git: cf97d2a1dab8 - main - Build lib/msun tests with compiler builtins disabled

[Dimitry Andric]

The branch main has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=cf97d2a1dab8f2cddc4466fe64d37818339c73be

commit cf97d2a1dab8f2cddc4466fe64d37818339c73be
Author:     Dimitry Andric <dim at FreeBSD.org>
AuthorDate: 2021-02-23 20:03:32 +0000
Commit:     Dimitry Andric <dim at FreeBSD.org>
CommitDate: 2021-02-23 20:10:01 +0000

    Build lib/msun tests with compiler builtins disabled
    
    This forces the compiler to emit calls to libm functions, instead of
    possibly substituting pre-calculated results at compile time, which
    should help to actually test those functions.
    
    Reviewed by:    emaste, arichardson, ngie
    Differential Revision: https://reviews.freebsd.org/D28577
    MFC after:      3 days
---
 lib/msun/tests/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/msun/tests/Makefile b/lib/msun/tests/Makefile
index d58333271e9b..85a558bb0733 100644
--- a/lib/msun/tests/Makefile
+++ b/lib/msun/tests/Makefile
@@ -19,6 +19,10 @@ CFLAGS+=	-I${TESTSRC:H}/libc/gen
 CFLAGS+=	-D__HAVE_LONG_DOUBLE
 .endif
 
+# Avoid builtins, to force the compiler to emit calls to the libm
+# functions, and not calculate any results in advance.
+CFLAGS+=        -fno-builtin
+
 NETBSD_ATF_TESTS_C=	acos_test
 NETBSD_ATF_TESTS_C+=	asin_test
 NETBSD_ATF_TESTS_C+=	atan_test