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libiberty: Fix build with GCC < 7

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Tobias reported on IRC that the linker fails to build with GCC 4.8.5.
In configure I've tried to use everything actually used in the sha1.c
x86 hw implementation, but unfortunately I forgot about implicit function
declarations.  GCC before 7 did have <cpuid.h> header and bit_SHA define
and __get_cpuid function defined inline, but it didn't define
__get_cpuid_count, which compiled fine (and the configure test is
intentionally compile time only) due to implicit function declaration,
but then failed to link when linking the linker, because
__get_cpuid_count wasn't defined anywhere.

The following patch fixes that by using what autoconf uses in AC_CHECK_DECL
to make sure the functions are declared.

2023-12-05  Jakub Jelinek  <jakub@redhat.com>

	* configure.ac (HAVE_X86_SHA1_HW_SUPPORT): Verify __get_cpuid and
	__get_cpuid_count are not implicitly declared.
	* configure: Regenerated.
This commit is contained in:
Jakub Jelinek 2023-12-05 23:32:19 +01:00
parent b8cf266f4c
commit c73cc6fe62
2 changed files with 4 additions and 0 deletions
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2
libiberty/configure vendored
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@ -7667,6 +7667,8 @@ void foo (__m128i *buf, unsigned int e, __m128i msg0, __m128i msg1)
int bar (void)
{
unsigned int eax, ebx, ecx, edx;
(void) __get_cpuid;
(void) __get_cpuid_count;
if (__get_cpuid_count (7, 0, &eax, &ebx, &ecx, &edx)
&& (ebx & bit_SHA) != 0
&& __get_cpuid (1, &eax, &ebx, &ecx, &edx)

2
libiberty/configure.ac
View File

@ -771,6 +771,8 @@ void foo (__m128i *buf, unsigned int e, __m128i msg0, __m128i msg1)
int bar (void)
{
unsigned int eax, ebx, ecx, edx;
(void) __get_cpuid;
(void) __get_cpuid_count;
if (__get_cpuid_count (7, 0, &eax, &ebx, &ecx, &edx)
&& (ebx & bit_SHA) != 0
&& __get_cpuid (1, &eax, &ebx, &ecx, &edx)