one_works="yes" + ],[ + tst_compiler_check_one_works="no" + sed 's/^/cc-src: /' conftest.$ac_ext >&6 + sed 's/^/cc-err: /' conftest.err >&6 + ]) + tst_compiler_check_two_works="unknown" + AC_COMPILE_IFELSE([ + AC_LANG_PROGRAM([[ + struct mystruct { + int mi; + char mc; + struct mystruct *next; + }; + struct mystruct myfunc(); + typedef char bad_t1[sizeof(myfunc().mi) != sizeof(int) ? 1 : -1 ]; + typedef char bad_t2[sizeof(myfunc().mc) != sizeof(char) ? 1 : -1 ]; + ]],[[ + bad_t1 dummy1; + bad_t2 dummy2; + ]]) + ],[ + tst_compiler_check_two_works="no" + ],[ + tst_compiler_check_two_works="yes" + ]) + if test "$tst_compiler_check_one_works" = "yes" && + test "$tst_compiler_check_two_works" = "yes"; then + AC_MSG_RESULT([yes]) + else + AC_MSG_RESULT([no]) + AC_MSG_ERROR([compiler fails struct member size checking.]) + fi +]) + + dnl CARES_VAR_MATCH (VARNAME, VALUE) dnl ------------------------------------------------- dnl Verifies if shell variable VARNAME contains VALUE. |