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Building the testsuite with GCC mainline fails with: bug-strspn1.c: In function 'main': bug-strspn1.c:14:3: error: right-hand operand of comma expression has no effect [-Werror=unused-value] strspn (b++, ""); ^~~~~~~~~~~~~~~~ and a similar error for bug-strpbrk1.c. I'm not sure what GCC change introduced this, and the wording of the message is a bit off (in the source it's not a comma expression, that must reflect GCC's IR). But the warning is correct (strspn is a pure function, the call is useless, and if there wasn't an argument with a side effect much older GCC would have warned); the point of the test is to verify that the side effect in an argument still occurs for this useless call that can otherwise be optimized to an (unused) constant (testing for a bug there once was in an old strspn macro). This patch duly arranges for the warning to be disabled for this code. Tested with build-many-glibcs.py for aarch64-linux-gnu. * string/bug-strpbrk1.c: Include <libc-diag.h>. (main): Disable -Wunused-value around call to strpbrk. * string/bug-strspn1.c: Include <libc-diag.h>. (main): Disable -Wunused-value around call to strspn.
28 lines
684 B
C
28 lines
684 B
C
/* Test case by Joseph S. Myers <jsm28@cam.ac.uk>. */
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#undef __USE_STRING_INLINES
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#define __USE_STRING_INLINES
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <libc-diag.h>
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int
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main (void)
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{
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const char *a = "abc";
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const char *b = a;
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DIAG_PUSH_NEEDS_COMMENT;
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/* GCC 9 correctly warns that this call to strpbrk is useless. That
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is deliberate; this test is verifying that a side effect in an
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argument still occurs when the call itself is useless and could
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be optimized to return a constant. */
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DIAG_IGNORE_NEEDS_COMMENT (9, "-Wunused-value");
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strpbrk (b++, "");
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DIAG_POP_NEEDS_COMMENT;
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if (b != a + 1)
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return 1;
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return 0;
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}
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