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Consistently use block comments at beginning of C99 and C11 tests

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Purely cosmetic improvement to the C standard version tests: Use /* */
comments above all three checks of __STDC__ and/or __STDC_VERSION__,
and make “// See if C++-style comments work” the very first // comment.

Resolves issue #110713.

* c.m4 (_AC_C_C99_TEST_GLOBALS, _AC_C_C11_TEST_GLOBALS):
  Improve stylistic consistency with _AC_C_C89_TEST_GLOBALS.
  Move explicit test of C++-style comments earlier.
This commit is contained in:
Detlef Riekenberg 2022-09-04 01:57:25 +02:00 committed by Zack Weinberg
parent 185d1db28b
commit ba719bedba
1 changed files with 4 additions and 3 deletions
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lib/autoconf/c.m4
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@ -1193,11 +1193,13 @@ 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?
/* Does the compiler advertise C99 conformance? */
#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 199901L
# error "Compiler does not advertise C99 conformance"
#endif
// See if C++-style comments work.
#include <stdbool.h>
extern int puts (const char *);
extern int printf (const char *, ...);
@ -1253,7 +1255,6 @@ typedef const char *ccp;
static inline int
test_restrict (ccp restrict text)
{
// See if C++-style comments work.
// Iterate through items via the restricted pointer.
// Also check for declarations in for loops.
for (unsigned int i = 0; *(text+i) != '\''\0'\''; ++i)
@ -1348,7 +1349,7 @@ 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?
/* Does the compiler advertise C11 conformance? */
#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112L
# error "Compiler does not advertise C11 conformance"
#endif