Hi
GNU autotools went more than 20 years forward
from the old C89/c90 compatibility checks to C11 and C99 before C89/C90.
First try is with compiler default settings, next try is with "-std=gnu11".
tcc fail with both, but using CFLAGS="-std=c11"
works for the first check (__STDC_VERSION__)
Next check is _Alignas. tcc is broken, but i commited a fix
The current test is strange. It has a failure message
and only works with tcc.
tcc -m32 and tcc -m64 have the same results as gcc -m64 (1 1 1 1),
but the result with gcc -m32 is different: 1 0 1 1
What should we do?
Attached are a patch for the additional tests to verify my
implementation changes for _Alignas.
--
Bye bye ... Detlef
From edb7f281c4a44654de6984bf35a3e1515865a1c0 Mon Sep 17 00:00:00 2001
From: Detlef Riekenberg <wine....@web.de>
Date: Thu, 28 Jul 2022 18:39:56 +0200
Subject: [PATCH 1/1] Tests for _Alignas(0), _Alignas(1) and more
Used by newer configure scripts from GNU autotools
--
bye bye, Detlef
---
tests/tests2/102_alignas.c | 12 ++++++++++++
tests/tests2/102_alignas.expect | 1 +
2 files changed, 13 insertions(+)
diff --git a/tests/tests2/102_alignas.c b/tests/tests2/102_alignas.c
index 62d3ed2..bd8dabe 100644
--- a/tests/tests2/102_alignas.c
+++ b/tests/tests2/102_alignas.c
@@ -14,6 +14,13 @@ int16aligned_t i7;
corresponding attribute _does_ apply to type-name, though not in
some clang versions. */
int _Alignas(int __attribute__((aligned(16)))) i8;
+char _Alignas (0) c0;
+char _Alignas (1) c1;
+char _Alignas (2) c2;
+char _Alignas (short) cs;
+char _Alignas (float) cf;
+char _Alignas (0) _Alignas (long) two;
+
extern int printf(const char*, ...);
#ifdef _MSC_VER
#define alignof(x) (int)__alignof(x)
@@ -25,5 +32,10 @@ int main()
printf("%d %d %d %d\n",
alignof(i1) == 16, alignof(i4) == alignof(double),
alignof(i5) == alignof(int) , alignof(i8) == 16);
+ printf("%d %d %d %d %d %d\n",
+ alignof(c0) == 1, alignof(c1) == 1, alignof(c2) == 2 ,
+ alignof(cs) == alignof(short), alignof(cf) == alignof(float),
+ alignof(two) == alignof(long));
+
return 0;
}
diff --git a/tests/tests2/102_alignas.expect b/tests/tests2/102_alignas.expect
index b458e07..697ea5d 100644
--- a/tests/tests2/102_alignas.expect
+++ b/tests/tests2/102_alignas.expect
@@ -1,2 +1,3 @@
102_alignas.c:4: warning: type defaults to int
1 1 1 1
+1 1 1 1 1 1
--
2.34.1
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