[M] Change in flashrom[master]: tests: Undefine _FORTIFY_SOURCE for unit tests to avoid _chk variants

[Anastasia Klimchuk (Code Review)]

Anastasia Klimchuk has submitted this change. ( https://review.coreboot.org/c/flashrom/+/68432 )

(

5 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: tests: Undefine _FORTIFY_SOURCE for unit tests to avoid _chk variants
......................................................................

tests: Undefine _FORTIFY_SOURCE for unit tests to avoid _chk variants

The option _FORTIFY_SOURCE, when enabled, can result in some functions
being expanded into _chk variants. For example, `fprintf` can get
expanded into `__fprintf_chk`. This makes sense for building a real
binary, but is not needed for unit tests.

In unit test environment all those functions are wrapped. In the
example above, both `fprintf` and `__fprintf_chk` needed to be mocked.
Disabling _FORTIFY_SOURCE avoids expanding functions into _chk
variants, without any loss of testing coverage because that would
be wrapped/mocked anyway.

This patch also removes two existing _chk wraps because they are not
needed anymore.

BUG=b:237606255
TEST=ninja test on
1) gcc 12.2.0 on Debian
2) clang 15.0 on Chromium OS

Ticket: https://ticket.coreboot.org/issues/411
Change-Id: I70cb1cd90d1f377ff4606acad3c1b514120ae4f7
Signed-off-by: Anastasia Klimchuk 
Reviewed-on: https://review.coreboot.org/c/flashrom/+/68432
Reviewed-by: Peter Marheine 
Reviewed-by: Felix Singer 
Tested-by: build bot (Jenkins) 
---
M tests/meson.build
M tests/tests.c
2 files changed, 35 insertions(+), 18 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Felix Singer: Looks good to me, approved
  Peter Marheine: Looks good to me, but someone else must approve

diff --git a/tests/meson.build b/tests/meson.build
index b0375a1..66adb92 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -69,9 +69,7 @@
   '-Wl,--wrap=fsync',
   '-Wl,--wrap=fread',
   '-Wl,--wrap=fgets',
-  '-Wl,--wrap=__fgets_chk',
   '-Wl,--wrap=fprintf',
-  '-Wl,--wrap=__vfprintf_chk',
   '-Wl,--wrap=fclose',
   '-Wl,--wrap=feof',
   '-Wl,--wrap=ferror',
@@ -115,6 +113,7 @@
     cargs,
     '-ffunction-sections',
     '-fdata-sections',
+    '-U_FORTIFY_SOURCE',
   ],
   export_dynamic : true,
   link_args : mocks,
diff --git a/tests/tests.c b/tests/tests.c
index 53bad65..77cb1ef 100644
--- a/tests/tests.c
+++ b/tests/tests.c
@@ -222,14 +222,6 @@
    return NULL;
 }

-char *__wrap___fgets_chk(char *buf, int len, FILE *fp)
-{
-	LOG_ME;
-	if (get_io() && get_io()->fgets)
-		return get_io()->fgets(get_io()->state, buf, len, fp);
-	return NULL;
-}
-
 size_t __wrap_fread(void *ptr, size_t size, size_t nmemb, FILE *fp)
 {
    LOG_ME;
@@ -282,14 +274,6 @@
    return 0;
 }

-int __wrap___vfprintf_chk(FILE *fp, const char *fmt, va_list args)
-{
-	LOG_ME;
-	if (get_io() && get_io()->fprintf)
-		return get_io()->fprintf(get_io()->state, fp, fmt, args);
-	return 0;
-}
-
 int __wrap_fclose(FILE *fp)
 {
    LOG_ME;