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| author | Zack Weinberg <zackw@panix.com> | 2020-12-07 11:49:52 -0500 |
|---|---|---|
| committer | Zack Weinberg <zackw@panix.com> | 2020-12-07 11:49:52 -0500 |
| commit | d132ea0278f574fbb3c8d433ea094e36ece73ba1 (patch) | |
| tree | f38d3731a4e262658b35981efe7f0a306b54f4f7 /lib/autoconf/c.m4 | |
| parent | b4ec547b86e6dd878d312cc79dddabce825a4492 (diff) | |
| download | autoconf-d132ea0278f574fbb3c8d433ea094e36ece73ba1.tar.gz | |
Add checks of __STDC__ and __STDC_VERSION__ to C conformance tests.
This makes the C conformance tests more consistent with the C++
conformance tests, and should also speed up cycling through the
possible options to turn on C99/C11.
Tested with gcc, clang, SunPRO C, and AIX xlc.
* lib/autoconf/c.m4 (_AC_C_C89_TEST_GLOBALS): Add preprocessor test
for __STDC__ being defined (to any value).
(_AC_C_C99_TEST_GLOBALS, _AC_C_C11_TEST_GLOBALS): Add preprocessor
test of the value of __STDC_VERSION__.
Diffstat (limited to 'lib/autoconf/c.m4')
| -rw-r--r-- | lib/autoconf/c.m4 | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4 index d4bed687..7984f25f 100644 --- a/lib/autoconf/c.m4 +++ b/lib/autoconf/c.m4 @@ -1143,6 +1143,13 @@ AC_DEFUN([_AC_C_C89_TEST_GLOBALS], [m4_divert_text([INIT_PREPARE], [[# Test code for whether the C compiler supports C89 (global declarations) ac_c_conftest_c89_globals=' +/* Does the compiler advertise C89 conformance? + Do not test the value of __STDC__, because some compilers set it to 0 + while being otherwise adequately conformant. */ +#if !defined __STDC__ +# error "Compiler does not advertise C89 conformance" +#endif + #include <stddef.h> #include <stdarg.h> struct stat; @@ -1198,6 +1205,11 @@ AC_DEFUN([_AC_C_C99_TEST_GLOBALS], [m4_divert_text([INIT_PREPARE], [[# Test code for whether the C compiler supports C99 (global declarations) ac_c_conftest_c99_globals=' +// Does the compiler advertise C99 conformance? +#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 199901L +# error "Compiler does not advertise C99 conformance" +#endif + #include <stdbool.h> extern int puts (const char *); extern int printf (const char *, ...); @@ -1345,6 +1357,11 @@ AC_DEFUN([_AC_C_C11_TEST_GLOBALS], [m4_divert_text([INIT_PREPARE], [[# Test code for whether the C compiler supports C11 (global declarations) ac_c_conftest_c11_globals=' +// Does the compiler advertise C11 conformance? +#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112L +# error "Compiler does not advertise C11 conformance" +#endif + // Check _Alignas. char _Alignas (double) aligned_as_double; char _Alignas (0) no_special_alignment; |