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[Bug 1001934] New: gcc 4.6.3-20120623 optimizes wrong
- From: bugzilla-daemon at bugs dot ecos dot sourceware dot org
- To: unassigned at bugs dot ecos dot sourceware dot org
- Date: Wed, 29 Jan 2014 09:54:35 +0000
- Subject: [Bug 1001934] New: gcc 4.6.3-20120623 optimizes wrong
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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001934
Bug ID: 1001934
Summary: gcc 4.6.3-20120623 optimizes wrong
Product: eCos
Version: CVS
Target: at91 (Atmel evaluation board (EB40))
Architecture/Host HostOS: Linux
OS:
Status: UNCONFIRMED
Severity: critical
Priority: low
Component: Gnutools
Assignee: unassigned@bugs.ecos.sourceware.org
Reporter: J.Lambrecht@televic.com
arm-eabi-gcc (eCos GNU Tools 4.6.3-20120623) 4.6.3 contains a bug: it optimizes
too much in televic-application-code.c (see comment in code):
static TLV_CHAR szConfigVersion[MAX_TOKLEN + 1U];
static TLV_CHAR szConfigArtNr[MAX_TOKLEN + 1U];
TLV_U32 TeLeVic_function(TLV_CHAR *p_String)
{
TLV_CHAR attribute[MAX_TOKLEN + 1U];
TLV_CHAR value[MAX_TOKLEN + 1U];
TLV_S32 s32_valueInt;
szConfigVersion[0] = 0;
szConfigArtNr[0] = 0;
...
if (...)
{
...
}
else
{
while (GetAttribute(attribute, &s32_valueInt, value) == TOK_ATTRIBUTE)
{
if (strcmp(attribute, "version") == 0)
{
strncpy(szConfigVersion, value, sizeof(szConfigVersion));
szConfigVersion[sizeof(szConfigVersion)] = 0;
/* In this printf szConfigVersion is correct:
printf("value=%s, szConfigVersion=%s\n", value, szConfigVersion); */
}
else if (strcmp(attribute, "artnr") == 0)
{
strncpy(szConfigArtNr, value, sizeof(szConfigArtNr));
szConfigArtNr[sizeof(szConfigArtNr)] = 0;
/* WARNING: in this printf szConfigVersion is 0 with the eabi compiler; with
the
elf compiler it is OK!!!
printf("value=%s, szConfigVersion=%s\n", value, szConfigVersion); */
}
}
Enter();
}
-------------------------------------------
So identically the same code (application+ecos) compiled with arm-elf-gcc (GCC)
3.2.1 (eCosCentric) works fine.
With or without printf's, the result is the same.
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